Volume 3 Issue 1

CONTENT LIST

  1. Weed competitiveness of winter rice (Oryza sativa L.) under modified aerobic system
  2. Interactive effects of soil salinity and water table depth on soil properties and sorghum (Sorghum bicolor L. Moench) production
  3. Effects of mulching on growth and yield components of selected varieties of wheat (Triticum aestivum L.) under field condition
  4. Impact of jute retting on physicochemical profile of Chhariganga oxbow lake in Nadia district, West Bengal, India
  5. Identification of terrestrial gastropods species in Sohag Governorate, Egypt
  6. Influence of plant nutrient management on the yield performance of transplant Aman rice (Oryza sativa L.)
  7. Water quality of River Ganga with reference to physico-chemical and microbiological characteristics during Kanwar Mela 2017, at Haridwar, India: A case study
  8. Effectiveness of different plant extracts against Galleria mellonella larvae in laboratory
  9. Growth analysis of short duration transplant Aus rice (Oryza sativa L. cv. Parija) under irrigated ecosystem
  10. Health risk assessment of heavy metals via dietary intake of vegetables grown in wastewater irrigated areas of Jagjeetpur, Haridwar India
  11. Assessment of heavy metals pollution in surface sediments of a tidal creek in the Niger Delta, Nigeria
  12. Effects of rotation of cotton (Gossypium hirsutum L.) and soybean [Glycine max (L.) Merr.] crops on soil fertility in Elizabeth, Mississippi, USA
  13. Influence of sowing date on the growth and yield performance of wheat (Triticum aestivum L.) varieties
  14. Heavy metals and major nutrients accumulation pattern in spinach grown in farm and industrial contaminated soils and health risk assessment

Weed competitiveness of winter rice (Oryza sativa L.) under modified aerobic system

Md. Altamas Arefin1, Md. Rashedur Rahman2, A.N.M. Atikur Rahman1, A.K.M. Mominul Islam1 and Md. Parvez Anwar1*
1Weed Management Laboratory, Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, BANGLADESH
2Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, BANGLADESH
*Corresponding author’s E-mail: [email protected]
Received: 18 January 2018; Revised received: 14 February 2018; Accepted: 25 February 2018

ABSTRACT
The study was conducted during winter season (February-June) of 2016 at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh. Fourteen rice varieties namely, BRRI dhan28,  BRRI dhan29, BRRI dhan47, BRRI dhan50, BRRI dhan55, BRRI dhan58, BRRI dhan59, BRRI dhan67, Binadhan-5, Binadhan-6, Binadhan-8, Binadhan-10, BRRI hybriddhan3 and Agrodhan14 were grown under weedy and weed- free conditions. Plots with no rice were also maintained to study the natural growth of weed in absence of rice. Primed rice seeds were dry seeded following 25 cm ×15 cm spacing with 5 seeds hill-1 on non-puddled soil. Plots were surface irrigated as and when necessary to maintain aerobic condition (at around field capacity) up to heading stage followed by wet condition from heading to grain filling stage. The results revealed that rice varieties varied widely in yield performance and weed suppressive ability. Among varieties, BRRI dhan59 allowed the minimum weed growth (20.8 g m-2) while Binadhan-5 allowed the maximum weed growth (65.8 g m-2). Grain yield ranged from 2.2 t ha-1 (BRRI dhan55) to 4.67 t ha-1 (Binadhan-5) under weed-free condition and from 0.62 t ha-1 (BRRI dhan55) to 2.48 t ha-1 (BRRI dhan59) under weedy condition. Weed infected relative yield loss ranged from 40.1% to 78.2% among varieties. BRRI dhan59 incurred the least yield penalty (40.1%) while Binadhan-5 performed the best in terms of grain yield (4.67 t ha-1) but its weed inflicted relative yield loss was higher (76.4%) than any other variety with low yield potential. BRRI dhan59, on the other hand, appeared as the most weed competitive variety (only 40.1% relative yield loss) with yield of 4.19 t ha-1. Present study confirms that the varieties tested under study varied widely in terms of weed suppressive ability and yield performance. Considering both yield and weed competitiveness, BRRI dhan59 can be recommended for cultivation following modified aerobic system.

