Studies about the effect of environment on plant growth parameters of rice (Oryza sativa L.) cultivars

Abstract

A field experiment was conducted during kharif season of 2015 in sandy loam soil of A.N.D.U.A. & T., Kumarganj, Ayodhya (U.P.). The experiment consisted of nine treatment combinations comprised of three transplanting dates viz., July 5th, July 15th and July 25th and three varieties viz., Sarjoo-52, NDR-359 and Swarna Sub-1. Results reveal that different phenophases of rice markedly varied with only dates of transplanting but also different weather variables which ultimately create the different crop growing environment to harvest the yield accordingly. Highest Growing Degree days (GDD) was recorded in growing environment of July 15th (2365.9 0days) transplanting at all the phenophases followed by July 5th (2264.1 0days) and July 25th (2018.0 0days) transplanting while among the variety Swarna Sub-1 (2409.9 0days) recoded highest GDD due to occurrence of long duration Variety NDR-359 found suitable for higher productivity (55.55 q/ha) followed by Swarna Sub-1(53.06 q/ha) and Sarjoo-52 (50.89 q/ha). Among the varieties maximum crop growth rate (gm-2d-1) was observed in NDR-359 at 15-30, 30-45, 45-60, 60-75 and 75-90 days after transplanting which was superior over Swarna sub-1 and Sarjoo-52 at all growth stages of crop. Among the varieties maximum relative growth rate was observed in NDR-359 at 15-30, 30-45, 45-60, 60-75 and 75-90 days after transplanting followed by Swarna sub-1 and Sarjoo-52 at all growth stages of crop.