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RELATIONS BETWEEN THE POTASH REQUIREMENTS OF CROPS AND METEOROLOGICAL CONDITIONS

F. VAN DER PAAUW
Plant and Soil
Vol. 9, No. 3 (March 1958), pp. 254-268
Published by: Springer
Stable URL: http://www.jstor.org/stable/42931762
Page Count: 15
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RELATIONS BETWEEN THE POTASH REQUIREMENTS OF CROPS AND METEOROLOGICAL CONDITIONS
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Abstract

Significant correlations have been found between the response of potatoes, spring wheat, and to some extent canary grass to applications of potash and the number of rainless days during the growing period. The influence of applications of potash on the tuber yield of potatoes was higher, on the depression of the under-water-weight of the tubers was less, and on the K₂O content of the tubers was lower, in dry years thereby indicating a decreased availability of soil potash in these years. The positive effect of applications of potash on the grain yield of wheat was highest in dry years. Ample applications of potash were found to depress yields in wet years which is also an indication of higher availability of potash in wet years. In the case of canary grass greater increases in the K₂O content of the straw after applications of potash were found in wet years. No significant correlations were found in the case of bean crops. The influence of weather conditions on the response to potash is probably greatest during emergence and the early phases of growth. In later periods the influence is slight.

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