EVALUATION OF UPLAND RICE (ORYZA-SATIVA L) GENOTYPES FOR INTERCROPPING WITH PIGEON PEA (CAJANUS-CAJAN [L] (MILL SP))

Eleven upland rice genotypes of varying growth duration and plant stat ure were evaluated in two cropping systems: monocrop and intercrop, wi th pigeon pea cv. UPAS 120, in order to study the effects of intercrop ping on rice grain yield and its contributing characteristics during 1 990 to 1992 wet seasons. Cropping system and cropping system x genotyp e interaction effects were significant for yield ha(-1), panicle weigh t, panicles m(-2) and spikelet fertility suggesting the need for evalu ating and selecting genotypes suitable for intercropping. Rice grain y ield reduction in the intercrop ranged from 24.5% in genotype RR 203-1 6 to 54.5% in genotype Aditya. Panicle weight, total dry matter at flo wering as well as at harvest, and harvest index were also reduced. Pla nt height and panicle weight were positively associated with yield in both systems, however, the yield was positively and significantly corr elated with spikelets per panicle and spikelet fertility with the inte rcropping system. The correlation between cropping systems indicated t he possibility of simultaneous improvement for these characteristics i n monocropping and intercropping.