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DETERMINING THE NUTRITIONAL REQUIREMENTS OF RICE GENOTYPE JAJAI 25/A EVOLVED AT NIA, TANDO JAM, PAKISTAN

PARVEZ KHAN^*, MUHAMMAD ASLAM, MUHAMMAD YOUSUF MEMON, MUHAMMAD IMTIAZ, JAVAID AHMED SHAH AND NIZAMUDDIN DEPAR

Abstract: Field studies on rice genotype Jajai 25/A were carried out to investigate the effect of different nitrogen and phosphorus levels on its growth during kharif 2006 and 2007 at experimental farm NIA, Tando Jam, Pakistan. Three levels of nitrogen i.e., 60, 90 and 120 kg ha^-1 and 7 levels of phosphorus i.e. 15, 23, 30, 40, 45, 60 and 90 kg P₂O₅ ha^-1 alongwith control were employed to see their effect on its yield and yield components. The results revealed that the number of productive tillers per hill, number of grains per panicle, 100-grain weight and paddy yield showed increasing trend up to 90 kg N and 60 kg P₂O₅ ha^-1, while the plant height and straw yield showed the increasing trend up to 120 kg N and 90 kg P₂O₅ ha^-1. The highest average paddy yield (4780 kg ha^-1), number of grains per panicle (122.3), 100-grain weight (2.16 g) and productive tillers per hill (26.6) were recorded at 90 kg N and 60 kg P₂O₅ ha^-1, while the tallest plant (109.9 cm) and straw yield (5657 kg ha^-1) were obtained at 120 kg N and 90 kg P₂O₅ ha^-1. It would suggest that 90 kg N and 60 kg P₂O₅ ha^-1 could be the optimum dose for this genotype under the agro-climatic condition of Tandojam, Pakistan.

Soil Science Division, Nuclear Institute of Agriculture, Tando Jam-70060, Pakistan

^*E-mail: parvez_08@yahoo.com