Figure 4 Geographical Distribution of Net Primary Production

(t dry matter/ (ha・yr)) of Natural Terrestrial Vegetation

(Based on Uchijima and Kiyono, 1988)

Figure 5 Effect of Soil Moisture to Dry-Matter Production and Harvest Index of Corn Field. (Based on Ustenko, 1963)

Water Content of Cultivated Soil (Percentage figures against field moisture capacity)

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