EFFECT OF HUMIC ACID ON SOIL PROPERTIES, GROWTH AND YIELD OF FINGER MILLET IN SOILS OF LONG TERM FERTILIZER EXPERIMENT
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Date
2018-09-27
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
A greenhouse experiment was conducted during 2017 in Department of Soil
Science and Agricultural Chemistry, GKVK, Bengaluru to study the effect of humic acid
on soil properties, growth and yield of finger millet in soils of long term fertilizer
experiment. Humic acid used in the study was characterized and found that C: N of the
humic acid was 14.46:1 and total acidity was 5.46 meq g-1. The experiment was laid out
in completely randomized factorial design with 22 treatment combination. The results
revealed that significantly higher yield was obtained with the treatment receiving 100 %
NPK + FYM + lime along with humic acid i.e. 21.35 g pot-1 grain and 31.25 g pot-1 straw
yield, respectively. Significantly higher nutrient uptake was recorded in 100 % NPK +
FYM + lime along with humic acid. Among the available nutrients in soil, significantly
higher available phosphorus and micronutrients were recorded with application of
application of humic acid. With respect to fertilizer nutrient treatments, treatment
receiving 100 % NPK+ FYM+ lime recorded significantly higher available nutrient status
in soil. However, it was statistically on par with 100 % NPK + FYM application. Results
of the incubation studies indicated that, significantly higher available phosphorus was
recorded in humic acid applied treatment at 60 and 90 days after incubation. The humic
acid might have helped in solubilizing P from insoluble to soluble form resulting in its
increase. However, difference in available nitrogen and potassium content of soil was not
significant at different intervals of incubation.