AVAILABILITY OF MOLYBDENUM AS INFLUENCED BY LIMING

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Abstract
Russian and Argentine work has shown that the Mo content of their soils is approx. constant at 2.6 and 2 ppm. The same is true in the U. S. A., though as in Argentina there are a very few glaring exceptions. One U. S. soil contained 31.5 ppm. Mo, and since the availability of this element is increased by liming the question is raised that heavy liming might cause this soil to produce plants toxic to cattle (molybdenosis). A greenhouse expt. with alfalfa, crimson clover, and Austrian winter peas was carried out on this soil. Liming to pH 7.6 increased the Mo uptake from 6 to 11 times over the check for the legumes. For ryegrass the increase was much less. Liming increased the Mo content of alfalfa, crimson clover and Austrian winter peas to slightly above the toxic limit for cattle.

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