Abstract
Soils containing high B are found in many places in Pakistan. Generally these soils are also low in Zn content. A pot culture experiment was conducted to determine the effect of higher doses of Zn and B application on the yield of rice and to determine their residual effect on the yield and composition of following wheat. Two rice genotypes (DM-25 and Basmati-385) that differed in B tolerance were grown up to maturity in pots supplied with nil or 20 mg kg-1 each of Zn and B alone or in combination. The results indicated that high B application decreased the dry matter yield of both rice genotypes at vegetative stage and the grain yield at maturity. Zinc application without B increased grain yield of Basmati-385 but not of DM-25, but in the presence of high B, applied Zn could not improve the grain yield of both genotypes to a significant level. Residual B had little depressive effect on the following wheat. However, Punjab-85, which is more tolerant to high B in soil, yielded higher than low tolerant Faisalabad-83 and this increase was mainly due to increased number of tillers per plant. Residual B did not reduce Zn concentration while residual Zn significantly increased Zn concentration in wheat grain. Contrarily, residual Zn decreased B concentration and B-uptake in wheat grain where excessive B was applied to previous rice.
S.M. Akan. (2004) INFLUENCE OF ZINC AND BORON APPLICATION ON RICE YIELD AND THEIR RESIDUAL EFFECT ON THE YIELD AND COMPOSITION OF FOLLOWING WHEAT, The Journal Soil & Environment , Volume 23, Isuue (1.2).
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