Studies on soil organic carbon and organic nitrogen fractions under different land use systems of Haryana
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Date
2016
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Publisher
CCSHAU
Abstract
A study on soil organic carbon and organic nitrogen fractions under different land use system
of Haryana was carried out to evaluate the changes in soil quality caused by different land use systems
at Department of Soil Science CCS HAU, Hisar. Different land use systems viz., cotton-wheat, ricewheat,
sugarcane-sugarcane pearl millet-wheat (zero tillage), pearl millet-wheat (conventional tillage),
citrus orchard, guava orchard and vegetables along with their uncultivated soils were selected for the
study. Soil samples replicated five times were selected from each land use systems along with their
uncultivated soils and analyzed for organic carbon and organic nitrogen fractions, available nutrients,
pH, EC and CEC. The total organic carbon was found highest under horticulture land use system and
highest content (9.72 g kg-1) was found in guava orchard, however, lowest 4.84 g kg-1 was observed
under pearl millet-wheat land use system. About 39.66% higher organic carbon was observed under
cultivated soils as compared to uncultivated soils. The highest microbial biomass carbon, light fraction
carbon and heavy fraction carbon content was observed under guava orchard i.e. 238.14 mg kg-1, 1.76 g
kg-1 and 7.51 g kg-1 ,while highest DOC content (386.00 mg kg-1 ) was found under cotton-wheat
cropping system. Similarly, total hydrolysable nitrogen, amino acid-N, amino sugar-N, ammonia-N and
hydrolysable unknown-N fractions of organic nitrogen found to vary as 347.20-1003.20, 133.20-
273.00, 74.60-165.60, 175.8-245.80, 71.00-372.00 and 170.90-576.4 mg kg-1 under different land use
system in cultivated soils. All these fractions of organic nitrogen found higher under guava orchard
while ammonia-N was noticed higher under sugarcane-sugarcane land use system. Both the organic
carbon and organic nitrogen fractions were found higher in cultivated soils than uncultivated soil
except dissolved organic carbon. Available nitrogen, phosphorus and sulphur was observed (26.92 %,
80.70 % and 150.15 % higher, respectively) higher in cultivated soils than uncultivated soils while
potassium followed the reverse order having 34.66% lower content in cultivated soils. Zinc, iron and
copper micronutrients content was found higher under cultivated soils than uncultivated soils while Mn
content was noticed higher under uncultivated soils. Higher amount of manganese was observed under
cotton-wheat, rice-wheat, sugarcane-sugarcane and pearl millet-wheat land use system in uncultivated
soils while pearl millet-wheat, citrus, guava and vegetable land use system showed higher Mn content
in cultivated soils. Available nutrient status of cultivated soils was observed higher where higher
amount of fertilizers and manures are in practices.
Description
Keywords
Organic carbon pools, Organic nitrogen fractions, Available nutrients, Land use systems, Cultivation