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פותח על ידי קלירמאש פתרונות בע"מ -
Feather meal, a semi-slow release nitrogen fertilizer for organic farming
Year:
1994
Authors :
הדס, אביבה
;
.
קאוטסקי, לריסה
;
.
Volume :
38
Co-Authors:
Facilitators :
From page:
165
To page:
170
(
Total pages:
6
)
Abstract:

Plant nutrition in organic farming is based entirely on decomposition of organic materials, and release of excess N superfluous to the microbial population. Feather meal (FM), a by-product of the poultry processing industry, which contains 15% N as non-soluble keratin, is a potential organic N fertilizer. The objective of this study was to determine the rate of N mineralization and changes in microbial activity following the application of FM to soil. Soils were incubated with FM for 8 weeks at 30°C and optimal water content, and analyzed periodically for inorganic N, rate of CO2 evolution, counts of microbial populations, and activity of dehydrogenase and protease. Approximately 45, 55 and 65% of fertilizer N were released after 1, 2, and 8 weeks, respectively. Total number of bacteria increased due to the addition of FM after only 1 d, with a second pulse obtained at 14 d. Dehydrogenase activity followed a similar response cycling. Cellulose hydrolyzing bacteria and proteolitic bacteria increased later, between 5 and 21 d, probably due to secondary microbial decay products. Microbial biomass N at 5 to 7 d accounted for 10 to 14% of total FM-N, therefore the slow release of N from FM was due in part to its resistance to decomposition and in part to microbial biomass build-up and secondary decomposition.

Note:
Related Files :
feather meal
fertilizer application
nitrogen fertilizer
Organic farming
organic production
plant nutrition
Slow release
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More details
DOI :
https://doi.org/10.1007/BF00748776
Article number:
0
Affiliations:
Database:
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
51412
Last updated date:
02/03/2022 17:27
Creation date:
28/10/2020 15:47
Scientific Publication
Feather meal, a semi-slow release nitrogen fertilizer for organic farming
38
Feather meal, a semi-slow release nitrogen fertilizer for organic farming

Plant nutrition in organic farming is based entirely on decomposition of organic materials, and release of excess N superfluous to the microbial population. Feather meal (FM), a by-product of the poultry processing industry, which contains 15% N as non-soluble keratin, is a potential organic N fertilizer. The objective of this study was to determine the rate of N mineralization and changes in microbial activity following the application of FM to soil. Soils were incubated with FM for 8 weeks at 30°C and optimal water content, and analyzed periodically for inorganic N, rate of CO2 evolution, counts of microbial populations, and activity of dehydrogenase and protease. Approximately 45, 55 and 65% of fertilizer N were released after 1, 2, and 8 weeks, respectively. Total number of bacteria increased due to the addition of FM after only 1 d, with a second pulse obtained at 14 d. Dehydrogenase activity followed a similar response cycling. Cellulose hydrolyzing bacteria and proteolitic bacteria increased later, between 5 and 21 d, probably due to secondary microbial decay products. Microbial biomass N at 5 to 7 d accounted for 10 to 14% of total FM-N, therefore the slow release of N from FM was due in part to its resistance to decomposition and in part to microbial biomass build-up and secondary decomposition.

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