Root phosphatase activity of sorghum genotypes grown with organic and inorganic sources of phosphorus

Furlani, A.M.C.; Clark, R.B.; Maranville, J.W.; Ross, W.M.

Journal of Plant Nutrition 7(11): 1583-1595


ISSN/ISBN: 0190-4167
DOI: 10.1080/01904168409363304
Accession: 001453345

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Relatively insoluble sources of phosphorus (P) may require solubilization, and organic P (Po) may require hydrolysis to inorganic P (Pi) before P can be readily absorbed by plants roots. The mechanisms for these processes, however, are unknown. Root phosphatase (Pase) activity was measured to assess its relationships to P uptake by seven sorghum (Sorghum bicolor) genotypes grown with Po (ethylammonium phosphate, glycerophosphate, and phenylphosphate) and Pi (KH2PO4, calcium tribasic phosphate, calcium pyrophosphate, aluminium phosphate, and ferric phosphate) in nutrient solutions in a greenhouse.