Site-specific potassium application based on the fertilizer potassium availability index of soil

Site-specific potassium application based on the fertilizer potassium availability index of soil Soil varies in its potassium (K+) content and ability to supply K+ to crops. Site-specific K+ management aims to optimize crop production and minimize K+ loss from the soil. The spatial variation of available K+ prior to fertilizer application, the K+ fixation capacity of soil and soil texture need to be taken into account for variable-rate K+ application. This study was done to measure the spatial variation of the fertilizer K+ availability index (AI), which shows the potential for K+ fixation, and to develop a strategy that takes the spatial distribution of this index into account for site-specific K+ application. To determine the fixation capacity, the linear relation between the amount of K+ added to soil and the amount of K+ fixed was determined on 40 topsoil samples. Samples of soil were equilibrated in a moist condition for 3 weeks after the addition of 0, 25, 75, 225 and 675 mg K+ kg−1. The increase in exchangeable K+ was described by a linear relationship. The fertilizer K+ availability index (slope) varied from 0.20 to 0.49, indicating 51–80% of added K+ was converted to the non-exchangeable form. Principal component analysis (PCA) showed that the first two components accounted for most of the variation, 48.7 and 26.3% of total variation, respectively. A non-hierarchical cluster analysis (k-means clustering) identified four groups and the amounts of fertilizer K+ required were calculated for each group. The results suggested that such classes could form a basis for variable-rate application to maintain an adequate K+ status for crop production and to reduce potential K+ loss from soil by leaching. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Precision Agriculture Springer Journals

Site-specific potassium application based on the fertilizer potassium availability index of soil

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Publisher
Springer US
Copyright
Copyright © 2007 by Springer Science+Business Media, LLC
Subject
Life Sciences; Agriculture; Soil Science & Conservation; Remote Sensing/Photogrammetry; Statistics for Engineering, Physics, Computer Science, Chemistry and Earth Sciences; Atmospheric Sciences
ISSN
1385-2256
eISSN
1573-1618
D.O.I.
10.1007/s11119-007-9039-8
Publisher site
See Article on Publisher Site

Abstract

Soil varies in its potassium (K+) content and ability to supply K+ to crops. Site-specific K+ management aims to optimize crop production and minimize K+ loss from the soil. The spatial variation of available K+ prior to fertilizer application, the K+ fixation capacity of soil and soil texture need to be taken into account for variable-rate K+ application. This study was done to measure the spatial variation of the fertilizer K+ availability index (AI), which shows the potential for K+ fixation, and to develop a strategy that takes the spatial distribution of this index into account for site-specific K+ application. To determine the fixation capacity, the linear relation between the amount of K+ added to soil and the amount of K+ fixed was determined on 40 topsoil samples. Samples of soil were equilibrated in a moist condition for 3 weeks after the addition of 0, 25, 75, 225 and 675 mg K+ kg−1. The increase in exchangeable K+ was described by a linear relationship. The fertilizer K+ availability index (slope) varied from 0.20 to 0.49, indicating 51–80% of added K+ was converted to the non-exchangeable form. Principal component analysis (PCA) showed that the first two components accounted for most of the variation, 48.7 and 26.3% of total variation, respectively. A non-hierarchical cluster analysis (k-means clustering) identified four groups and the amounts of fertilizer K+ required were calculated for each group. The results suggested that such classes could form a basis for variable-rate application to maintain an adequate K+ status for crop production and to reduce potential K+ loss from soil by leaching.

Journal

Precision AgricultureSpringer Journals

Published: Aug 28, 2007

References

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