Author(s):

Aparna V, Subrahmanyam D and Narender Reddy S

Abstract: Nitrogen is essential macronutrient and is a major nutrient element required for the developing high yielding rice cultivars. This study was investigating the genotypic differences in N content among root, stem, leaf, and grain of 12 different rice genotypes under two different nitrogen levels viz., 50% (T1) and 100% (T2) recommended dose of nitrogen. Different agronomical and physiological characters were measured in selected 12 genotypes, growing in the field. The leaf N was recorded higher (1.45%) with rice genotype Vardhan. Chlorophyll content was recorded at the maximum vegetative and reproductive stage. Vardhan genotype recorded maximum and Jaya genotype recorded minimum under T1 and T2 treatments at both the stages. Leaf nitrogen content was higher in high NUE genotype Vardhan. High chlorophyll content and Nitrogen in the case of Vardhan support their higher grain yield. Nitrogen efficient genotypes Vardhan x MTU 1010/2, Rasi x Jaya/2, Vardhan and BPT 5204 genotypes showed a <5% reduction in grain yield over recommended N level. The experiment revealed significant genetic variability for NUE, nitrogen uptake efficiency (NUPE) and nitrogen utilization efficiency (NUTE) in both high N.

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