Integrated nutrient management for rice (Oryza sativa)-based cropping system

A field experiment was conducted during July 1991-October 1993 to study the productivity, fertility build-out, net production value and nutrient uptake in 2 rice (Oryza saliva L.)-bascd cropping systems. The productivity of rice was maximum in rice (rainy season)-fodder oat (Avena saliva L.)-rice (winter season)-green-manure sweet clover or senji [Melilotus alba (L.) All.; syn M. parviflora Desf.]-rice (winter season)-fodder sorghum [Sorghum bicolor (L.) Moench], where rice was green-manured in situ with cowpea and senji during rainy and winter seasons with application farmyard manure @ 10 tonnes/ha along with 50% N60P40K40 and N80P60K60 to both rice respectively. The maximum net production was recorded in rice (rainy season)sweet clover (fodder)-rice (winter season)-cowpea (fodder) sequence, where rice was fertilized with farmyard manure @ 10 tonnes/ha along with N30P20K20 and K40P30K30 to rainy and winter-season rice respectively. The maximum total uptake of nutrients (N, P, K and S) per annum was recorded in rice-oat (fodder)-rice cowpea (green-manure) sequence, where rice during both the seasons was fertilized with N30P20K20 and N40P30K30 along with farmyard manure @ 10 tonnes/ha.