Optimization of irrigation schedule, variety and plant spacing under System of Rice Intensification (SRI)
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Date
2008-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present study was conducted during the kharif 2007 at Crop Research Centre of G.B. Pant University of Agriculture and Technology,
Pantnagar (U.S. Nagar), Uttarakhand, on sandy loam soil, to find out optimum irrigation schedule, variety and spacing for rice under SRI.
The experiment was laid out in a Factorial Randomized Block Design with 4 replications, having 12 treatment combination of three factor i.e.
irrigation schedule (6 cm irrigation at 1, 3 and 5 days after disappearance of ponded water), varieties (Pant Dhan 10 and Pant Dhan 4) and spacing (20 × 20 cm and 25 × 25 cm). Different growth parameters at various crop stages, yield attributes and yield were increased significantly by irrigation at 1 and 3 DADPW over 5 DADPW. Of the two varieties tested, Pant Dhan 4 was found more suitable for SRI as compared to Pant Dhan 10. Planting geometry had no significant influence on yield. The N, P and K uptake was higher under no stress (irrigation at 1 DADPW) followed by mild stress (3 DADPW) and prolonged stress (5 DADPW). Plant spacing had no significant impact on N, P and K uptake. So, on the basis of one year experimental results, planting of Pant Dhan 4 at wider spacing (25 × 25 cm) and irrigation at 3 DADPW upto panicle emergence followed by shallow submergence recommended, under System of Rice Intensification.
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