Effect of N forms on leaf nitrate reductase activity, yield, and protein content of rice
1988
Reddy, A.T. | Reddy, D.V.R. | Rao, V.S. | Kumar, T.V. | Pillai, R.N. | Subba Rao, I.V. (Agricultural Coll., Bapatla (India). Soil Science and Agricultural Chemistry Dept.)
Using four replications, the relationship of leaf nitrate reductase activity (NRA) was studied at crop growth stages to yield and protein content of rough rice as affected by N forms during 1987 wet season at Agricultural College, Bapatla [India]. MTV 5249 (Vajram) was grown in glazed pots (6 kg soil/pot) under flooded conditions. The seedlings (3 wk) were transplanted at 2 seedlings/pot and fertilized separately with potassium nitrate, urea, and ammonium sulfate (120 kg N/ha) with a basal dose of superphosphate (40 kg P/ha) and muriate of potash (40 kg K/ha). Control was no N. Nitrogen was supplied in 3 split doses at transplanting, 25 d after transplanting (DT), and 50 DT. Experimental soil was heavy-textured clay loam with pH 7.0, 0.45% organic C, and 94-12-700 kg available NPK/ha. Leaf NRA was assayed in the uppermost leaf or flag leaf at maximum tillering panicle initiation flowering stages. It was in the order maximum tillering panicle initiation flowering. Potassium nitrate treatment recorded highest NRA, followed by urea and ammonium sulfate. Neither grain yields nor protein content differed significantly among N forms. However, N fertilizer improved grain yield and protein content compared to the control.
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