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Articles by S.K. Das
Total Records ( 6 ) for S.K. Das
  S.K. Das , S.K. Singh , B.P.S. Yadav and M.A. Khan
  The 2 crossbred low yielding milch cows were maintained in loose housing under the organic farming project and their performances were studied in the system. About 1 ha of land was brought under organic farming. About 50% land was earmarked for crop, i.e., paddy, wheat in different season, 20% land for fishery, 20% land for horticultural crop and 10% land was kept for dairy and fodder production. Overall mean yield of morning milk, evening milk and total milk per cow was found to be 3.966, 2.936 and 6.902 kg, respectively. Average daily intake of dry roughage, green roughage and concentrate per cow was 4.504, 7.134 and 6.371 kg, respectively. Average daily yield of dung was 12.891 kg. Highest total milk yield of cow (10.450 kg) was recorded in the month April. Higher milk yield during the month April was due to availability green fodder. Multiple Regression analysis of data indicated that daily milk yield of cow increases by 339 and 811 g (p<0.01) per kg increase of green roughage intake and concentrate intake.
  D. CHAKRABARTY , S.K. DAS and M.K. DAS
  Three hundred adult healthy earthworms (udrillus euginae) ranging length and weight from 14–29cm (mean 21.5±6.8cm) to 1.6–3.0g (mean 2.55±1.1g), respectively, were cultured in three different substrate for 70days. The substrates were soil alone, (control T-1), cow (Bos taurus) dung and water hyacinth (ichhornia crassipes) (1:1 T-2), and partially dried neem (Azadirachta indica) leaves with kitchen waste (1:1 T-3). The earthworms were grown in these substrates in a wooden chamber (0.8m×0.5m×0.2m) and these were subjected to monitoring for various growth patterns (length, biomass, number) at every fortnight (five observations) interval. The observations showed that T-2 was the best among the three treatments used. There was significant difference (P<0.05) between the mean values of growth efficiency in food conversion among the treatments. However, there was no significant difference (P>0.05) between the mean values of survival rate of earthworm among different treatments.

  S.K. Das , Md. Dulal Sarkar , M.J. Alam , M.G. Robbani and M.H. Kabir
  The influences of four levels of plant growth regulators on BARI Misti Morich-1 and Lamuyo varieties of bell pepper were studied at the horticulture farm of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh from October 2012 to March 2013. Plant Growth Regulators (PGR) was applied on bell pepper varieties which had significant effect on yield of bell pepper. Among those treatments, growth regulator 4-CPA was more potential to enhance flowering by 4.00 days earlier and it also increased number of flowers plant-1 (5%), number of fruits plant-1 (35%), fruit setting (26.02%) and yield of fruit per hacter (39%) with the varieties of Lamuyo as compared to the fruit set where hormone was not applied. The variety Lamuyo produces about 10% higher yield than BARI Misti morich-1. Among those, growth regulator, 4-CPA showed best potentiality to solve flower and fruit dropping problem of bell pepper.
  A.K. Bhattacharya , S.N. Mandal and S.K. Das
  Concentration of chromium and cadmium were investigated in the gill, gonads, skin and muscle tissues of six commercially edible fishes sampled from upper course of gangetic West Bengal. Heavy metal concentrations in the tissues tended to vary significantly among seasons and monsoon period showed particularly high metal concentration compared to pre-monsoon and post-monsoon period. Muscle tissues and gill showed higher concentration of chromium and cadmium than the gonads and skin. Highest concentration of chromium and cadmium was detected in gill tissues. Lowest concentration observed in gonads of fish sampled from upper course of the River Ganga. Analysis of the above two metals were also carried out in ambient aquatic and sediment phases to monitor the degree of pollution. Higher values of chromium and cadmium were observed in sediment phases in comparison to water and fish. Further metals were observed to become bio-accumulated. High degree of species-specificity was also observed for metal accumulation and in case of chromium accumulation rate was higher than that of cadmium. During study, influence of physico-chemical parameters like pH, Alkalinity and temperature were also investigated to find out if they have any influence on accumulation phenomenon of chromium and cadmium in the muscle tissue of the selected fish species.
  S.N. Mandal and S.K. Das
  The present study has been carried out to evaluate the frictional pressure drop across the different piping components for non-Newtonian liquid flow. Empirical correlations in term of the various physical and dynamic variables of the system have been developed for prediction of the frictional pressure drop across the each piping component.
  A.K. Bhattacharya , S.N. Mandal and S.K. Das
  Heavy metal pollution is a great concern to the environmental is widespread and non-degradable. It seems to be man`s worst endeavor in his attempt to augment industrial development. Heavy metals are bioaccumulative and relatively stable as well as toxic/carcinogen and therefore require close monitoring. Concentration of zinc, chromium, copper, cadmium and lead were investigated in the gill, gonads, skin and muscle tissues of six commercially edible fishes from upper stretch of the Ganga River at West Bengal, India. The study area receives a wide variety of wastes generated by municipalities and the industries like paints and pigments, metal processing industries, thermal power plants, electro-processing industries etc. situated on the both side of the river Ganga. Simultaneous analysis of the metals was also carried out in the sediment and aquatic phases to monitor the degree of contamination. The results of this study indicated that the six commercially edible fishes through food, water and sediment leading thereby to bioaccumulation took the metals present in the river ecosystem. Heavy metal concentrations in the tissues tended to vary significantly among season and monsoon period showed particularly high metal concentration compared to pre-monsoon and post-monsoon. Muscle tissues and gill showed higher concentration of zinc, chromium, copper, cadmium and lead than gonads and skin (p< 0.05). Highest concentration of zinc, chromium, copper, cadmium and lead were detected in gill tissues (p < 0.05). Lowest concentration observed in gonads of fish sampled from upper course of the River Ganga. Further, metal accumulation showed high degree of species specificity, where the order of accumulation of heavy metals was zinc>copper>chromium>cadmium>lead.
 
 
 
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