<研究報告>輪換畑の保水性及びそれに関係する物理性の経年変化について(農業工学関係)

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Water retentivity and other relevant physical properties of the rotational farm soils were investigated for three years. The yearly changes of those are discussed in this paper. Results obtained are as follows ; 1. The air ratios at pF 1.6 of the upper soil layer (0-15 cm in depth) increase yearly and exceed the aimed value for dry fields after three years. 2. The values of apparent specific gravity of the upper soil layer decrease yearly. 3. The readily available moisture content (pF 1.8-3.0) of the upper soil layer increases yearly. But even after three years, that still does not reach the aimed value for dry fields. 4. In the lower soil layer (15-30 cm in depth), the yearly changes of the air ratios at pF 1.6, apparent specific gravity and the readily available moisture content are not remarkable. 5. The volumetric water content at the same value of pF decreases yearly in the upper and lower soil layers. 6. The rates of change of the volumetric water content increase around pF 2.2 in the upper soil layer yearly.
石川県農業短期大学の論文
1983-12-25