BALANCE SHEET OF NITROGEN IN SOIL AS INFLUENCED BYDIFFERENTIAL SUBSTITUTION OF NUTRIENTS THROUGH ORGANICSIN RICE BASED CROPPING SYSTEMMonika Banotra, B.C Sharma, Rakesh Kumar and Lalichetti SagarAbstract Field experiment was conducted for two consecutive years from kharif 2015 and summer 2017at researchfarm of Division of Agronomy, Skuast Jammu to study the effect of differential substitution of nutrientsthrough organics on yield, nitrogen uptake and balance sheet of nitrogen of four crops basmati rice (1stcrop) - knolkhol (2nd crop) - knolkhol (3rd crop) - green gram (4th crop) in cropping sequence for two years inIrrigated subtropical conditions of Jammu and Kashmir. The result of two year studied showedthatsignificantly highest yield of all the four crops in two crop cycles in the rice based cropping system viz.,basmati rice, knolkhol-1, knolkhol-2 and green gram were recorded with 100 % recommended dose offertilizer which was found statistically at par with yields recorded with treatments 75 % NPK+25 % Nthrough vermicompost and Fym (1:1),25% yearly replacement of RDF through vermicompostand Fym(1:1) on N basis,75% NPK+25% N through vermicompost,25 % yearly replacement of RDF throughvermicompost on N basis,75 % NPK+ 25 % N through Fymand 25% yearly replacement of RDF throughFym on N basis. Further, highest mean total nitrogen uptake (544.95 kg/ha) in rice based cropping systemwere recorded with treatment 25% yearly replacement of RDF through Fym on N basis followed by treatment75 % NPK+ 25 % N through Fym (541.29 kg/ha) whereas highest build-up of available nitrogen in soilafter two crop cycles (8.79 kg/ha) was recorded with treatment 100 % N through Farmyard manure followedby treatment 100% N through Vermicompost whereas lowest build-up of available nitrogen (4.53 kg/ha) insoil was recorded with treatment 100 % Recommended dose of fertilizer in rice based cropping system. |