Pedosphere 5(3): 267--274, 1995
ISSN 1002-0160/CN 32-1315/P
©1995 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Phosphate distribution and movement in soil-root interface zone: Ⅱ. The influence of soil water content and application rates of phosphate
XU Ming-Gang, ZHANG Yi-Ping and SUN Ben-Hua
Department of Soil Science, Northwestern Agricultural University, Yangling, Shaanxi 712100 (China)
ABSTRACT
      The phosphate in the soil-root interface zone under various soil water contents and application rates of phosphate was still of depletion distribution which could be described by a power function in the form of C/Co= axb(C/Co is the relative content of fertilized phosphate in a distance from the root surface x, a and b are the regression constants). The depletion rate of phosphate in soil near the root surface was higher and the depletion range was narrower under lower soil moisture. On the contrary, at higher soil water content the depletion range was wider, generally. The application rate of phosphate led to the greater depletion intensity of phosphorus was higher in the heavier texture soils. In general, the depletion intensity in the soils, which decreased with increasing clay content or increasing buffering power of soil, decreased in the order as loessal soil and black lou soil > lou soil > yellow cinnamon soil when 50 or 100 mg of phosphorus were applied in the form of KH2PO4. This result indicated that the phosphate distribution and its movement in the soil-root interface zone closely related with the buffering capacity of soil.
Key Words:  application rate of phosphate, phosphate distribution, soil-root interface zone, soil watercontent
Citation: Xu, M. G., Zhang, Y. P. and Sun, B. H. 1995. Phosphate distribution and movement in soil-root interface zone: Ⅱ. The influence of soil water content and application rates of phosphate. Pedosphere. 5(3): 267-274.
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