An evaluation of plant-borne factors promoting the solubilization of alkaline rock phosphates

0106 biological sciences 2. Zero hunger fixation Rock phosphate solubilization Alkaline uptake pattern 04 agricultural and veterinary sciences Acidic uptake pattern 15. Life on land Rhodes grass NO3 01 natural sciences Maize Field bean Symbiotic N2 nutrition NH4 Rape 0401 agriculture, forestry, and fisheries Ryegrass Buckwheat
DOI: 10.1007/bf02369971 Publication Date: 2006-04-08T13:14:26Z
ABSTRACT
Four experiments are described in which the uptake patterns of various crop species were shown to enhance the solubilization of alkaline rock phosphates. In most cases, such enhancements resulted from soil acidification brought about by the alkaline uptake patterns. In one case, the enhancement may have stemmed primarily from a high Ca-uptake rate, which might be responsible for a shift in mass-action equilibria favoring the solubilization of rock phosphates. High uptake of Ca is expected to serve two purposes: 1. it acts in creating alkaline uptake patterns causing a decline in soil pH, and 2. it promotes a shift in mass-action equilibria.
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