Phosphorus (P) absorption mechanisms of pigeonpea [Cakamis cakam] and groundnut [Arachis hypogaea] in andosols
1999
Otani, T. (National Inst. of Agro-Environmental Sciences, Tsukuba, Ibaraki (Japan)) | Ae, N. | Yamagata, M.
Phosphors (P) is the second most important nutrient for plants, next to nitrogen, and taken up from soils by roots. Phosphorus is contained significant amounts in the earth's crust, and the constituent of various rock and soil minerals. However, most amounts of P in soils are usually unavailable forms for plants, especially in Andosols which are the main upland soils in Japan. It was pointed out that P deficiency in soils is the main limiting factor for crop productions in developing countries. Price increases of P fertilizer are considered to be imminent due to the rapid depletion of high grade, low cost, phosphate rock reserves throughout the world. Therefore, search for the crops that are able to utilize less-available P, studying the reactions between roots and soils for superior P uptake, and stimulation of the ability, are important strategy to improve sustainability of agriculture, not only in marginal lands, but also in developed countries in the world. We have been studying about superior P uptake mechanisms of upland crops from P-deficient soils as follows; 1) research of P status in low fertile soils, mainly in Andosols which have highly P fixing capacity, 2) screening crops for their ability to take up P in the soils, 3) examination of several hypothetical factors by which plants can take up P advantageously from unavailable forms
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