Sheep wool and leather waste as fertilizers in organic production of asparagus (Asparagus officinalis L.) / OVČJA VOLNA IN OSTRUŽKI USNJA KOT GNOJILI V EKOLOŠKI PRIDELAVI ŠPARGLJA (Asparagus officinalis L.)

Vončina, Andrej; Mihelič, R.

doi:10.2478/acas-2013-0015

Cited by 14 publications

(2 citation statements)

References 7 publications

(6 reference statements)

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“…Generally, the present field observations were supportive of our previous pot study. The preceding pot experiment (Vončina and Mihelič, 2013), supported the authors’ field observations where sheep wool proved to be a good source of N. Similarly, Galvez et al (2012) observed that in both field as well as laboratory studies a significant fraction of available N was released in the first 30 days after application.…”

Section: Resultssupporting

confidence: 64%

“…Fishery waste, feather meal and seabird guano showing mineralization (Hartz et al, 2010) had lower C/N ratios compared with Biolyzer (Hartz et al, 2010) showing immobilization. In yet another study authors observed mineralization and nitrification of organic N from sheep wool waste which was richer in organic N (over 5%) than manure and compost (Vončina and Mihelič, 2013). The C/N ratio of tithonia was lower than maize and thus had a quicker mineralization rate (Gentile et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

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Conversion of rural abattoir wastes to an organic fertilizer and its application in the field cultivation of tomato in India

Roy

Das

Debsarcar

et al. 2015

Renew. Agric. Food Syst.

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Sophisticated capital intensive waste-recycling technologies are unviable in small rural abattoirs in India due to low volume of wastes (principally blood and rumen digesta) generated and lack of infrastructural facilities. We report recycling of slaughterhouse wastes as an organic fertilizer, ‘bovine-blood-rumen-digesta-mixture’ (BBRDM). Bovine blood and rumen digesta were mixed in 3:1 ratio in a metallic container, boiled and stirred continuously till the mixture was largely free of water. The mass was sun-dried for 3 days to obtain the final product. BBRDM was applied for field cultivation of tomato (Lycopersicon esculentum L., local variety ‘Patharkuchi’) in West Bengal state (India) during 2012–13 and 2013–14. We compared tomato yields obtained with BBRDM (N:P2O5:K2O 30.36:1:5.75) and conventional inorganic fertilizers [diammonium phosphate (DAP), N:P2O5:K2O 18:46:0 + potash, N:P2O5:K2O 0:0:44]. BBRDM was applied at a higher rate compared with DAP + potash to meet the farmers’ desire for enhanced yields. 75 kg ha−1 was applied at the 2nd week while 150 kg ha−1 was applied at the 8th week after transplantation. Yields (total fruit weight) obtained from BBRDM-treated plants were higher in comparison with DAP + potash-fertilized plants by 46–48% as the former supplied 2.5 times more nitrogen (N) than the latter. The partial factor productivity of DAP + potash was 73–76% higher than BBRDM. Conversely, as BBRDM was produced through local entrepreneurship from slaughterhouse wastes, the cost of this organic product would be expected to be much lower than the commercial inorganic fertilizer. Furthermore, application of BBRDM negates the environmental cost of treating slaughterhouse effluent. Considering the same cost of applying 225 kg fertilizer ha−1, higher yield with BBRDM should result in greater potential revenue for the farmer compared with yields with DAP + potash. The C/N ratio of BBRDM is 4.8, having relatively high N content. Accordingly, rapid release of plant-available N was observed in BBRDM-fertilized soils. The temporal increase in soil NH4+may be attributed to lack of soil N immobilization. Local farmers are willing to accept the new fertilizer as a substitute for currently used chemical fertilizers.

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Section: Resultssupporting

confidence: 64%