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Kinetics of decomposition of un-conventional farm-based residues and their composting and quality monitoring

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Title Kinetics of decomposition of un-conventional farm-based residues and their composting and quality monitoring
Kinetics of decomposition of un-conventional farm-based residues and their composting and quality monitoring
 
Creator ICAR_CRIDA
 
Subject Residue decomposition, composting of unconventional farm‐based residues, castor and sunflower stalks, N fractions, total N, mineral N, total hydrolyzable N
 
Description Not Available
astor and sunflower, drought‐tolerant crops, are cultivated in the semi‐arid tropics of the world. The nutrient‐rich residues of these crops are mostly burnt because of their high C/N (C/N)‐ratios. These high C/N‐ratio residues can be composted and recycled successfully, if they are supplemented with other low C/N‐ratio farm‐based organics and some chemical additives. To study the rate kinetics and half‐life of decomposition of castor (C/N ratio: 75∶90) and sunflower (C/N ratio 57∶47) residue mixtures and the manure value of the compost thus prepared, two on‐farm experiments were conducted at Hayathnagar Research Farm (17° 18′ N latitude, 78° 36′ E longitude, and an elevation of 515 m above sea level) of Central Research Institute for Dryland Agriculture, Hyderabad, India. The decay rate constants obtained on the basis of the exponential functions using the data on weight loss, C concentration, and C/N ratios indicated that among the four combinations of treatments, castor stalks+gliricidia loppings+cattle dung had the fastest rate of decomposition with an average rate constant value of 0.0043 day−1. To achieve 50% decomposition (half‐life), the time periods computed for castor stalks+gliricidia loppings+cattle dung and sunflower stalks+gliricidia loppings+cattle were 197 and 278 days, respectively. On an average basis, sunflower‐based manure contained a significantly higher amount of total N (14.6 gm kg−1) than castor‐based manures (12.2 gm kg−1). The corresponding total hydrolyzable N values were 8.2 and 8.15 gm kg−1, respectively. Amino acid N was found to be the predominant constituent of the total acid hydrolyzable N in the manure. Use of earthworms in composting enriched the manure in terms of mineral [nitrate (NO3)+ammonium (NH4)‐N] and hexosamine‐N fractions. The full article deals with the decomposition patterns (periodical changes in weight loss, C concentration and C/N ratios), decay‐prediction functions, composting, and manure quality of the castor‐ and sunflower‐based residue mixtures.
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Date 2020-02-25T08:47:31Z
2020-02-25T08:47:31Z
2007
 
Type Technical Report
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/32827
 
Language English
 
Relation Not Available;
 
Publisher Sharma, K.L., Srinivas, K.,