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Interactions of Zn and P with Soil Temperatures in Rice¹

Rice (Oryza sativa) was used as a test crop in greenhouse to study the interactions of Zn and P with soil temperatures m a Corning clay loam soil. A decrease in soil temperature from 30 C to 22.5 C and to 15 C gave a progressive decrease in dry weight. The response to Zn decreased with increasing soil temperatures. At 15 C, Zn application increased Zn concentration in the roots, but there was practically no translocation of Zn to the tops. Furthermore, at the lowest temperature the Zn concentration in tops of plants grown with added Zn was even lower than the Zn concentration of plants without added Zn at 22 C and 30 C. Application of P reduced the Zn concentration in tops and there was no effect on Zn concentration in roots. Application of Zn had no significant effect on P concentrations of rice plants.

Key Words: Plant response • P-Zn ratios • root-top • Corning clay loam

² Post Doctoral Fellow, Extension Soils Specialist, Lecturer, and Extension Technologist, respectively.