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- W2350238622 abstract "Pot experiments are conducted to distinguish nitrogen nutrition characters of rice and adaptation to continuous water stress with the two main treatments:waterlogged soil condition and upland soil condition either by covering straw or flim.Compared with rice on waterlogged soil condition,dry matter ratios of root to shoot, leaf length, maximum root length, average root length, and root dry matter weight decrease, with a considerable increase, white root number and ratios of white root number to total root number,howeter.In addition, quantities of thin roots and root hairs are found from the roots of rice in upland farming.Compared with rice on waterlogged soil condition, the active absorption areas of roots, the activity of glycolic acid oxidase in leaves, the contents of chlorophyll a, b and a + b, the contents of NRA and NO_3-N both in leaves and roots increase significantly during nursery seedling stages in upland farming.Net photosynthesis rate diminishes obviously while ratios of chlorophyll a to b have little changes. From the young-panicle differentiation to heading stages, NRA,NO_3-N,hlorophyll a , b and total content of rice plant maintaine higher levels, whereas ratios of chlorophyll a to b decrease by 0.12 units. Net photosynthesis rate tends to be the same as those in waterlogged soil condition.Endogenous hormone of rice has greater changes in upland farming than in waterlogged cultivation. ABA both in roots and in leaves and GA_(1/3) in roots of rice cultivated in upland soil increase obviously at the young-panicle differentiation stage, whereas GA_(1/3) and iPA in leaves and iPA in roots of rice cultivated in upland soil diminishe significantly.IAA in roots of hybrid rice, Shanyou 63, increase to a great extent, but the reverse is true for upland rice 85-15. At the maturing stages of rice, IAA and GA_(1/3) in leaves, iPA in roots increase significantly while ABA in roots and in leaves decreases to some extent. There are significant differences in GA_(1/3) and IAA in roots and iPA in leaves among the varieties tested." @default.
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- W2350238622 date "2003-01-01" @default.
- W2350238622 modified "2023-09-26" @default.
- W2350238622 title "Physiological Responses to Rice Plant under Upland Farming with Mulching" @default.
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