Keywords: Aerobic soil, Direct seeded rice, Early vigor, Relative yield loss, Weed suppression, Yield performance

Interactive effects of soil salinity and water table depth on soil properties and sorghum (Sorghum bicolor L. Moench) production

Taia A. Abd El-Mageed1*, Saad A. Mohammed1, Ibrahim M. El-Samnoudi1 and Abd El-Aty M. Ibrahirm1
 1Soil and Water Department, Faculty of Agriculture, Fayoum University, 63514-Fayoum, EGYPT
*Corresponding author’s E-mail: [email protected]
Received: 17 December 2017; Revised received: 05 February 2018; Accepted: 20 February 2018 

ABSTRACT
Soil salinity and water table are the most prevalent and widespread problems limiting crop productivity in irrigated agriculture. Our experiment aims to evaluate the effect of soil salinity and water table on some soil properties, growth, and yield of sorghum (variety Giza 15) grown along two successive seasons. Nine different sites were chosen, representing three levels of soil salinity (i.e. ECe < 4, 4-8 and 8-16 dS m-1). For each salinity level three water table were selected (i.e. shallow ≈ 55 cm, medium ≈ 80 cm and deep ≈ 120 cm). Results revealed that there are main considerable effects of salinity and water table on some soil properties. Increasing of salinity caused significant decreases in plant growth, weight of 1000 grains (g), protein content% and  seed yield (t/ha) which decreased by 36.98%, 32.27%, 20.45%, 29.95 % and 57.46% respectively, when salinity increased from S1  to S3. On the other hand, decreasing of water table lead to improvement in all mentioned soil properties and plant growth. The results indicated that need to maintain low or moderate salinity and deep water table, which is essential for producing high sorghum grain yield with satisfactory quality.

Keywords: Salt stress, Waterlogging, Soil physical properties, Growth, Sorghum bicolor L. Moench, Yield and yield quality

Effects of mulching on growth and yield components of selected varieties of wheat (Triticum aestivum L.) under field condition

Akter1, U.K. Sarker1, A.K. Hasan1, M.R. Uddin1*, M.M.I. Hoque2 and C.K. Mahapatra3
1Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, BANGLADESH
2ACI Limited, Dhaka, BANGLADESH 3Upazila Agriculture Officer, Kendua, Netrakona, BANGLADESH
*Corresponding author’s E-mail: [email protected]
Received: 20 January 2018; Revised received: 11 February 2018; Accepted: 20 February 2018

ABSTRACT
Wheat is facing increased high temperature during its grain filling period in Bangladesh which reduces yield drastically. Mulching may help to mitigate this problem. Therefore, a field experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from November 2015 to March 2016 to find out growth and yield performance of wheat as influenced by mulching. The experiment comprised of two factors viz., variety and mulching. The variety comprised of BARI Gom-26, BARI Gom-27 and BARI Gom-28. Mulching comprised of four different levels of treatments viz.no mulch + no irrigation (control), water hyacinth mulch + no irrigation, rice straw mulch + no irrigation and two irrigations at CRI and flowering stage. The experiment was laid out in a randomized complete block design with three replications. BARI Gom-28 showed the highest values in growth parameters (plant height, number of total tillers hill-1, LAI, chlorophyll content and total dry matter) at 30, 45 and 60 DAS. On the other hand, when mulching was compared, rice straw mulch gave higher yield compared to other treatments at 30, 45 and 60 DAS. The interaction effect of variety and mulching showed significant in relation to yield and yield components except plant height, spike length, 1000- grain weight and harvest index (%). The tallest plant (93.20 cm) was obtained from the interaction of BARI Gom-28 and rice straw mulch. The highest number of total tillers hill-1 (4.80), number of effective tillers hill-1 (4.57), spike length (10.23), number of spikelets spike-1 (21.15), 1000-grain weight (48.54 g), grain yield (5.20 t ha-1), straw yield (7.27 t ha-1), and harvest index (41.71%) were obtained from the interaction of BARI Gom-28 and rice straw mulch. The lowest grain yield was obtained from BARI Gom-26 and control (no mulch + no irrigation). It may be concluded from the results of the study that, BARI Gom-28 with rice straw mulching treatment can be used for successful cultivation of wheat.

