Abstract

Studies were conducted at the Tirupati campus of the Andhra Pradesh Agri- cultural University to find out the effect of nitrogen (0, 90 and 180 Kg N/ha) and plant population (10 and 6.7 lakhs / ha) levels at recommended irrigation practice on yield and yield components of Jaya rice during rabi 1978 and Kharif 1979 on sandy loam soils. Increasing nitrogen levels from no nitrogen to 180 kg N/ha increa sed the number of productive tillers, filled grains and test weight. Lower plant poplation (6 67 lakhs / ha) resulted in more number of productive tillers per plant and filled grains per panicle. Higher grain and straw yields were obtained with 180 kg N/ha and 6.67 lakhs plant population/ha. The results indicated that rice under recommended water management practice of 2 and 5 cm depth of submergence during Kharif and rabi respectively, had response upto 180 kg N/ha. uptake of NPK increased with increase in nitrogen level and decrease in plant population level.

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