Influence of pre kharif crops on rabi rice fallow blackgram in rice (Oryza sativa L.) based cropping system

A field study was conducted during pre kharif, kharif and rabi 2012–13 on sandy clay loam soils of Agricultural College Farm, Naira to find out the effect of preceding crop on the performance of succeeding rice fallow blackgram. The experiment was laid out in randomized block design with four replications and seven treatments. Significant differences were noticed with pre kharif crops on growth parameters, yield attributes and yield of rice fallow blackgram. Significantly superior dry matter (1455 kg ha−1), pods plant−1 (7.5), seeds pod−1(5.2), test weight (4.87 g−1), seed yield (382 kg ha−1) and haulm yield (743 kg ha−1) of rice fallow blackgram was observed with incorporation of sunnhemp followed by greengram while fallow registered the lowest for all these parameters. Sunnhemp-rice-rice fallow blackgram has also registered the highest returns per rupee invested (2.52) and hence was suggested for North Coastal Zone of Andhra Pradesh.