Keywords: Harvest index, Leaf area index, Mulching, Total dry matter, Wheat varieties, Yield components

Impact of jute retting on physicochemical profile of Chhariganga oxbow lake in Nadia district, West Bengal, India

Dipankar Ghosh1 and Jayanta Kumar Biswas1, 2*
Department of Ecological Studies, University of Kalyani, Kalyani-741235, (West Bengal), INDIA
2International Centre for Ecological Engineering, Department of Ecological Studies, University of Kalyani, Kalyani-741235, (West Bengal), INDIA
*Corresponding author’s E-mail: [email protected]
Received: 16 January 2018; Revised received: 31 January 2018; Accepted: 19 February 2018

ABSTRACT
The present study was carried out to assess the ecosystem of the Chhariganga, an oxbow lake in eastern India to assess the pollution due to jute retting and trophic status on broader aspects for its sustainable management. The physicochemical analyses of the studied oxbow lake showed the range with annual mean values of surface water temperature in ºC (11-37, 27.64±6.56), water transparency in cm (16-106, 45.82±23.39), water pH (7.4-8.8, 8.17±0.34), DO (2.60-7.85, 4.65±1.52 ppm), BOD (1.10-6.40, 2.98±1.59ppm), COD (70-90, 79±7.38ppm), NH4-N (0.026-0.093, 0.05±0.02ppm), NO2-N (0.008-0.08, 0.03±0.02ppm), NO3-N (0-2.459, 0.81±0.69ppm), OP (0.067-0.62, 0.26±0.18ppm), total alkalinity (82-165, 120±24.03ppm), total hardness (70-138, 102.62±19.60ppm), GPP (0.30-1.80, 1.25± 0.47mgC/l/day), NPP (0.15-1.38, 0.95± 0.40mgC/l/day); sediment pH (6.8-7.9, 7.53±0.34) and sediment organic carbon in % (1.87-2.89, 2.17±0.28). The highest mean values of BOD (4.59ppm), COD (86.67ppm), OP (0.50ppm), sediment organic carbon (2.29%) were observed during monsoon whereas the lowest values of oxbow lake water’s transparency (27.00cm), pH (7.84), DO (3.63ppm) and NO2–N (0.01 ppm) contents were found during monsoon when jute retting process intensified in the oxbow lake. Compared to their values in pre-monsoon, mean values in monsoon showed an increase in BOD (182.57%) and OP content (167.64%) unlike reduction in water transparency (62.54%), GPP and NPP (both reduced by about 50%); The highest concentration of NH4-N and NO3-N were noticed during post-monsoon and OP during monsoon. The water transparency mean values showed sharp fall during monsoon from pre-monsoon. Physico-chemical analyses revealed that almost all parameters in oxbow lake did not show significant changes throughout the year unlike water transparency, BOD, NO2 and especially OP content of water which otherwise showed significant changes throughout the year.  The present semi-closed oxbow lake water was of poor to moderate quality and it was classified as oligo-mesotrophic in nutrient status with high to moderate organic pollution due to jute retting process which needs to be controlled and regulated for sustainable aquaculture in oxbow lake ecosystem.

Keywords: Gross primary productivity (GPP), Jute retting, Net primary productivity (NPP), Oxbow lake, Physico-chemical properties, Water quality

Identification of terrestrial gastropods species in Sohag Governorate, Egypt

Abd El-Aleem Saad Soliman Desoky
Department of Plant protection (Agriculture Zoology), Faculty of Agriculture, Sohag University, EGYPT
E-mail: [email protected]
Received: 15 January 2018; Revised received: 10 February 2018; Accepted: 21 February 2018

