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Abstract
Field experiments during 2006–07 and 2007–08 were conducted in an Aeric Endoaquept to evaluate extractants suitable for boron (B) under the influence of organic matter and B in both rhizosphere (R) and nonrhizosphere (NR) soils with rape (Brassica campestris L.) as a test crop. The results reveal that the average B content in Mehlich 3 (MH-3) B was greatest (0.791 mg kg−1) in NR soil, while that of the same in R soil was greatest (0.785 mg kg−1) with Mannitol–calcium chloride (CaCl2) (MCC) followed by hot -CaCl2 (HCC, 0.750 mg kg−1) in the treatment T4 where NPK (80:40:40), B at 0.5 kg ha−1, and farmyard manure (FYM) at 5 t ha−1 were applied together. Based on linear regressions and correlations between different extractants and yield responses, the MH-3 extractant gave the greatest value of co-efficient of determination (R2 = 0.36**, r = 0.598**) and has proved to be a superior extracting solution for B in NR in an Aeric Endoaquept. The results further suggested that the extractability of B with these three extractants did not have any control over rhizosphere soil zone.
Acknowledgment
The first author is grateful to M/S Aries Agro Service Ltd., Mumbai, for providing financial support in the form of a fellowship for carrying out the present investigation.