Available Molybdenum Status of Deep Black Soils of Madhya Pradesh

In a pot culture experiment with deep black soils of Madhya Pradesh, there was no response of applied molybdenum on the yield of alfalfa. There was high availability of soil applied molybdenum. A significant relationship between available molybdenum and ammonium oxalate extractable molybdenum in soils was observed. Soils containing as little as 0.05 ppm available molybdenum had sufficient supply for normal plant growth as evidenced by no yield response and plant concentration of molybdenum above 0.5 ppm, which is considered critical for plant growth. Of one hundred and eighty four samples from deep black soil region, none contained less than 0 05 ppm ammonium oxalate (pH 3.3) extractable molybdenum and, therefore, these soils are not deficient in molybdenum.