The effects of applications of zinc and different sources of phosphorus on growth and nutrient uptake by rice 1

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Abstract
An investigation was conducted in the greenhouse to determine the effects of applications of zinc (Zn) and different sources of phosphorus (P) on the production of dry matter and on the concentration and uptake of P and Zn in plant tissue of rice, Oryza sativa L., cultivar Saturn, at the vegetative growth phase on Crowley silt loam, pH 5.3. When no Zn was applied, normal superphosphate (NSP) was superior to concentrated superphosphate (CSP), diammonium phosphate (DAP) and mono‐ammonium phosphate (MAP), but it was not a better source of phosphorus than ammonium polyphosphate (APP) in the production of dry matter of rice plants. When Zn was applied, NSP and APP were superior to the other sources of P. The application of CSP with or without Zn resulted in the highest concentration of P in the rice tissue. The largest amount of P taken up by the rice plants occurred on the soil that received an application of NSP or APP irrespective of the Zn treatment. The application of all of the sources of P resulted in a depression in the concentration of Zn in the plant tissue. Rice plants absorbed more Zn from the soil when NSP was applied with or without Zn.