Phenotyping for Nitrogen Use Efficiency: Rice Genotypes Differ in N-Responsive Germination, Oxygen Consumption, Seed Urease Activities, Root Growth, Crop Duration, and Yield at Low N.

However, among various forms of N used, only nitrate and urea were highly significant in their effects on germination ( P < 0.01), whereas ammonium chloride and ammonium nitrate were relatively less, though significant (P < 0.05, Table 1 ).

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