Influence of organic and inorganic fertilisation and plant density on production potential of rice-rice cropping system

摘要

An investigation was carried out at Agricultural College, Madurai, Tamil Nadu, to study the direct and residual effects of organic manures integrated with inorganic N levels and plant densities on the production potential of rice-rice cropping system. Application of cattle manure (FYM or sheep penning) had pronounced direct effect on rice grain yield (7.92 and 7.86 t ha~(-1), respectively) as against 7.41 t ha~(-1) with green manure (Sesbania rostrata) application in kharif season, and residual effect with 6.01 and 5.71 t ha~(-1) respectively, in rabi season. Though the plant densities (8.33 and 6.67 lakh hills ha~(-1) did not affect the grain yield significantly in Kharif, low plant density recorded higher grain yield (5.61 t ha~(-1)) in rabi season. The most economical level of N was found to be 160 kg ha~(-1) for both the seasons.