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Distribution of N-mineralizing Enzymes in Soil Aggregate Fractions over 46 Years Application of Inorganic and Organic Fertilizers in a Tropical Rice-Rice System

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Title Distribution of N-mineralizing Enzymes in Soil Aggregate Fractions over 46 Years Application of Inorganic and Organic Fertilizers in a Tropical Rice-Rice System
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Creator Priyadarshini, P., Tripathi, R., Puree, C., Dhal, B., Shahid, M., Lal, B., Gautam, P., Mohanty, S., Kumar, U., Munda, S., Kumar, A., Panda, B.B., Bhattacharyya, P., Shukla, A.K., and Nayak, A.K.
 
Subject Nitrogen mineralization, soil enzymes, soil aggregate, physical fractionation, farmyard manure
 
Description Not Available
The stability of enzymes in soil has been attributed to enzyme association with organic matter and the
protection provided within soil aggregates. Enzymes namely urease, amidase and protease significantly
affects nitrogen (N) mineralization and their assessment is crucial to study the nutrient cycling. Therefore,
the objective of this study was to evaluate the hypothesis that the long-term application of farmyard manure
(FYM) and inorganic fertilizers (N-nitrogen; P-phosphorus; K-potassium) impact the distribution pattern of
enzymes namely, urease, amidase and protease in different fractions of water stable soil aggregates, and
whole soil at 0-15 cm and 15-30 cm soil depth. The treatments comprised of unfertilized control and
different combinations of inorganic fertilizers and FYM viz. control, N, NP, NK, NPK, FYM, FYM+N,
FYM+NP, FYM+NK and FYM+NPK. A significant difference in soil aggregate size distribution was
observed at two sampling depths. Total water stable aggregates (WSA) ranged between 69.8-91.2% in
which 0.1-0.053 mm aggregate fraction contributed (2.11-3.87%), whereas 0.25-0.5 mm aggregate fraction
was having the highest (27.3-32.6%) contribution. The activities of three enzymes in whole soil as well in
aggregate fractions were lowest in control and highest in FYM+NPK except for amidase, which was having
highest activity in FYM alone treatment. Activities of all the three enzymes were highest in aggregate
fraction of 5-2 mm. Activities of three enzymes in whole soil as well as in aggregate fractions were lower
at 15-30 cm compared to 0-15 cm soil depth. It may be concluded from this study that long-term addition of
FYM alone or in combination with inorganic fertilizer increases the macroaggregate (5-2 mm) and hence
the overall activities of N mineralization enzymes.
ICAR
 
Date 2021-01-01T11:16:26Z
2021-01-01T11:16:26Z
2019-09-09
 
Type Research Paper
 
Identifier Priyadarshini, P., Tripathi, R., Puree, C., Dhal, B., Shahid, M., Lal, B., Gautam, P., Mohanty, S., Kumar, U., Munda, S., Kumar, A., Panda, B.B., Bhattacharyya, P., Shukla, A.K., and Nayak, A.K., 2020. Distribution of N-mineralizing Enzymes in Soil Aggregate Fractions over 46 Years Application of Inorganic and Organic Fertilizers in a Tropical Rice-Rice System. Journal of the Indian Society of Soil Science, 67(3), pp.341-350.
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http://krishi.icar.gov.in/jspui/handle/123456789/44392
 
Language English
 
Relation Not Available;
 
Publisher Journal of the Indian Society of Soil Science