Zinc deficiency of the rice plant on calcareous and neutral soils in the philippines

Abstract

Zinc deficiency in fields of flooded and upland rice have been reported from India (1, 2), West Pakistan (2), Japan (3, 4, 5), U. S. A. (6). and Brazil (Sousa de, D. M. and Hiroce, R., personal communication). These reports indicate that zinc deficiency in rice is prevalent in soils ranging from about neutral to alkaline, and, in particular, in calcareous soils. Since much of the Philippines is derived from lime-stones and coral reefs, zinc deficiency of rice ought to occur in the Philippines.