INTERACTIVE EFFECTS OF WATER AND NITROGEN STRESS ON BIOMASS ACCUMULATION, NITROGEN UPTAKE AND SEED YIELD OF MAIZE
Maize is a multi-faceted crop used as food,Â feed and industrial crop globally. It is grown throughoutÂ the world, with the United States, China, and Brazil
being the top three maize producing countries in theÂ world, producing approximately 563 of the 717 millionÂ tons/year (Ranum et al., 2019). Water and nitrogenÂ are the most important factors which play a major role
in better growth and yield of maize (Hammad et al.,2011). Maize crop growth is affected by differentÂ stresses viz., deficit irrigation, pest, weed, nutrients,Â etc., which reduce the productivity. Water stressÂ occurring at different crop developmental stages couldÂ potentially limit biomass accumulation andÂ consequently reduce grain yield of the maize crop. The
interactive effects of water and nitrogen shows anÂ impact on morphological, physiological and yieldÂ attributes of maize. Ramachandiran and Pazhanivelan,Â (2015) stated that, owing to the increased frequency
of irrigation along with a higher dose of nitrogenÂ application leading to increased nutrient uptake, higherÂ photosynthetic rate leading to higher plant height, LAIÂ and dry matter production. Whereas, when maizeÂ grown under conditions of limited water supply requiresÂ less nitrogen to achieve the maximum grain yield thanÂ that required with well water supply (Moser et al., 2006).Â Optimization of nitrogen dose based on availability ofÂ soil moisture and crop response is need of hour. HenceÂ this investigation was designed to study the yieldÂ response of maize crop under differential water andÂ nitrogen levels to optimize the nitrogen use based onÂ availability of water for irrigation in maize crop.