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• W2070339438 abstract "Four field experiments were carried out in Tamil Nadu, India, to determine effects of internal drainage (percolation rate) on growth and yield formation in rice, in interaction with nitrogen (N) management. Grain yield response to drainage was positive at all N levels in all experiments. Yields (averaged over N treatments) increased by 14% (Expt. 1), 10% (Expt. 2), 25% (Expt. 3) and 22% (Expt. 4) in response to drainage. Higher yield responses to N application were found under well drained than poorly drained soil conditions. In late-season crops under poor drainage, grain yields decreased in response to high doses of N. The positive yield response to drainage was always associated with increased number of filled grains per panicle (+ 13 to + 17%). increased translocation of stored reserves, increased root biomass at harvest ( + 20 to +36%), increased N concentration in roots and increased root activity (as measured by α-naphthylamine oxidation). Of the yield increment resulting from drainage, 25 to 35% could be accounted for by increased translocation of stem reserves in Expt. 1, 5 to 25% in Expt. 2 and 30 to 40% in Expt. 3. Yield increase in response to drainage was not always associated with more green leaf area, leaf longevity, leaf N content, crop N uptake, nor with a larger dry matter production at given levels of the leaf N pool and global radiation, as quantified with the help of a calibration factor ƒv.. A literature review is presented leading to two hypotheses to explain the effect of drainage on yield: (1) a possible potassium deficiency is expressed more in reduced (low-redox) soil due to a lowering of K availability per se; or to increased K demand associated with maintaining the root's ‘oxidizing power’; (2) improved root condition resulting from an increase in soil redox potential induces a prolonged synthesis and transport of cytokinins in roots, resulting in an extended photosynthetic activity, enhanced sink strength of grains and more translocation and deposition of carbohydrates in the grains. These hypotheses are not mutually exclusive. They were not explicitly tested in this study." @default.
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• W2070339438 title "Yield formation in rice in response to drainage and nitrogen application" @default.
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• W2070339438 doi "https://doi.org/10.1016/s0378-4290(96)01039-8" @default.
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