This study was carried out, in the second growing season, on the growth of grape and soil erosion in both naked and sod mulched areas as influenced by various slpoes of vineyard in order to make more efficient use of the sloping area.
The soil composition after the culture of fruit tree is in general, variable. After the second rowing season, there was no difference of soil properties among treatments.
Although the sod grew uniformlly in all plots concerned in spite of slope, the trees grown on steep slope showed more linear growth and dry weight of leaves. On the other hand, on the naked area, they proved to be the best on leve-and. The content of inorganic composition of heaves vary according to the period. The content of nitrogen in the leaves decreased as the leaves become older. The curve of K₂O content formed a peak in the intermediate stage and decreased again thereafter, while P₂O₃ content was reversed in the intermediate stage.
The seasonal change of the content of inorganic matter in the soil loss is variable.
The amount of soil loss and the inorganic composition in the soil loss was observed to become higher as the slope was steeper, especially it was much higher in the naked soil than in the sod mulch area.
The yield of fruit in the maturing stage was less in the naked soil as the slope was steeper, while it was reversed in the sod mulch plot.
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