ABSTRACT
The study aims to identify of terrestrial gastropods species in Sohag Governorate during the year 2016 and 2017. The present study was carried out for survey and identification for random land snail in 11 districts, i.e. (Tema, Tahta, Gehyena, El-Maragha, Saqultah, Sohag, Akhmim, El-Monshah, Gerga, El-Balyana, and Dar El-Salam) at Sohag Governorate, Egypt. Samples were collected from 5 different locations in each district during 2016-2017 seasons. The monthly samples were taken from winter and summer crops (areas were cultivated with the field crops such as wheat, Egyptian clover, and vegetables crops. The results showed that found two species of land snails, Monacha obstracta (Montagu) and Eobania vermiculata (Muller). It was also observed that the occurrence of the spread of land snails was increased from the previous periods. The results further indicated that land snails were recorded in Sohag for a second time more widespread and may be that this pest moved to these governorates with transportation, passengers from places spread these new places and happened to her adaptation and after have transferred from infestation regions so, have adapted under weather factors of new region also, several factors e.g., the presence of more preferable food, shelter, intra-specific competition, fecundity increasing, several hosts or habitat in the new ecosystems. Therefore, this study gives an interesting indication of the development of a plan in effective strategy for land snail’s management program in agro ecosystems in Upper Egypt.

Keywords: Egypt, Eobania vermiculata, Land snails, Monacha obstracta, Terrestrial gastropods

Influence of plant nutrient management on the yield performance of transplant Aman rice (Oryza sativa L.)

Md. Imran Ali, Md. Abdur Rahman Sarkar and Swapan Kumar Paul*
Department of Agronomy, Bangladesh Agricultural University, Mymensigh-2202, BANGLADESH
*Corresponding author’s E-mail: [email protected]
Received: 21 January 2018; Revised received: 27 January 2018; Accepted: 18 February 2018

ABSTRACT
The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, Bangladesh during June to December 2016 to investigate the influence of plant nutrient management on the yield performance of transplant Aman rice varieties. The experiment comprised four varieties viz., BRRIdhan70, BRRI dhan71, BRRI dhan72 and BRRIdhan73 and six nutrient managements viz. poultry manure 5 t ha-1, recommended dose of prilled urea, P, K, S, Zn (160, 65, 90, 70, 10 kg ha-1  of urea, TSP, MoP, Gypsum and Zinc sulphate, respectively), 75% of recommended dose of prilled urea and P, K, S, Zn + poultry manure 2.5 t ha-1, 50% of recommended dose of prilled urea and P, K, S, Zn + poultry manure 5 t ha-1, USG 1.8 g/4 hills and P, K, S, Zn recommended dose, USG 1.8 g/4 hills and P, K, S, Zn + poultry manure 2.5 t ha-1. The experiment was laid out in a randomized complete block design with three replications. Number of total tillers hill-1 (10.25), number of effective tillers hill-1(8.85), grains panicle-1 (94.23), 1000-grain weight (27.81), grain yield (5.88 t ha-1) and straw yield (8.83 t ha-1) were found to be the highest in BRRI dhan72. Among the nutrient management, USG 1.8 g/4 hills and P, K, S, Zn + poultry manure 2.5 t ha-1 exhibited its superiority  to other treatments in terms of plant height (131.0 cm), number of total tillers hill-1 (10.67), number of effective tillers hill-1 (9.13), grains panicle-1 (92.71), 1000-grain weight (26.82), grain yield (6.0 t ha-1) and straw yield (8.35 t ha-1). The highest grain yield (6.45 t ha-1) was found in BRRI dhan72 combined with USG 1.8 g/4 hills and P, K, S, Zn + poultry manure 2.5 t ha-1 and the lowest grain yield (4.85 t ha-1) was found in BRRI dhan71 fertilized with poultry manure 5 t ha-1. From the study, it can be concluded that transplant Aman rice cv. BRRI dhan72 fertilized with USG 1.8 g/4 hills and P, K, S, Zn + poultry manure 2.5 t ha-1 appears as the promising practice to obtain the highest grain yield.

