Nitrogen transformation and carbon sequestration in wetland paddy field of Bangladesh     

Alam  Md. Ashraful  Rahman  Md. Mizanur  Biswas  Jatish Chandra  Akhter  Sohela  Maniruzzaman  M.  Choudhury  Apurba Kanti  Jahan  M. Abu Hena Sorwar  Miah  Md. Main Uddin  Sen  Ranjit  Kamal  M. Zia Uddin  Mannan  Md. Abdul  Shiragi  Humayun Kabir  Kabir  Wais  Kalra  Naveen 《Paddy and Water Environment》2019,17(4):677-688

Paddy and Water Environment - Rice-based cropping systems in Bangladesh have received little consideration of changing nitrogen (N) and carbon (C) in soil. Therefore, this study was conducted at...  相似文献   

Effect of Treated Wood on Biosolids Composting     

Abu Kamal  Kristine Wichuk  Kathleen Londry  Christian Felske 《Compost science & utilization》2017,25(3):178-193

The possibility of using construction and demolition (C&;D) waste wood as a bulking material in biosolids composting was investigated. Potential contaminants in C&;D waste wood include arsenic (As), chromium (Cr), and copper (Cu) from treated wood, and lead (Pb) from paints. Untreated and treated woodchips from C&;D wood were mixed with biosolids, composted using an aerated static pile process, and cured. There were no significant differences between untreated and treated woodchips with respect to composting process, time to stability, or product quality. Composting parameters monitored included moisture content, pH, electrical conductivity, organic matter degradation, fecal coliform levels, and stability by respirometry. Finished compost quality was evaluated in terms of potential toxic elements (PTE) levels. PTE values in treated woodchips (26 ± 35, 29 ± 41, 56 ± 46, and 5 ± 5 µg·g^?1 for As, Cr, Cu, and Pb, respectively) were higher and more variable than those in the untreated woodchips (3 ± 3, 17 ± 8, 13 ± 2, and 0.5 ± 0.0 µg·g^?1). However, both untreated and treated wood compost products met Canadian Council of Ministers of the Environment Category B values for PTE. In addition, and only molybdenum (Mo) and Cu exceeded Category A thresholds. Biosolids were the most significant contributor of Mo, while Cu contributions came from both biosolids and wood chips; some samples of pressure-treated wood showed concentrations of Cu in the range of 765 to 8,455 µg·g^?1. The results of this study suggest that treated wood from C&;D recycling facilities will not significantly degrade the quality of biosolids compost products.  相似文献   

Wastewater Irrigation Effect on Soil,Crop and Environment: a Pilot Scale Study at Irbid,Jordan     

Shahalam  Albulbasher  Abu Zahra  Bassam M.  Jaradat  A. 《Water, air, and soil pollution》1998,106(3-4):425-445

An investigation was carried out at pilot scale to test the feasibility of using the effluent of a rotating biological contactors (RBC) unit treating wastewater generated from a university campus. The objective of the study was to cerefully monitor the impact of wastewater irrigation on the soil, percolating water, crop growth and the pathogenic condition within the immediate vicinity of wastewater application. Experimental plots with three crops: alfalfa, radish and tomato were irrigated with fresh and waste waters. The irrigation water was applied by sprinklers. Each crop was given two sub-treatments: with fertilizer and without fertilizer. The physical and chemical properties of the soil, the crop yields, and subsurface drainage were measured. In most of the cases, the yields resulted from the uses of wastewater with fertilizer were compatible with those of the uses of freshwater with fertilizer. The washings of tomato fruits grown with wastewater were analyzed for fecal coliforms. It appeared that the fruit skins were free of viable fecal coliforms 24 hours after the wastewater application. Subsurface drainage analyses did not show any alarming levels of constituents irrespective of the source of the water: wastewater or freshwater. The wastewater irrigation applied for a season had no significant effect on a silty loam soil. With wastewater irrigation, slught changes in the soil porosity and salinity were observed.  相似文献   

Identification of bacterial agents causing mortality in postlarvae of giant freshwater prawn (Macrobrachium rosenbergii) in south‐west coastal districts of Bangladesh          下载免费PDF全文

Farzana E Hossain  Abu Mohammed Ramim  M Shafiqur Rahman  Ali Muhammad Omar Faruque  M Niamul Naser  Muhammad Manjurul Karim 《Aquaculture Research》2017,48(7):3545-3555

Following an incidence of freshwater prawn Macrobrachium rosenbergii postlarvae (PL) mortality in hatcheries in summer 2012, samples from dead PL, rearing water and prawn feed from two south‐west coastal districts of Bangladesh were collected to isolate, identify and characterize the agents causing PL mortality. Antibiogram profile of sixteen randomly selected bacteria, isolated from dead PL, that grew on TCBS, to 20 different antibiotics belonging to 12 major groups revealed that the drug resistance pattern varied from moderate (56% to the drugs: ciprofloxacin, cefotaxime, nitrofurantoin, kanamycin) to complete (to penicillin, ceftazidime and oxacillin) level. To identify the isolates, amplified rDNA restriction analysis (ARDRA) classified them in to four groups, and RAPD (randomly amplified polymorphic DNA) typing yielded nine different types of isolates within these four ARDRA groups. The 16S rDNA gene sequences identified that the groups were genotypically diverse belonging to the bacterial species: Enterobacter cloacae, Klebsiella pneumoniae, Exiguobacterium profundum and Enterococcus casseliflavus, respectively, that all demonstrated their killing potential to PLs in a simulated environment. The study therefore identified four different bacterial pathogens, one of which, Exiguobacterium profundum is reported for the first here in Bangladesh, that demand special consideration for disease management strategy.  相似文献   

