Dry Matter Production and Nitrogen Uptake as Influenced by Irrigation and Nitrogen Levels in Maize
B. Soujanya *
Water Technology Center, PJTS Agricultural University, Rajendranagar, Hyderabad, India.
B. Balaji Naik
Agro Climate Research Center, PJTS Agricultural University, Rajendranagar, Hyderabad, India.
M. Uma Devi
Water Technology Center, PJTS Agricultural University, Rajendranagar, Hyderabad, India.
T. L. Neelima
Water Technology Center, PJTS Agricultural University, Rajendranagar, Hyderabad, India.
Anima Biswal
National Remote Sensing Centre, ISRO, Balanagar, Hyderabad, India.
*Author to whom correspondence should be addressed.
Abstract
A field experiment was conducted at Agro Climate Research Center, Agricultural Research Institute, P.J.T.S Agricultural University, Rajendranagar, Hyderabad, India during rabi 2019-20. The field experiment was laid out in a split plot design with three replications. The treatments comprising of three irrigation scheduling based on (Depletion of Available Soil Moisture) at 60% DASM, 40% DASM and 20% DASM as main plots and three nitrogen levels viz., 90, 180 and 240 kg N ha-1 as sub-plots. The experiment was laid out in split plot design. The results indicated that, among the different treatment combinations, the crop irrigation scheduled at 20 % DASM in conjunction with 240 kg N ha-1 accumulated significantly more dry matter of 34.2 g, 149.2 g, 233.7 g and 284.8 g plant-1, at 6th leaf, silking, dough and physiological maturity stages, respectively. The nitrogen uptake was found to be more when the crop was irrigated at 20 % DASM in conjunction with 240 kg N ha-1 (67.1 g, 231.8 g, 294.7 g and 305.3 g plant-1) at 6th leaf, silking, dough and physiological maturity stages, respectively.
Keywords: Maize, water and nitrogen stress, dry matter, nitrogen uptake