Keywords: Nutrient management, Plant nutrient management, Transplant Aman rice, Variety, Yield

Water quality of River Ganga with reference to physico-chemical and microbiological characteristics during Kanwar Mela 2017, at Haridwar, India: A case study

Vinod Kumar1*, Sanjay Kumar2, Sachin Srivastava3, Jogendra Singh1 and Pankaj Kumar1
1Department of Zoology and Environmental Science, 2Department of Botany and Microbiology, Faculty of Life Sciences, Gurukula Kangri Vishwavidyalaya Haridwar-249404 (Uttrakhand), INDIA
3Department of Agriculture and Forestry, Roorkee Institute of Technology, Roorkee-247667 (Uttarakhand), INDIA           
*Corresponding author’s E-mail: [email protected]
Received: 22 December 2017; Revised received: 18 February 018; Accepted: 25 February 2018

ABSTRACT
The present investigation was conducted to study the water quality of river Ganga during Kanwar Mela 2017 with reference to physico-chemical and microbiological characteristics at Haridwar city. Five sampling sites viz., Har ki Pauri (HKP), Vishnu Ghat (VG), Daksh Mandir (DM), Pul Jatwara (PJ) and Bhimgoda Barrage (BGB as control) were selected for collection of water samples. The reseult revealed that among the different sampling sites, the maximum values of EC (0.164 dS m-1), TS (545 mg L-1), TDS (320 mg L-1), TSS (225 mg L-1), pH (8.76), DO (10.04 mg L-1), BOD (4.76 mg L-1), COD (6.89 mg L-1), Cl(124.50 mg L-1), Hardness (232.54 mg L-1), Alkalinity (158.36 mg L-1), NO32- (76.88 mg L-1), SO42- (228.34 mg L-1), SPC (6.8×106 SPC ml -1), MPN (4.6×108  MPN 100 ml -1), Cd (BDL), Cu (0.171 mg L-1), Cr (1.503 mg L-1), Fe (3.642 mg L-1), Ni (BDL) and Zn (2.456 mg L-1) of Ganga River water were recorded higer at Har ki Pauri (HKP) in comparison to Vishnu Ghat (VG), Daksh Mandir (DM), Pul Jatwara (PJ) and Bhimgoda Barrage (BGB) sampling sites. Therefore, it was concluded from the present investigation that the mass bathing and relegious activities greatly influenced the water quality of River Ganga and significantly contributed to the water pollution of River Ganga during the Kanwar Mela 2017.

Keywords: Ganga river, Heavy metals, Kanwar Mela, Microbiological parameters, Water quality

Effectiveness of different plant extracts against Galleria mellonella larvae in laboratory

Lalita, Yogesh Kumar and Sunita Yadav
Department of Entomology, CCS Haryana Agricultural University, Hisar 125004, (Haryana), INDIA
*Corresponding author’s E-mail: [email protected]
Received: 26 December 2017; Revised received: 21 February 2018; Accepted: 26 February 2018

ABSTRACT
The present investigation was undertaken to study the effectiveness of different plant extracts against Galleria mellonella larvae in laboratory. Acetone prepared extracts of leaves, stem, seed, root, husk of thirteen medicinal and healthy plants were used to examine their effects on the mortality of the greater wax moth Galleria mellonella larvae in laboratory.  Results revealed that only six plant extracts prepared with leaves and stem cause mortality of wax moth. Larval mortality was highest (93.33%) with husk prepared extract of P. psyllium followed by leaf prepared extract of H. sativum (80%), Raphanus sativus (73.33%), Linum usitatissimum (66.66%) Cucurbita moschata (46.66%) and Vicia sativa (46.66%). The larval mortality with stem/root/seed prepared extract was recorded highest in Hordeum sativum (73.33%) followed by Raphanus sativus (80%), Cucurbita moschata (60%)  Linum usitatissimum (53.33%) and Vicia sativa (40%) and found significant difference with the control (0.00%). There was no mortality of larvae was found in control and other remaining plant extract. Irrespective of the different plants, highest per cent mortality (52.22%) of wax moth larvae by stem/seed/ root prepared extract followed by leaf extract (48.66). Therefore, the plant extract of different plants were found effective against Galleria mellonella larvae.

