Pedosphere 5(4): 357--361, 1995
ISSN 1002-0160/CN 32-1315/P
©1995 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of organic manure on phosphorus adsorption-desorption and availability in paddy soil derived from red earth
NI Wu-Zhong, ZHANG Yong-Song and SUN Xi
Dept. of Soil Sci. and Agrochem., Zhejiang Agricultural Untversity, Hangzhou 310029 (China)
ABSTRACT
      A field test with the traditional rotation of paddy rice/upland crop (wheat) was carried out on a paddy soil derived from red earth to elucidate the effect of organic manure on the phosphorus adsorption-desorption by soil and its P availability. Soil samples were taken from different treatments at rice harvesting stage and analysed. The isothermal adsorption of P by the samples fitted very well with Langmuir equation, and hence, the parameters in the equation, i.e., maximum adsorption (qm), constant related to bonding energy (k) and their product (k × qm) could be used as a comprehensive index to characterize the potential P adsorptivity of the soil. Organo-inorganic fertilization and organic manuring could decrease qm and k, while mineral P application had little effect on them. The isothermal desorption of P was significantly correlated with initially added and isothermally adsorbed P. Part of P added was fixed, which represented the P fixation capacity of soil, and organic manuring could obviously lower the P fixation. The content of soil available P had a significant negative correlation with qm, k and fixed P. It is concluded that organic manure could increase the P availability of paddy soil derived from red earth by decreasing qm, k, maximum buffering capacity (MBC=k × qm) and fixation capacity.
Key Words:  adsorption-desorption, availability, organic manure, paddy soil derived from red earth, phos-phorus
Citation: Ni, W. Z., Zhang, Y. S. and Sun, X. 1995. Effect of organic manure on phosphorus adsorption-desorption and availability in paddy soil derived from red earth. Pedosphere. 5(4): 357-361.
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