Abstract
Abstract Because of its marked toxicity to plants even when present in relatively small amounts, boron has assumed unique importance in agriculture. High amounts of boron are usually found in soils of arid and semi-arid regions which are not sufficiently leached due to scarcity of rainfall and other wather resources. Ravinkovitch (18) has found that the soils of the Negev desert in Israel contained water soluble boron from 0.4 to 1.2 ppm with an average of 0.9 ppm boron in the surface soil. Whetstone et al. (21) have reported that desert soils of Nevada in the United States contained 10 to 133 ppm of total boron 0.5 to 127 ppm water-soluble boron in the surface soils and 0.3 to 51.0 ppm water-soluble boron in the sub-surface soils.
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