Evaluation of different zinc sources for lowland rice production |
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| Authors: | P C Srivastava D Ghosh V P Singh |
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| Institution: | (1) Department of Soil Science, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar 263 145, India, IN;(2) Agronomy, Plant Physiology and Agroecology Division, The International Rice Research Institute, P. O. Box 933, Manila, Philippines e-mail: vpsingh@cgiar.org, Tel.: +63-2-8450563/8127686 ext. 514, Fax: +63-2-8911292/8450606, XX |
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| Abstract: | ZnSO4, Zn-enriched farmyard manure (Zn-FYM), Zn-tetraammonia complex sorbed on FYM Zn(NH3)4-FYM] and Zn-ethylenediaminetetraacetate (Zn-EDTA) were compared as Zn sources for rice production under lowland conditions.
The amount of Zn supplied by Zn-EDTA was one-tenth of that supplied by the other Zn sources. Zn application to a Zn-deficient
soil corrected the visual symptoms of Zn deficiency and significantly increased the total biomass, grain yields and the harvest
index of rice, as well as the Zn concentration in the grain and the uptake of Zn by the straw and the grains. Even with lower
rates of application (0.25 and 0.5 mg Zn kg–1 soil), Zn-EDTA treatments gave comparable values for these parameters, and the highest "Zn-mobilization efficiency" compared
to the other Zn sources. The content of diethylenetriaminepentaacetate (DTPA)-extractable Zn in the soil of the different
treatments after the harvest of rice was in the order; ZnSO4=Zn-FYM>Zn(NH3)4-FYM=Zn-EDTA. The application of Zn also significantly increased the number of panicles that emerged between 80 to 93 days
after transplanting, though the total number of panicles at harvest remained unaffected. The calculated panicle-emergence
index had a positive correlation with the grain yield of rice. The Zn-EDTA treatment, inspite of supplying the lowest amount of Zn, as well as leading to the lowest rate of Zn uptake, produced
the highest yields. Therefore, we concluded Zn-EDTA to be the most efficient source of Zn for lowland rice production.
Received: 20 October 1998 |
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| Keywords: | Rice Zinc uptake Zinc mobilization Panicle-emergence index Harvest index |
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