BORON SOURCES OF MODERATE SOLUBILITY AS SUPPLEMENTS FOR SANDY SOILS

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Abstract
On Lakeland fine sand, sourcea less soluble than borax caused less toxicity and produced better yields. After 4 mos. and 21 in. of rain the boiling-water extractable B remaining in the top 6 in. from equivalent amts. of borax, fertilizer borate, Kernite and Colemanite was, respectively, 3.5, 3.5, 7.1 and 10.6%. All 4 materials corrected B-deficiency in rutabagas, but the more soluble borax and fertilizer borate depressed the yield. Borax and Colemanite at 40 lbs. per acre caused 78% and 25% reduction in yield of hairy indigo (Indigofera hirsuta), but 20-mesh borosilicate (13% B2O3) inhibited yield only at 200 lbs. or more per acre. At 30 lbs. per acre 100-mesh borosilicate corrected all B-deficiency symptoms in rutabagas; 90 lbs. produced the highest quality roots and the best yield; 270 lbs. exceeded the nutrient requirement for B but produced no toxicity.

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