Vol. 17 No. 1
Productivity of rice as influenced by irrigation regimes and nitrogen management practices under mechanized transplanting
Author(s): G. VIJAYSHEKAR, M. M. REDDY AND R. M. KUMAR
Abstract: A field experiment was carried out during kharif 2014 on clay loam soil at Indian Institute of Rice Research, Hyderabad with an objective to study the response of rice to irrigation regimes and nitrogen levels under mechanized transplanting. The experiment was laid out in a split plot design with three replications. Three irrigation regimes were taken as main plots and four nitrogen levels in subplots. Irrigation regimes include I1: Submergence (3±2 cm) throughout the crop period, I2: Saturation up to panicle initiation stage followed by maintaining (3±2 cm) standing water till maturity, I3: Alternate wetting and drying irrigation through PVC water pipe at (5 cm) fall from ground level and nitrogen levels viz., N1: 75 % RDN (90 kg ha-1), N2: 100 % RDN (120 kg ha-1), N3: 125 % RDN (150 kg ha-1) and N4: 150 % RDN (180 kg ha-1). Results revealed that saturation up to panicle initiation stage followed by maintaining (3±2 cm) standing water till maturity proved significantly superior in terms of yield attributes, grain and straw yield (7386 and 9638 kg ha-1, respectively), water productivity (0.55 kg m-3) and PFP N (nitrogen use efficiency) (55.8kg grain kg-1 N applied)over submergence (3±2 cm) throughout the crop period .150 % RDN recorded significantly higher yield attributes, grain and straw yield (8366 and 10611 kg ha-1, respectively) and water productivity (0.57 kg m-3) compared to 125 % RDN.Combination of maintenance of saturation up to panicle initiation stage followed by submergence till maturity and 150 kg N ha-1 was found to be the best for higher yield, water productivity and PFP N in rice under mechanized transplanting
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