Keywords: Galleria mellonella, Honeybees, Larval mortality, Plant extracts, Wax moth

Growth analysis of short duration transplant Aus rice (Oryza sativa L. cv. Parija) under irrigated ecosystem

Bithi Roy and Swapan Kumar Paul*
Department of Agronomy, Bangladesh Agricultural University, Mymensigh-2202, BANGLADESH
*Corresponding author’s E-mail: [email protected]
Received: 01 February 2018; Revised received: 11 February 2018; Accepted: 26 February 2018

ABSTRACT
An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during April to July 2012 to examine the effect of plant spacing and nitrogen level on the growth performance of short duration transplant Aus rice (cv. Parija) under irrigated ecosystem. The experiment comprised four plants spacings viz., 20 cm × 20 cm, 20 cm × 15 cm, 20 cm × 10 cm and 15 cm × 15 cm and four nitrogen levels viz. 0, 35, 70 and 105 kg N ha-1. The experiment was laid out in a Randomized Complete Block Design with three replications. Morpho-physiological characters, of transplant Aus rice (cv. Parija) significantly influenced by spacing of planting, nitrogen level and their interaction. At 60 DAT, the highest plant height (80.68 cm) was obtained at 20 cm × 15 cm spacing fertilized with 70 kg N ha-1 which was as good as 20 cm × 10 cm fertilizad with 35 kg N ha-1.  The maximum number of tillers hill-1 (15.16) was obtained at 20 cm × 20 cm spacing fertilized with 105 kg N ha-1which was statistically at par with 20 cm × 15 cmfertilized with 70 kg N ha-1.  The highest total dry matter (8.92g) was obtained at the 20 cm × 15 cm spacing fertilized with higher dose of nitrogen (105 kg N ha-1) and at 45-60 DAT, the highest crop growth rate (3.34) was obtained at 15 cm × 15 cm spacing fertilized with 35 kg N ha-1 while the lowest CGR (1.12) was recorded at the same spacing (15 cm × 15 cm) with control treatment. This study revealed that short duration transplant Aus rice cv. Parija can be cultivated at 20 cm × 15 cm or 15 cm × 15 cm spacing with 35 to 105 kg N ha-1 for proper growth.

Keywords: Growth, Morpho-physiological characteristics, Nitrogen, Spacing, Transplant Aus rice

Health risk assessment of heavy metals via dietary intake of vegetables grown in wastewater irrigated areas of Jagjeetpur, Haridwar India

Vinod Kumar and Roushan K. Thakur*
Agro-ecology and Pollution Research Laboratory, Department of Zoology and Environmental Sciences, Gurukula Kangri Vishwavidyalyaya, Haridwar- 249404 (Uttarakhand), INDIA
*Corresponding author’s E-mail: [email protected]
Received: 12 December 2017; Revised received: 15 February 2018; Accepted: 20 February 2018

ABSTRACT
The present study was conducted to appraise the human health risk due to dietary intake of heavy metals contaminated vegetables viz., cabbage (Brassica oleracea var. capitata), cauliflower (Brassica oleracea var. botrytis) and spinach, (Spinacia oleracea) grown in the municipal wastewater irrigated soil in the proximity of sewage treatment plant (STP), Jagjeetpur, Haridwar. The results showed that Cd, Fe and Mn concentrations in B. oleracea var. capitata, B. oleracea var. botrytis and S. oleracea were found beyond the safe limit of the Indian and WHO/FAO standards for heavy metals in the vegetables. The contamination factor of these heavy metals in the soil was recorded in the order of Fe > Mn > Zn > Cu > Cr > Cd after irrigation of municipal wastewater. The higher values of metal pollution index in different vegetables as B. oleracea var. capitata (14.82; B. oleracea var. botrytis (10.48) and S. oleracea (12.59) showed more health risk index for Cd, Fe and Mn in these vegetables cultivated in the wastewater irrigated soil. Therefore, dietary intake of these heavy metals contaminated vegetables may pose a significant threat to the human health. However, cauliflower contained less heavy metal as compared to the cabbage and spinach, but health risk was more due to higher role in the diet. Even though there were low concentrations of heavy metals in the municipal wastewater used for the irrigation, but long term use of the municipal wastewater may cause gradual buildup of heavy metals in the vegetables grown in the municipal wastewater irrigated soil and leads to health risk of consumers due to intake of heavy metals contaminated vegetables.

