Soil Boron Extractions as Indicators of Boron Content of Field-grown Crops

BORON (B) is a micronutrient element that plants require in trace amounts.The concentration range in which plants exhibit neither deficiency nor toxicity symptoms is narrower for B than for any other nutrient element. Plants can experience both B deficiency and B toxicity in a single growing season (Reisenauer et al., 1973). In humid regions, rainfall can cause excessive leaching of B, and fertilization is often required to avoid deficiency symptoms. In arid regions, on the other hand, lack of drainage and additions of B via irrigation water often produce symptoms of toxicity (Nable et al., 1997). Soil tests for plant-available B have been developed principally to diagnose deficiency,not to determine toxicity. Historically, the most common method for estimating available soil B has SOIL BORON EXTRACTIONS AS INDICATORS OF BORON CONTENT OF FIELD-GROWN CROPS