MUKESH KUMAR*, R. K. PANNU AND BHAGAT SINGH
Department of Agronomy, CCS Haryana Agricultural University, Hisar-125 004 (Haryana), India
*(e-mail : mukeshkumarkainwal@gmail.com)
(Received : January 19, 2017; Accepted : March 20, 2017)
ABSTRACT
It is necessary to give a sufficient amount of nitrogen to a plant for optimum yield and high-quality production. It is economically and environmentally important to determine the right amount of nitrogen needed by plants. A field experiment was conducted at CCS Haryana Agricultural University, Hisar during 2010-11 and 2011-12 to determine economic optimum nitrogen dose in late sown wheat under different levels of irrigations. The experiment consisting of three irrigation levels viz., one irrigation at CRI (I1), two irrigations at CRI and heading (I2) and four irrigations at CRI, late tillering, heading and milking (I3) in main plots and five nitrogen levels viz., control i. e. 0 kg N/ha (F0), 50 kg N/ha (F1), 100 kg N/ha (F2), recommended dose of nitrogen i. e. 150 kg N/ha (F3) and 200 kg N/ha (F4) in sub-plots was laid out in strip plot design with four replications.The relationship between the nitrogen amount applied and wheat yield was defined by using a quadratic function. Economically optimum N dose was calculated by marginal analysis. The results revealed that economic optimum dose of nitrogen for one irrigation, two irrigations and four irrigations was 122.1, 167.4 and 174.3 kg N/ha with yield 2776, 3862 and 4671 kg/ha, respectively. Agronomic optimum dose for one irrigation, two irrigations and four irrigations was 129.1, 176.5 and 182.8 kg N/ha with yield 2780, 3867 and 4675 kg/ha, respectively. Maximum net profit Rs. 25600 and 24171) and B : C ratio (1.55 and 1.46) were recorded with the application of four irrigations with 200 kg N/ha (I3F4) during 2010-11 and 2011-12, respectively.
Key words : Irrigation levels, EONR, AONR, benefit : cost ratio, late sown wheat