Relation between size fraction component of soil and soil water retentivity especially water content in the green space irrigation
1995
Yabashi, S. (Chiba Univ., Matsudo (Japan). Faculty of Horticulture) | Amemiya, Y. | Takahashi, S.
This paper explains the method to estimate the soil water retentivity or the available water capacity by using a sand mass fraction measurement which can be easily achieved by sieving. The regression analysis on 60 soil samples in Japan showed the wetness on retentivity curve can be estimated from the size fraction component of soil. Among the size fraction component of soil, the best relation was obtained with sand, correlation coefficient being 0.8. When the wetness was over pF 2.5, an improvement of relation was observed with every soil size fraction. On the other hand, the wetness differences at several pF ranges versus soil size fraction relationship was examined and the best correlation coefficient was 0.6, which was worse than that obtained in wetness estimation. The factor that deteriorates the relation seems to be included in the low pF soil water range. Nevertheless, since the relations were statistically significant upon the analysis of variation at 1% significance, the results of this study are applicable for the simple estimation of available water capacity in situ
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