Peanut Molybdenum Deficiency
The problem of peanut molybdenum deficiency can be easily solved by applying this element, usually in the form of ammonium molybdenum or sodium molybdenum salt. The quantities needed for the crop are very small. As little as 300 to 600 mg/ha of ammonium molybdenum can correct the disorder. Liming materials (eg. calcium carbonate) should be applied to acidic soils to increase the soil pH to 6.0 to 6.5. Alternatively, a foliar spray of 0.01-0.05 % ammonium molybdenum solution should be applied repeatedly every 10 days untill the deficiency is corrected. The total quantity is about 1000 L/ha.
People usually found peanut lacks of molybdenum by soil analysis. Soil with 0.02 mg/L or less of water soluble molybdenum (Mo) (about 3.5 mg/kg or less of total molybdenum in soils, or 0.4 mg/kg or less of exchangeable Mo in soils) probably cannot supply enough to support normal peanut growth and yield.
Molybdenum deficiency is found in peanut growing in sandy soils, and in very acidic soils (pH lower than 5.5). It is also found in soils with a very high iron content, and in peat soils with a very low iron content. It is found in soils to which excessive phosphate fertilizer has been applied, and in soils with high levels of calcium, manganese, iron and copper.
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