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- W1974404465 abstract "Abstract Manganese deficiency is frequently encountered in soybeans (Glycine Max. L., Merrill) on naturally high pH, fine textured, poorly drained soils (Vertic Haplaquept) in Kentucky. Information is needed for diagnosing deficient fields by soil tests and on the efficiency of Mn fertilizer applied to these soils. At two locations where Mn deficiency had occurred, MnSO4 was applied at annual rates up to 360 and 600 kg of Mn/ha. At site 1, where DTPA extractable Mn averaged 5.9 pg/g on untreated soil with pH of 7.4, seed yields were increased significantly in 1977 and over the three‐year period by Mn fertilization. Yields were unaffected by treatment at site 2, where extractable Mn averaged 5.8 pg/g and pH was 6.3. Concentrations of Mn in trifoliates of plants growing in untreated soil averaged 15–16 pg/g for three of the five site‐years. However, there were apparent seasonal effects of climate on Mn availability in certain years which resulted in Mn levels of 24–29 pg/g in trifoliates of plants growing in untreated soils. Total Mn content of the soil was 130–200 yg/g, and a significant portion of this was in the reducible fraction. Periods of high soil water content at critical stages of growth may have caused reducing conditions, thereby increasing availability of soil Mn. In a laboratory experiment, 54MnSO4 was converted primarily to unavailable forms during seven days contact with the Vertic haplaquept soil. After two weeks, the proportion of added Mn (75 ug/g) in reducible, Fe‐occluded, and residual fractions were 46%, 20%, and 32%, respectively. This rapid immobilization explained why high rates of Mn fertilization increased concentrations in trifoliates only an average of 0.02 pg/g and DTPA extractable soil Mn only 0.02 to 0.005 pg/g per kg of applied Mn/ha." @default.
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- W1974404465 date "1983-06-01" @default.
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- W1974404465 title "Low efficiency of manganese fertilization of soybeans on a haplaquept soil" @default.
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- W1974404465 doi "https://doi.org/10.1080/00103628309367374" @default.
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