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Nitrogen mineralization in a Vertisol from organic manures, green manures and crop residues in relation to their quality

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Title Nitrogen mineralization in a Vertisol from organic manures, green manures and crop residues in relation to their quality
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Creator 8. Sammi Reddy, K., Mohanty, M., Rao, D.L.N., Singh, M., Dalal, R.C., Suuba Rao, A, Pandey, M. and Menzies, N.
 
Subject Nitrogen mineralization, organic manures, green manures, crop residues vertisol,
 
Description Not Available
The nitrogen (N) mineralization characteristics of organic manures,
green manures and crop residues in relation to their quality were investigated in a
Vertisol. The proportion of N mineralized from different organic materials ranged from
-28% in wheat straw to 95% in gliricidia. The N release from good quality materials
(green manures & poultry manure) having C:N ratio of 12 to 14:1 was fast. Whereas the
organic materials (farmyard manure, soybean and chickpea straw) with intermediate
quality having C:N ratio of 29 to 33:1 resulted in immobilization of N during the first 6
weeks of incubation and subsequent release of mineral N from 8 to 16 weeks of incubation.
Addition of urea with these materials to raise the N content of the materials to 2%,
and narrow the C:N ratio to 18 to 22:1, resulted in net mineralization of N from the first
week onwards. Addition of poor quality wheat straw with a C:N ratio of 79:1 resulted in
a marked decrease in mineral N, due to immobilization of N, throughout the incubation
period. Addition of urea N to bring down the C:N ratio to 22 helped in faster mineralization
of N from the wheat straw + urea mixture. Correlations between quality parameters
of the organic materials and the proportion of N mineralized at 4, 8, 12 and 16 weeks
after incubation showed that N mineralization was strongly influenced by N content and
C:N ratio of the organic materials. In contrast, lignin and polyphenol contents had no
effect on mineralization, but ratios of lignin/polyphenol, polyphenol/N, and
lignin+polyphenol/N had significant negative relationships with N mineralization
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Date 2021-08-25T04:31:51Z
2021-08-25T04:31:51Z
2008-06-01
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/60393
 
Language English
 
Relation Not Available;
 
Publisher Not Available