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volume 27 issue 4 (december 2006) : 276 - 283
EXPLOITING THE NATURAL RESOURCE - LIGNITE HUMIC ACID IN AGRICULTURE - A REVIEW
1Department of Agronomy,
Tamil Nadu Agricultural University, COimbatore - 641 003, Tamil Nadu, India
ABSTRACT
Humic acid typically contains heterocyclic compowx:\s with carboxylic, phenolic, alcoholic
and carbonyl fractions extracted from lignite with high molecular weight. Humic acid has been
extracted from various sources such as lignite, peat, coal, farmyard manure, coirpith besides
natural persistence in soil. Humic acid plays a vital role in enhancing the nutrient uptake of crop
by acting as a chelate in mobilizing nutrients. Prevents losses of degradation and leaching of
nutrients and.thus reduces the use of inorganic fertilizers beSides increasing the efficiency of the
applied fertilizers. Presence of growth promotthg substances such as auxins and gibbereUins had
been reported in humic acid and it plays an important role in enhancing the enzymatic activities
of the plants. The resistance in the plants found to be increased by the humic acid application.
The soil fertility would be improved by mobilising the unavailable form of nutrients to the
available form. The humic acid application at optimal rates has been reported to enhance the
yield of various crops.
and carbonyl fractions extracted from lignite with high molecular weight. Humic acid has been
extracted from various sources such as lignite, peat, coal, farmyard manure, coirpith besides
natural persistence in soil. Humic acid plays a vital role in enhancing the nutrient uptake of crop
by acting as a chelate in mobilizing nutrients. Prevents losses of degradation and leaching of
nutrients and.thus reduces the use of inorganic fertilizers beSides increasing the efficiency of the
applied fertilizers. Presence of growth promotthg substances such as auxins and gibbereUins had
been reported in humic acid and it plays an important role in enhancing the enzymatic activities
of the plants. The resistance in the plants found to be increased by the humic acid application.
The soil fertility would be improved by mobilising the unavailable form of nutrients to the
available form. The humic acid application at optimal rates has been reported to enhance the
yield of various crops.
KEYWORDS
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