Response of Rice (Oryza sativa l.) Cultivars to Nitrogen Fertilization under Aerobic and Transplanted Condition

Abstract

An experiment was conducted during kharif, 2007 at Agricultural college farm, ANGRAU, Rajendranagar, Hyderabad where fourteen popular short and medium duration rice varieties were studied at varied N levels for their response under aerobic and transplanted situations in double split plot design with two replications. The grain yield obtained both under aerobic and transplanted condition were comparable in Naveen, MTU 1010 and Erramallelu. On the other hand, varieties IR-64, Tellahamsa, Erramallelu, Rajendra, hybrid ARB-17 (1) K-06, MTU 1010 and Naveen performed better under aerobic condition and varieties Naveen, MTU 1001, MTU 1010 and Er­ramallelu recorded higher yields under transplanted condition. The grain yield increased significantly with increase in N level from 0 to 50, 100 and 150 kg ha-1. The total water requirement was 7314 and 11757 m3ha-1 in aerobic and transplanted conditions, respectively. The water productivity of cultivars was higher under aerobic condition than that under transplanted condition and ranged from 0.29 to 0.83 and 0.14 to 0.49 kg m-3 of water in aerobic and transplanted condition, respectively.