Phosphorus requirements of the wheat plant in various stages of its life cycle |
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Authors: | W Römer G Schilling |
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Institution: | (1) Sektion Pflanzenproduktion, Wissenschaftsbereich Agrochemie, Martin-Luther-Universität Halle-Wittenberg, Adam-Kuckhoff-Str. 17b, DDR-4020 Halle/S., DDR |
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Abstract: | Summary In pot experiments root growth and P uptake were found to precede shoot growth. The high rate of P uptake in the early stages of the life cycle is not an expression of luxury consumption but reflects a high P requirement in plants. Plants cultivated in nutrient solutions with different P concentrations during various stages of development showed that a high P supply (1 ppm) between Feekes stages 6 and 9 (30 days) caused a higher grain yield than the same P concentration between Feekes stages 11 and 17 (30 days). The early applied P caused a high number of fertile ears per area, a high number of grains per ear, and a high P pool in vegetative parts. The latter could be mobilized during the grain-filling period. Therefore, for high grain yields soil and fertilizers have to meet the high P requirement (about 20 g P/m root · day) in an early stage of plant growth. During the grain filling period the P supply can be much lower. |
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Keywords: | Daily P uptake per m root length P requirement during life cycle Pot experiment Solution culture Wheat |
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