Vol. 2 No. 1
Integrated effect of organic and inorganic fertilizer on the productivity and profitability of rice grown under rice-rice crop sequences in the Gangetic West Bengal.
Abstract: A field experiment was carried out for two consecutive years (June 2002 to May 2004) during kharifand boro seasons in each year to study the effect of integrated nutrient supply system under rice (Oryza saliva L.) - rice (high yielding) cropping system in the sub humid subtropical climatic coi1dition of West Bengal at Regional Research Sub-Station (RRS), Chakdaha, Nadia, West Bengal. The farm is situated at 23°5.3\' N latitude and 83°5.3\' E longitude and 9. 75 m above the mean sea level. The rice variety used was IET 4786 (Satabdi). The experiment was laid out in a randomised block design (RBD) with twelve treatments and three replications. The land was medium land and the soil was sandy clay loam in texture. The plot size was 15 1112 • Experimental results revealed that maximum production (9.26 t/ha/year) was recorded when the crop received 50% recommended doses of nutrients through ferti lizer along with 50% dos~s ofnutrient through green leaf manuring during kharif season and 100% recommended doses of nutrients through fertilizer during boro season. The above treatment also gave highest value of net return and return/rupee investment (Rs. 24939.25/ha/year and Rs 1.66, respectively). The next highest production, net retu~n and return/rupee investment was recorded where the crop was fertilized with 100% recommended doses of nutrient through chemical fertilizer in both kharif and boro seasons. Use of green leaf to substitute half of the recommended NPK enhanced productivity by 0.6 to 1.1 % over sole chemical fertilization at the recommended level: Crop residue and FYM slightly decreased crop productivity as composed to sole chemical fertilization.
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