FACTORS INFLUENCING AVAILABILITY OF BORON IN SOIL AND ITS DISTRIBUTION IN PLANTS

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Abstract
In a study of the effects of lime and fertilizers on the adequacy of the supply of B in Sassafras sandy loam, it was found that (for radishes and cauliflower) B-denciency Symptoms occurred at pH levels approaching 7, and became increasingly severe at higher values; the % and total amt. of B in plant tops decreased as the pH of the soil increased; of the 4 hydroxides tested, that of Mg caused the greatest reduction in the availability of soil B and Ca, Na, and K hydroxides had lesser effects, in the order named. In a study of the distribution of B in cauliflower plants grown on Dunellen sandy loam, it was found that applications of 5 or 10 lbs. of borax per acre overcame B deficiency, but 20-lb. applications resulted in toxicity; B consumption by plants increased when additional quantities of borax were added to the soil; the expressed juices of plants contained much less B than the remaining plant residue; and the B in plant residues from which the juice has been pressed is insoluble in cold water and in alcohol, but is appreciably soluble in hot water and completely soluble in 2% HC1 soln.

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