Methods and rates of application of Mn and its critical levels for wheat following rice on coarse textured soils |
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Authors: | VK Nayyar US Sadana TN Takkar |
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Affiliation: | (1) Department of Soils, Punjab Agricultural University, 141004 Ludhiana, India |
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Abstract: | Two field experiments were conducted on Mn-deficient soils to evaluate the efficiency of rates, methods and time of MnSO4.H2 O application for wheat. Manganese sulphate was broadcast and mixed in soils at the rate of 5 to 50kg Mn ha–1 before seeding and 10 to 40 kg Mn ha–1 as top dress at 28 days — just before first irrigation. Three sprays of 1% MnSO4·H2O unneutralised solutions were applied, the first at 26 days — 2 days before first irrigation and the others afterward at weekly intervals. Both the methods caused a significant and marked increase in grain yield. Three foliar sprays were as effective as soil applications of 20 to 40 Kg Mn ha–1 before seeding. The difference in grain yield resulting from soil applications of Mn before seeding and applications at the first irrigation was not significant. The DTPA-Mn status of 20 fields, selected on the basis of varying degree of Mn deficiency, was related to grain yield (r = 0.77**). Also grain yield of all the experiments had a significant correlation with Mn content of grain (r = 0.55** to 0.82**) and straw (r = 0.77** to 0.82**). The critical limits calculated by statistical method were 1.25, 2.18 and 3.5 mg Mn kg–1 soil for severe deficiency, deficiency and latent deficiency respectively for wheat. |
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Keywords: | critical limit of Mn highly permeable soils methods and rates of Mn Mn deficiency wheat |
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