Changes in soil properties during recent 10 years and their present condition [in Japan], 1: On the chemical characteristics of orchard soil
1989
Kitahara, I. (Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Nakashima, Y. | Mitui, H.
Changes in soil properties of several kinds of orchard soils were clarified by using the data of the soil surveys from 1979 to 1987, which were carried out in Fukuoka prefecture. The results obtained are as follows: 1) Changes among soil groups: Andosol soils were rich in humus content and had large Cation Exchange Capacity (CEC). But they showed little change during these 10 years. The other soil groups showed increases in CEC, humus and available phosphorus content. Depth of first layer decreased. In all soil groups, more than 100mg of available phosphorus were accumulated in the layers. 2) Changes among soil textures: Much humus existed in fine-textured soil compared with coarse-textured soil. The CEC value and available phosphorus content of fine-textured soil increased after 5 years. 3) Changes among trees: Much change of soil properties was observed in soil of satsuma mandarin and tea orchards. Little change was found in late maturing citrus variety, grape, pear and Japanese persimmon orchards. In satsuma mandarin orchards, total-nitrogen, humus, CEC and available phosphoric acid increased in fine-texture soil but these values did not change in coarse-texture soil
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