| Autor: |
Sutton, Paul, Seay, W. A. |
| Zdroj: |
Soil Science Society of America Journal; March 1958, Vol. 22 Issue: 2 p110-115, 6p |
| Abstrakt: |
Six soils were cropped in the greenhouse with millet and Kenland red clover to determine the potassium‐supplying power of the soils and the degree of correlation between the potassium removed by the crops and that extracted by four chemical methods. Potassium fertilizer was applied to determine the effect this would have on the potassium‐supplying power. Potassium was extracted from moist and air‐dry soil samples with 0.15NH2SO4, 1.38NH2SO4, 1NNH4Ac and 1NHNO3. The potassium extracted from moist soil samples correlated better than did air‐dry soil samples with the amount of potassium removed from the soils by millet. The potassium extracted by 1NNH4Ac and 1.38NH2SO4from moist soil samples correlated better than did air‐dry soil samples with the amount of potassium removed from the soils by clover. The differences in potassium extracted from moist and dry samples were small for the 0.15NH2SO4and 1NNH4Ac methods. The potassium extracted by 0.15NH2SO4and 1NNH4Ac from air‐dry soil samples and the potassium extracted by 1.38NH2SO4from moist soils gave the best indexes for evaluating the potassium‐supplying power of these soils. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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