Keywords: Dietary intake, Heavy metals, Human health risk, Soil, Vegetables, Wastewater

Assessment of heavy metals pollution in surface sediments of a tidal creek in the Niger Delta, Nigeria

Miebaka Moslen*, Ikem K.E. Ekweozor and Nsirim-Dimkpa Nwoka
Department of Animal and Environmental Biology, Rivers State University, Port Harcourt, NIGERIA
*Corresponding author’s E-mail: [email protected]  
Received: 17 January 2018; Revised received: 30 January 2018; Accepted: 19 February 2018

ABSTRACT
The present investigation was carried out to assess the heavy metals pollution in surface sediments of a tidal creek in the Niger Delta, Nigeria. Sediments obtained from Azuabie creek were examined for heavy metals viz., Cd, Cr, Pb and Zn pollution using the Okujagu creek as a control point. Three stations were established on the Azuabie creek while the control creek had one station. Sediments samples were collected in duplicates on a monthly basis for three months (October – December, 2015) and analyzed using atomic absorption spectrophotometry. Results show that Azuabie creek had higher metal concentrations compared to the control creek with mean metal values as follows Zn: 27.5 – 293.3 mg/kg; Cd: 0.0 – 0.6 mg/kg; Cr: 2.8 – 35.7 mg/kg and Pb:5.7 – 22.5 mg/kg. Zn levels in sediment had significant difference (p<0.05) between stations which occurred thus: St1 < St2 = St3 < St Control. The values of Contamination factor (CF) ranged from 0.00 – 3.1 indicating low to moderate level of sediment contamination. The values of the degree of contamination computed ranged from 1.28 at the control station to 5.98 at St.1 while the PLI values generally indicated “no pollution” except at St.3 where the values was slightly >1. Generally, EF and Igeo values were lowest at the control station compared to other stations. The study concluded there was low to moderate level of contamination indicating heavy metal input from anthropogenic origin was found in the study area.

Keywords: Heavy metal, Niger Delta, Risk Assessment, Sediment contamination

Effects of rotation of cotton (Gossypium hirsutum L.) and soybean [Glycine max (L.) Merr.] crops on soil fertility in Elizabeth, Mississippi, USA

H. Arnold Bruns*, Krishna Reddy and W.T. Pettigrew1
1Research Agronomist, Research Plant Physiologist and Research Plant Physiologist, Crop Production Systems Research Unit, Southeast Area- USDA-ARS, Stoneville, MS 38776, USA
*Corresponding author’s E-mail: [email protected]
Received: 18 February 2018; Revised received: 25 February 2018; Accepted: 28 February 2018

ABSTRACT
The effects of cotton (Gossypium hirsutum L.): soybean [Glycine max (L.) Merr.] rotation on the soil fertility levels are limited. An irrigated soybean: cotton rotation experiment was conducted from 2012 through 2015 near Elizabeth, Mississippi, USA. The crop rotation sequences were included continuous cotton (CCCC), continuous soybean (SSSS), cotton-soybean-cotton-soybean (CSCS), cotton-soybean-soybean-cotton (CSSC), soybean-cotton-cotton-soybean (SCCS), soybean-cotton-soybean-cotton (SCSC). The crop rotation sequences were followed continuous soybean, continuous cotton, cotton followed by soybean, soybean followed by cotton, soybean followed by two years of cotton, and cotton followed by two years of soybean. A weed control treatment of a non-glyphosate post-emergence vs. glyphosate post emergence was used in both crops. Soil samples taken prior to planting each year and in 2016 showed no differences in cation exchange capacity, organic matter, pH, or macro nutrient levels among the rotations, over the five sampling periods nor weed control methods used for either crop.

