Abstract
Quantity-intensity (Q/I) relationships for phosphate (P) in long-term cropping systems were studied for soils obtained from two research sites; Clarion-Webster Research Center (CWRC) at Kanawha and GalvaPrimghar Research Center (GPRC) at Sutherland, in Iowa. Soil samples were collected from three cropping systems: continuous corn (CCCC), corn-soybean-corn-soybean (CSCS), and corn-oats-meadow-meadow (COMM), with or without N fertilizer treatment. In these studies, a 1-g sample of CSCS > CCCC. At the GPRC site, however, the order was CCCC > COMM > CSCS. The a values were correlated significantly with the results of seven P tests evaluated, and the r values ranged from 0.637 ** to 0.846 *** . The a values were significantly, but negatively, correlated (r = -0.743 *** ) with the ECB values, and positively correlated (r = 0.893 *** ) with the EPC values. Useful relationships were developed between EBC and organic C, CEC, clay content, and exchangeable Ca.
Published Version
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