Changes of several physico-chemical properties of upland soils in Nagasaki prefecture [Japan]
1999
Inoue, K. (Nagasaki-ken. Agricultural and Forestry Experiment Station, Isahaya (Japan)) | Hujiyama, M. | Maeda, Y. | Otu, Y. | Tanaka, T.
We were engaged in this research in order to analyze the present and the passing year changes of physico-chemical properties of upland field soils in Nagasaki prefecture and we compared results in 1994 to 1998 (the fourth period) with those of 1979 to 1984 (the first period). (1) The efficient depth of topsoil was shallow more than 50% fields. (2) There were many fields where the apparent specific gravity is too high in feed and ordinary field. (3) It was analyzed that the pH value of soils went down in the ordinary field and the field of green-house culture. (4) The content of available phosphate rose in all fields. The rising rate in the ordinary field, the feed field and the field of green-house culture between the first period and the fourth period was 122%, 282% and 381% respectively. (5) The content of exchange potassium was too high in all fields. The rising rate in the ordinary field, the feed field and the field of green-house culture between the first period and the fourth period was 110%, 142% and 130% respectively. (6) Based on these analytical results, we recommend plowing deeply, applying of matured compost and proper use of chemical fertilizer in soil management
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