Comparison of productivity between tropical and temperate maize, 1: Leaf senescence and productivity in relation to nitrogen nutrition
1995
Osaki, M. (Hokkaido Univ., Sapporo (Japan). Faculty of Agriculture)
To identify the difference in maize productivity between tropical and temperate regions, maize (Zea mays L.) plants were grown in two regions: in the fields of two CIMMYT Experimental Stations in Mexico and in a field of Hokkaido University in northern Japan. In conclusion, low productivity of tropical maize was mostly caused by rapid leaf senescence after flowering, then partially by the plant architecture. Since, after the rapid decrease of the nitrogen content from leaves, which is another aspect of leaf senescence, nitrogen absorption in plant decreased in spite of the adequate supply of nitrogen nutrient in soils, leaf senescence and root activity of tropical maize were regulated by leaf autonomy
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