J. Sharma*, V.K. Dua, D. Kumar and
Division of Crop Production,
ICAR-Central Potato Research Institute,
Shimla-171 001, India
Author Email :
Aim: The present study
was conducted with an objective to assess the suitability of colemanite (Ca2
B6.O11.5H2O) as a slow release source of
boron to potato crop.
Methodology: Soil was
incubated with boron (1.25 and 2.50 mg kg-1 soil) using borax and
colemanite for six weeks. Soil moisture was maintained at 80% field capacity.
Soil samples were analyzed weekly for hot-water extractable boron content.
Direct and residual effects of borax and colemanite on potato plant growth
and boron uptake were studied in pot experiments. Leaf boron concentration
was measured by an ICP-OES.
Results: In laboratory
incubation, although the rate of release of hot water extractable boron from
colemanite was slower than borax, it was enough to meet the requirement of
potato crop. Application of both the sources of boron increased its content
significantly in soil as well as in potato leaves. This study revealed that
boron uptake from colemanite was comparable to borax in meeting the boron
requirement of potato.
Interpretation: Soil incubation
and pot experiment studies showed that colemanite is a suitable slow release
source of boron fertilizer for potatoes.
Key words: Borax, Boron, Colemanite, Potato, Soil incubation, Solanum
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