Abstract
AbstractThree sources of boron including highâgrade Fertilizer Borate, Colemanite and Howlite were compared as to their waterâsoluble boron contents, effect on plant growth and movement within the soil profile.Based on millârun samples, the waterâsoluble boron in Fertilizer Borate was 5 times greater than in Colemanite and 25 times greater than in Howlite.Particle size had only a slight effect on the waterâsoluble boron recovered from Fertilizer Borate, but for Colemanite and Howlite the amount of waterâsoluble boron recovered was 6 to 8 times greater for finer than 80âmesh material as compared to coarser than 10âmesh material. This indicates the importance of particle size in controlling the rate of solubility of the more slowly soluble sources of boron.Although the waterâsoluble boron in Fertilizer Borate, Colemanite and Howlite was in the ratio of approximately 1:5:25, the boron contents and toxicity symptoms of turnips and soybeans grown in the greenhouse in Norfolk loamy sand indicated a requirement of about twice as much Colemanite as Fertilizer Borate and 2 to 3 times as much Howlite as Colemanite to produce the same degree of toxicity.Results of the field leaching study on Norfolk loamy sand indicate that highâgrade Fertilizer Borate leached out of the topsoil very rapidly and collected in the lower zones of 8 to 16 and 16 to 24 inches. Twelve months later most of the waterâsoluble boron had been leached past the 2âfoot depth. Howlite leached out of the topsoil slowly; the concentrations of waterâsoluble boron remained fairly constant for the 6 and the 12âmonth periods. Colemanite was found to be intermediate between the highly soluble sodium borate and the less soluble borosilicate from the standpoint of loss by leaching.
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