Abstract
Studies conducted on the effect of water table (WT) depth on boron (B) distribution, plant B and B leaching from soil revealed that both hot-water soluble B (HWSB) and cold water soluble B (CWSB) increased with soil depth and proximity to WT. Hot-water soluble B as an index of plant available B remained high (> 1.5 mg kg-1) even with a deeper WT and increased further under shallow (<65 cm) WT. Increased levels of HWSB and CWSB in the soil were positively correlated with increased electrical conductivity and increased plant B and negatively with seed yield of sunflower (Helianthus annuus) cultivars. Leaching of B was less efficient in deeper than shallow WT and required twice the amount of water required for leaching of salt.
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