Genetic parameters for survival during the grow‐out period in the GIFT strain of Nile tilapia (Oreochromis niloticus) and correlated response to selection for harvest weight          下载免费PDF全文

Azhar Hamzah  Wagdy Mekkawy  Hooi Ling Khaw  Nguyen Hong Nguyen  Hoong Yip Yee  Khairul Rizal Abu Bakar  Siti Azizah Mohd Nor  Raul W Ponzoni 《Aquaculture Research》2017,48(1):47-55

The aims of this study were the estimation of genetic parameters for survival rate from tagging until harvest and the evaluation of the correlated response in survival rate to selection for harvest weight in the genetically improved farmed tilapia (GIFT) strain. The heritability for survival rate was low (0.038), and so was its genetic correlation with harvest weight (0.065), suggesting that selecting for the latter trait would have had no effect on survival. The calculation of the probability of survival by spawning season and line, fitting a model that included the random effects of individual animal and common environment, confirmed this prediction. There were very small and variable between line differences in the probability of survival, which generally favoured the selection line. We conclude that the focus of the GIFT programme on improving harvest weight was not detrimental to the survival of the fish during the grow‐out phase.  相似文献   

Leveling-index based variable rate seeding technique for paddy     

Abu Bakar  B.  Ahmad  M. T.  Ghazali  M. S. S.  Abd Rani  M. N. F.  Mhd Bookeri  M. A.  Abdul Rahman  M. S.  Abdullah  M. Z. K.  Ismail  R. 《Precision Agriculture》2020,21(4):729-736

Precision Agriculture - Poor land leveling of paddy fields leads to irrigation problems which affect crop establishment and ultimately yield. One way to manage this is to vary the seeding rate...  相似文献   

免耕播种机的使用问题和解决对策     

阿木提江&#;阿布都热西提 《湖南农机》2017,44(6)

目前我国已经在很多地区使用了免耕播种机,这种机械对土壤的有效利用效果十分明显,并且极大地提升了耕种的效率,有效降低了耕种的成本,更重要的是利用免耕播种机也能有效保护土壤.文章主要介绍了免耕播种机的结构和原理,同时也讲述了播种机的注意事项和常见问题的解决对策,旨在能够让更多的人了解和使用免耕播种机.  相似文献   

Cutaneous habronemiasis in horses and domestic donkeys (Equus asinus asinus)     

F H Mohamed  M T Abu Samra  K E Ibrahim  S O Idris 《Revue d'élevage et de médecine vétérinaire des pays tropicaux》1990,42(4):535-540

Cutaneous habronemiasis in 15 horses and 5 donkeys is described. The lesions were distributed in many parts of the body involving the medial canthus, shoulder and pectoral regions, knee and fetlock joints, abdominal wall and prepuce. Some animals had more than one lesion. The lesions were ulcerative and filled with soft light red granulation tissue. When curretted, the deeper layers revealed a dense fibrous tissue with calcified foci. Close examination of the lesions showed that the superficial layer of this dense fibrous tissue contained small caseated and necrotic foci. The same features prevailed in lesions involving the muscular areas, but the deeper layers consisted of a dense granuloma with no evidence of cicatrization. Curretted material digested in potassium hydroxide revealed fragments of larvae of the nematode suggestive of Draschia or Habronema. The histopathological changes were severe and comprised: necrotic foci in a dense fibrous stroma infiltrated with eosinophils, macrophages and few giant cells. Sections of the larvae surrounded by eosinophils were encountered in lesions of the muscular areas. Curretting and excision of the lesion were effective and produced complete healing of the wound by scar tissue formation.  相似文献   

Effects of phosphorous fertilizer on seedlings growth and nodulation capabilities of some popular agroforestry tree species of Bangladesh   总被引：1，自引：0，他引：1  

Mohammad Belal Uddin Sharif Ahmed Mukul Mohammed Abu Sayed Arfin Khan Mohammed Kamal Hossain 《林业研究》2007,18(4):283-286

An experiment was conducted to assess the effect of Phosphorous （P） fertilizer （i.e. TSP or triple super phosphate @ 80 kg/hm^2） on seedling growth and nodulation capabilities of three potentially important agroforestry tree species （Acacia auriculiformis, Albizia lebbeck and Albizia procera） of Bangladesh. The study was conducted in nursery beds with six-month-old polybag seedlings ofA. auriculiformis, A. lebbeck and A. procera. The effects of P fertilizer on seedling growth and nodulation were compared with that of the seedlings grown in control （i.e. unfertilized soil）. The observations revealed that the seedling growth was enhanced significantly with the application of P fertilizer. The growth was found more pronounced in A. auriculiformis, whereas it was not apparent and shows depressed growth in case ofA. lebbeck. The study also suggests that the nodulation in terms of nodule number and size was also increased significantly with the application of P fertilizer.  相似文献   

Clinical zinc and copper deficiencies in cattle of western Sudan   总被引：2，自引：1，他引：1  

H. Abu Damir  M. E. S. Barri  S. M. El Hassan  M. H. Tageldin  A. A. Wahbi  O. F. Idris 《Tropical animal health and production》1988,20(1):52-56

Clinical cases of both Zn and Cu deficiencies are reported in a cattle farm in Kordofan Region of the Sudan after drought. The animals showed general weakness, stunted growth, infertility, parakeratosis and achromotrichia. There was macrocytic hypochromic anaemia and low Cu and Zn concentrations in sera. The condition was more prevalent in zebu-Friesian crosses than the local breeds. Drought and marginal or low Cu and Zn content in pasture may be the predisposing factors.  相似文献