INTEGRATED NUTRIENT MANAGEMENT FOR RICE (ORYZA SATIVA)-BASED CROPPINGSYSTEM

A field experiment was conducted during July 1991-October 1993 to stud y the productivity, fertility build-out, net production value and nutr ient uptake in 2 rice (Oryza saliva L.)-bascd cropping systems. The pr oductivity of rice was maximum in rice (rainy season)-fodder oat (Aven a 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-m anured in situ with cowpea and senji during rainy and winter seasons w ith application farmyard manure @ 10 tonnes/ha along with 50% N60P40K4 0 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 farmy ard manure @ 10 tonnes/ha along with N30P20K20 and K40P30K30 to rainy and winter-season rice respectively. The maximum total uptake of nutri ents (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.