Author(s):

Sweta Singh, Dr. Sangita Mohanty and Dr. Rakesh Banwasi

Abstract: Nitrogen plays an important role in plant growth and development and also the most expensive inputs in agricultural settings. Unutilized nitrogenous fertilizer in agricultural field is one of the causes of environmental pollution now-a-days. In rice based cropping system, utilizes only 30-40% of total applied nitrogen and rest goes to waste thereby creating environmental pollution as well as economic loss. Additionally, the loss of N increases costs, contributes to soil acidification, and causes off-site pollution of the air, groundwater and water bodies. Globally, the current important concern is to face the great challenges of improving nitrogen use efficiency and environmental sustainability. This study reviews current knowledge about technologies for N fertilization with potential to optimize sources and rates of application and reduce its negative effects on the environment. Classic inorganic sources such as urea are the major sources utilized. This experiment was carried out in factorial randomized block design with three replications at Cuttack, Odisha, India during Kharif season of 2017-2018 to asses growth and yield parameters of six rice cultivars (Naveen, Indira, Ratna, Surendra, Birupa and Daya) against six treatments of nitrogen levels (N1:0; N2:40; N3:60; N4:80; N5:100; and N6:150 kgNha^-1). Results revealed that Dry matter accumulation increased with N levels up to 150 kg N ha^-1 in all the cultivars. Whereas, increasing trend of grain yield is favored at higher levels of applied nitrogen in Indira, Surendra and Birupa although it declined at N application levels exceeding 100 kg N ha^-1 in rest of the cultivars.

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