HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Giordano, P. M. Articles by Mortvedt, J. J. Search for Related Content PubMed Articles by Giordano, P. M. Articles by Mortvedt, J. J. Agricola Articles by Giordano, P. M. Articles by Mortvedt, J. J.

Zinc Sources and Methods of Application for Rice¹

Because of the relatively recent diagnosis of Zn deficiency in rice (Oryza sativa L.), the most effective sources of Zn and methods of application for flooded soils have not been established. In a greenhouse experiment, growth of rice on flooded Nolichucky sandy clay loam limed to pH 7.5 was similar with soil applications of ZnO, ZnSO₄, and ZnEDTA. Uptake of Zn by immature plants was in the order: ZnO > ZnSO₄ > ZnEDTA. Application of ZnSO₄ to the flood water, the rice seed, or the soil resulted in comparable increases in dry matter production and Zn uptake.

The adherence of Zn to rice roots dipped in Zn suspensions and the subsequent availability to the plant was studied in the laboratory and the greenhouse. Suspensions containing ZnO were more effective in supplying Zn than those prepared with ZnS. The presence of attapulgite clay in the suspensions increased adherence to roots but decreased Zn availability to the plant. Suspensions containing more than 5% Zn were not practical because of excessive viscosity. Response, however, to Zn adhering to seedling dipped in suspensions containing 1 and 5% Zn as ZnO was similar to that where ZnO was mixed with the soil to supply 4 ppm of Zn.

Key Words: ZnO • ZnSO₄ • ZnEDTA • Seed treatment • Zn placement • Zn suspensions

² Research Soil Chemists.

Received for publication April 12, 1972.