Molybdenum Availability as Predicted from Selected Soil Chemical Properties
1979
Karimian, N. | Cox, F. R.
Molybdenum deficiencies have been noted in the southeastern United States but there is limited information on plant and available soil Mo levels. Also, there has been little research directed toward interpreting these levels. Samples of 20 Coastal Plain and Piedmont soils were extracted with acid ammonium oxalate solution (Grigg Mo) and with anion exchange resin (resin Mo). Grigg Mo levels ranged from 17 to 183 pg/kg and resin from 2.5 to 11.1 pg/kg. Growth and uptake of Mo was determined on Early Snowball cauliflower (Brassica olera cea botrytis L.) grown in the soils which had been treated with none or 1 pg Mo/g soil. Soils from the Piedmont region without Mo produced cauliflower plants with Mo deficiency symptoms. Applied Mo increased dry weight and Mo concentration of cauliflower grown in most of the soils. No correlation was found, however, between response or plant Mo concentration and extractable Mo. The relative yield increases for applied Mo and plant Mo concentration could both be predicted reasonably well, though, from the active iron ratio (amorphous Fe/free Fe) and soil pH levels.
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