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Zinc Sources and Methods of Application for Rice 1
Author(s) -
Giordano P. M.,
Mortvedt J. J.
Publication year - 1973
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1973.00021962006500010015x
Subject(s) - oryza sativa , loam , zinc , chemistry , agronomy , greenhouse , seedling , dry matter , soil water , rice plant , environmental science , biology , soil science , biochemistry , organic chemistry , gene
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, ZnSO 4 , and ZnEDTA. Uptake of Zn by immature plants was in the order: ZnO > ZnSO 4 > ZnEDTA. Application of ZnSO 4 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.