Year: 2014 | Month: September | Volume 7 | Issue 3
Nutrient Release Pattern of Different Boron Fractions in Maize Growing Sandy Loam Soils
Abstract:
An understanding of soil boron occurring in various forms and their release behaviour in soils needs to be examined extensively in major soil series. A laboratory incubation study was conducted to study the release pattern of boron fractions under maize growing sandy loam B deficit soils with different levels of B as 0, 0.5, 1.0, 1.5 and 2.0 kg ha-1 were replicated thrice in a completely randomized design. The soils were incubated at field capacity for a month (30 days) period and destructive sampling was done at intervals viz., 0, 7, 15, 21 and 30 days after incubation. B fractions viz., specifically adsorbed, oxide bound, organically bound and residual B in soil were determined. The results revealed that with applied boron, the non-specifically adsorbed B fraction was higher next to residual form when compared to other forms of boron. Applied B converted to soluble form and attained peak values at 21 days after incubation in the treatment with application of 2 kg B ha-1 and thereafter a decrease was noted. Irrespective of location, the plant available form of B includes non- specifically adsorbed B fraction which was considerably higher (1.03 and 1.0 mg kg-1 mg kg-1) on 21st day after incubation (contributed towards 0.02 and 0.01% of total B) which coincides with the high demand for B by maize crop during vegetative phase. The data’s also revealed that the contribution of residual boron to total boron was the highest among the B fractions.
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