Soil and plant potassium as affected by soil temperature under controlled environment

Weber, J.B. and Caldwell, A.C. (1964) Soil and plant potassium as affected by soil temperature under controlled environment. Soil Science Society of America Journal, 28 (5). pp. 661-667.

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Studies on the effect of soil temperature and moisture on the K-supplying power of two soils were carried out in a growth chamber. Air temperature and lighting were programmed to follow a constant daily cycle, while soil temperature was kept constant with an insulated water bath assembly. Soil and plant K determinations were made at each of five stages of growth. Regression and correlation analyses were performed to describe the various response curves. Correlations were also made to describe the relationships between the plant and soil K measurements. Results obtained from these studies showed soil temperature to have a tremendous effect on the K-supplying power of a Floyd soil and much less of an effect on a Milaca soil. Plant yields were increased similarly on both soils with increased soil temperature, but K yields on the Floyd soil were increased from two to three times those of the Milaca soil. A significant response to applied K was obtained on both soils at low soil temperatures, but only the Milaca soil showed a substantial response at the high soil temperature. Correlations between plant and soil K measurements indicated that plants on the Milaca soil utilized exchangeable K at both low and high soil temperatures, whereas those on the Floyd soil utilized exchangeable K at low soil temperatures, and both exchangeable and nonexchangeable forms at high soil temperatures. Both soils fixed substantial amounts of applied K, but temperature effects on the two soils were very different and it appeared as though different fixation processes were involved. It was concluded from these studies that the erratic response to K fertilization on the Floyd soil in different years can be attributed primarily to differences in soil temperatures. Yield increases from K applications were obtained on this soil at low temperatures but not at high temperatures.

Item Type: Article
Author Affiliation: University of North Carolina, Raleigh, NC, USA
Subjects: Soil Science and Microbiology > Soil Sciences
Environmental Science > Environment
Divisions: Other Crops
Depositing User: Sandhya Gir
Date Deposited: 26 Oct 2010 10:56
Last Modified: 26 Oct 2010 10:57
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