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Methane emission from flooded rice fields under irrigated conditions 总被引：11，自引：0，他引：11
T. K. Adhya Amarendra K. Rath P. K. Gupta V. R. Rao S. N. Das K. M. Parida D. C. Parashar N. Sethunathan 《Biology and Fertility of Soils》1994,18(3):245-248
In a study on CH4 emission from flooded rice fields under irrigated conditions, fields planted with rice emitted more methane than unplanted fields. The CH4 efflux in planted plots varied with the rice variety and growth stage and ranged from 4 to 26 mg h-1m-2. During the reproductive stage of the rice plants, CH4 emission was high and the oxidation power of rice roots, in terms of -naphthylamine oxidation, was very low. The CH4 emission reached a maximum at midday and declined to minimum levels at midnight, irrespective of the rice variety. The peak CH4 emission at midday was associated with higher solar radiation and higher soil/water temperature. 相似文献
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Kulshrestha U. C. Sarkar A. K. Srivastava S. S. Parashar D. C. 《Water, air, and soil pollution》1995,85(4):2137-2142
Water, Air, & Soil Pollution - Rain water samples were collected at New Delhi during the monsoon of 1994 at a height of 30 m above the ground level using a wet-only collector. Simultaneously,... 相似文献
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U. C. Kulshrestha A. K. Sarkar S. S. Srivastava D. C. Parashar 《Water, air, and soil pollution》1995,85(4):2143-2148
Rain water samples of equal volume (50 mL) were collected from two couvective showers at New Delhi on 28 July and 23 August during the monsoon, 1994. The variation of constituents of both the showers showed different trends which might have been due to different antecedent periods. The first shower occurred after an antecedent period of 2–3 hours while the second shower occurred after a 14 day interval. The first shower had acidic pH (<5.6) and relatively higher concentration of NH4, SO4, NO3, Cl, F and K indicating insignificant below cloud scavenging. The second shower had alkaline pH (>5.6) and relatively higher concentrations of Ca and Mg. The higher concentration of Ca and Mg in the second shower were due to the loading with particulate matter during the preceding 14 days which made below cloud scavenging significant. 相似文献
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K. S. Parashar Rajendra Prasad R. P. Sharma S. N. Sharma Surendra Singh 《植物养料与土壤学杂志》1980,143(3):262-267
A field experiment conducted for two crop seasons (1976-77 and 1977-78) showed that the treatment of urea with nitrification inhibitor Nitrapyrin (also refered as ‘N-Serve’) or neem (Azadirachta indica A. Juss) cake increased its efficiency by preventing N losses and produced significantly more cane. In one of the years sulphur coated urea (Gold N) at lower rate (75 kg N/ha) gave higher sucrose content in juice and significantly more commercial cane sugar (CCS) than uncoated urea. Considering both the cane yield and CCS production mixing or coating of urea with neem cake holds considerable promise and needs wider testing along with and in comparison to nitrification inhibitors and sulphur coated urea and other slow release fertilizers for increasing the efficiency of nitrogen applied to sugarcane. 相似文献
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Perturbation of red cell membrane structure during intracellular maturation of Plasmodium falciparum 总被引：3，自引：0，他引：3
An experimental approach, which in this study was applied to the malarial system, can be used to analyze the molecular structure and organization of individual phospholipids in a wide variety of biological membranes. Electron spin resonance spectroscopy was used to investigate the structural modifications of the major red cell phospholipids that occur in erythrocyte membranes infected with the human malarial parasite, Plasmodium falciparum. These modifications were correlated with the intracellular developmental stage of the parasite. Phosphatidylcholine, phosphatidylethanolamine, and phosphatidylserine were increasingly disordered (fluidized) as infection progressed. This disordering occurred at different rates and to varying extents. 相似文献
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Umesh C. Kulshrestha Monika J. Kulshrestha R. Sekar M. Vairamani Ajit K. Sarkar Danesh C. Parashar 《Water, air, and soil pollution》2001,130(1-4):1685-1690
Increased industrialization and urbanization lead to the atmospheric acidity which causes acid rain. However, in India, the nature of rain water has been observed to be alkaline. The reason for alkaline nature of rain water is found to be the buffering of acidity by soil-derived aerosols which are rich in Ca. Over the Indian Ocean where concentrations of soil dust are negligible, the acid rain has been observed to be a common phenomenon during INDOEX campaigns. In the Indian subcontinent, observations have indicated that rain becomes acidic when the buffering potential of rain water is weak. The weak buffering potential may be due to less interference of soil dust, acidic nature of soil or very high influence of industrial source. 相似文献
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