Abstract
A field experiment was conducted on an alkali soil to evaluate the direct and the residual effect of six levels of zinc i.e. 0, 2.25, 4.5, 9.0, 18.0 and 27.0 kg Zn ha−1 added either once to the first crop only or continuously to each crop on the growth, yield and chemical composition of plants grown in a rice-wheat cropping sequence. The soils were amended with gypsum applied at the uniform rate of 14 t ha−1. Zinc was supplied as zinc sulphate. Application of zinc at the rate of 2.25 kg ha−1 to both rice and wheat crops or an annual application of 4.5 kg Zn ha−1 only to rice was found optimum for rice-wheat sequence. Higher zinc applications increased the availability of zinc in the soil and its content in the plants but did not increase crop yield. DTPA extractable zinc build up was more for zinc applied at the rate of 2.25 kg ha−1 to each crop compared to a single zinc application of equivalent amount. Results of these studies have shown that continuous Zn application up to 27 kg Zn ha−1 to each crop did not induce nutrient imbalances and had no adverse effect on crop yield.
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Singh, M., Abrol, I. Direct and residual effect of fertilizer zinc application on the yield and chemical composition of rice-wheat crops in an alkali soil. Fertilizer Research 8, 179–191 (1985). https://doi.org/10.1007/BF01048901
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DOI: https://doi.org/10.1007/BF01048901