Keywords: Cotton (Gossypium hirsutum), Crop rotation, Soil characteristics, Soil fertility, Soybean (Glycine max)

Influence of sowing date on the growth and yield performance of wheat (Triticum aestivum L.) varieties

Utpal Madhu, Mahfuza Begum, Abdus Salam and Shubroto Kumar Sarkar*
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, BANGLADESH
*Corresponding author’s E-mail: [email protected]
Received: 18 February 2018; Revised received: 25 February 2018; Accepted: 28 February 2018

ABSTRACT
A field study was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to investigate the effect of sowing date on the performance of wheat varieties. The experiment, laid out in RCBD with three replications, comprised four sowing dates viz.,15 November, 30 November, 15 December and 30 December, and four varieties of wheat viz. BARI Gom 25, BARI Gom 26, BARI Gom 27 and Shatabdi. The results suggested that the highest plant population m-2 (58.17) and the highest plant height (89.59 cm) were obtained in 15 November sowing. BARI Gom 25 produced the highest plant population m-2 (50.33) and the highest plant height (86.32) while the same trend was observed in the interaction of BARI Gom 25×15 November sowing. The lowest performance of these two parameters was observed in the interaction of Shatabdi × 30 December sowing. The highest grain yield (2.18 ha-1) was found in the interaction of BARI Gom 25 × 15 November sowing as contributed by its highest number of effective tillers hill-1 (4.73), the highest number of spikelets spike-1 (17.77), the highest number of grains spike-1(37.89) and the highest 1000-grain weight (29.99g). The individual effect of the BARI Gom 25 and 15 November sowing on those parameters was also observed as the highest. The lowest grain yield (1.5 t ha-1) was found in the interaction of Shatabdi × 30 December sowing because of the poor performance of the yield components of this treatment combination. The variety BARI Gom 25 and BARI Gom 26 both gave better yield when sown on 15 November. Therefore, BARI Gom 25 and BARI Gom 26 should be sown on 15 November rather than late sowing to obtain better performance and grain yield of wheat.

Keywords: BARI Gom, Growth and yield performance, Harvest index, Sowing date, Wheat

Heavy metals and major nutrients accumulation pattern in spinach grown in farm and industrial contaminated soils and health risk assessment

H.M. Zakir1*, M.I.J. Aysha1, Supti Mallick1, Shaila Sharmin2, Q.F. Quadir1 and M.A. Hossain1
1Department of Agricultural Chemistry, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, BANGLADESH
2College of Agricultural Sciences, International University of Business Agriculture and Technology, Uttara Model Town, Dhaka-1230, BANGLADESH
*Corresponding author’s E-mail: [email protected]
 Received: 19 February 2018; Revised received: 26 February 2018; Accepted: 28 February 2018

ABSTRACT
A pot experiment was conducted to study heavy metals and major nutrients accumulation pattern and to assess possible health risk for adult male and female human through consumption of spinach grown in farm and industrial contaminated soils. The concentrations of Fe, Mn, Cu, Zn, Cr and Pb in aqueous extracts of leaves and roots were determined by an atomic absorption spectrophotometer (AAS). The present study revealed that spinach grown in both soils accumulated higher amount of Cr, which could pose potential health concern to the local residents. On the contrary, it could be a good source of S, Ca and Mg for adult male and female human. Accumulation of heavy metals and major nutrients in leaves of spinach was in the sequence of Fe > Zn > Cr > Mn > Cu > Pb and K > S > Ca > Mg > P, respectively for industrial contaminated soil, while the order was Fe > Mn > Cr > Zn > Cu > Pb and S > K > Ca > Mg ≥ P, respectively for farm soil. The sequence of Zn, Mn, Ca, K and S accumulation in spinach was leaf > root. But in case of Fe, Cr and P the order of accumulation pattern was reverse. Among the metals, the calculated THQ value for Cr surpassed 1, and the values for male were 2.85 and 6.86 and for female were 4.47 and 10.75 due to consumption of spinach grown in farm and industrial contaminated soils, respectively. The study results inferred that Cr health risk through consumption of spinach is unsafe in industrial contaminated sites; and in both places female is more vulnerable than male.

Keywords: Daily metals intakes, Health risk assessment, Industrial contaminated soils Major nutrients, Target hazard quotients (THQ), Uptake pattern