Abstract
The soils of Punjab are coarse textured and low in organic matter, therefore leaching of boron (B) beyond the root zone is more likely to occur in these soils. To study the depth-wise B availability in different soil types , samples were collected (0-15 cm, 15-30 cm, 30-60 cm and 60-90 cm) depth from soils representing Ustic Torripsamments, Typic Ustipsamments and Ustochreptic Camborthids. The highest (3.94 mg kg-1 soil) of hot water soluble boron (HWS-B) was observed in Ustochreptic Camborthids followed by Typic Ustipsamments (2.40 mg kg-1 soil) and Ustic Torripsamments (2.03 mg kg-1 soil). In general, hot water soluble B decreased with depth to the tune of 41.8, 35.4 and 36.4 per cent in Ustic Torripsamments, 16.2, 15.0 and 31.2 per cent in Typic Ustipsamments and 17.2, 29.1 and 39.1 per cent in Ustochreptic Camborthids, respectively. Significant positive correlations of HWS-B were observed with pH, organic carbon of soil and negative with CaCO3.
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