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Papers by Piw Das

한국대기환경학회 학술대회논문집, May 1, 2007

Bulletin of Environmental Contamination and Toxicology, 2006

Journal of Environmental Science and Health, Part B, 2006

The degradative characteristics of butachlor (N-Butoxymethyl-2-chloro-2',6'-dieth... more The degradative characteristics of butachlor (N-Butoxymethyl-2-chloro-2',6'-diethyla- cetanilide) were studied under controlled laboratory conditions in clay loam alluvial (AL) soil (Typic udifluvent) and coastal saline (CS) soil (Typic endoaquept) from rice cultivated fields. The application rates included field rate (FR), 2-times FR (2FR) and 10-times FR (10FR). The incubation study was carried out at 30 degrees C with and without decomposed cow manure (DCM) at 60% of maximum water holding capacity (WHC) and waterlogged soil condition. The half-life values depended on the soil types and initial concentrations of butachlor. Butachlor degraded faster in AL soil and in soil amended with DCM under waterlogged condition. Microbial degradation is the major avenue of butachlor degradation from soils.

Among all the nitrogen species present in the atmosphere, ammonia forms a considerable portion al... more Among all the nitrogen species present in the atmosphere, ammonia forms a considerable portion along with the nitrogen oxides. The major sources of atmospheric ammonia are animal feedlot operations including emission from excreta of domestic animals and agricultural activities, followed by emission from synthetic fertilizers, biomass burning and to some lesser extent, fossil fuel combustion. Ammonia emission factor, expressed as the weight of ammonia per unit weight, volume, or duration of the activity emitting it, is generally used in developing emission estimates for emission inventories. The factors determining ammonia loss from soil or from manures are the temperature, pH, humidity, precipitation and the velocity of wind above it.

Journal of the Korean earth science society, 2007

한국대기환경학회 2007년 환경공동학술대회 초록집, May 1, 2007

Nepal Journal of Epidemiology, 2012

Background Contraceptive practice acceptable to Indian society is said to be associated with soci... more Background Contraceptive practice acceptable to Indian society is said to be associated with socio-economic status, education, practice of the area and other factors. Population stabilization and a gradual lowering of population growth is the basic aim behind contraceptive practice. Objectives The study was conducted to assess current status of contraceptive practice and social covariates (age, type of family, religion, socio-economy, education, etc). Materials and Methods A community based cross-sectional study was conducted among four thousand eligible couples in Howrah and Paschim Midnapore districts of state of West Bengal, India from March to September 2009. By stratified multistage random sampling technique, 32 areas were selected from two districts; villages of sub-centre zone and wards of municipality; from each selected area; 125 eligible couples were interviewed by house to house survey. Results The contraceptive acceptance (prevalence) rate (CAR) by any method was 65.3 pe...

Research Journal of Environmental Sciences, 2007

Journal of Entomology, 2007

Geosciences Journal, 2008

Persistence of mancozeb (new formulation 75 WDG) was studied under field conditions in West Benga... more Persistence of mancozeb (new formulation 75 WDG) was studied under field conditions in West Bengal, India in tomato and potato crop following foliar spray application @ 750 and 1500 g ai ha’. Residues were determined after 3 sprays of mancozeb applied as per the good agricultural practices. Mancozeb residues were below detectable limits on the 5thday for the recommended dose and 7th day for double the recommended dose. The suggested waiting period ranged between 4 to 5 days for potato tuber and 5–6 days for tomato fruits. The half-life values varied from 1.2–1.3 days for the foliages of these vegetables as well as fruits and tubers.