Evaluation on maturity and stability of organic fertilisers in semi-arid Ethiopian Rift Valley

Abstract Case studies that have comprehensively examined local organic fertilisers (OFs) for their maturity and stability are rare in sub-Saharan Africa. Farmers in the semi-arid Ethiopian Rift Valley use indigenous compost (kosi) and household wastes for OFs. With the entry of fast compost that was...

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Autores principales:	Shiro Mukai, Wataru Oyanagi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/09adeeaf77054d9fb9c117ff57eca8ee
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spelling	oai:doaj.org-article:09adeeaf77054d9fb9c117ff57eca8ee2021-12-02T14:03:46ZEvaluation on maturity and stability of organic fertilisers in semi-arid Ethiopian Rift Valley10.1038/s41598-021-83611-42045-2322https://doaj.org/article/09adeeaf77054d9fb9c117ff57eca8ee2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83611-4https://doaj.org/toc/2045-2322Abstract Case studies that have comprehensively examined local organic fertilisers (OFs) for their maturity and stability are rare in sub-Saharan Africa. Farmers in the semi-arid Ethiopian Rift Valley use indigenous compost (kosi) and household wastes for OFs. With the entry of fast compost that was introduced by the administration, maturity and stability of these OFs were assessed. Their maturity was assessed by: monitoring pile temperature and volume, pH, organic matter and total nitrogen contents, and carbon to nitrogen ratio; determination of NO3 – to NH4 + ratio; and respirometric measurement of CO2 evolution. Their stability was assessed by weed seed germination tests and phytotoxicity bioassays. Weed seeds that were originally contained in the feedstock of the kosi and fast compost samples became inactive during the composting process. The CO2 evolution tests and phytotoxicity bioassays indicated a probable presence of some phytotoxic compounds in the kosi. Mature kosi and immature kosi in a kosi pile should be mixed before the field application. Some samples (15%) of the household wastes contained weed seeds. The combination of several assessment methods used in this study and determination methods for nitrogen components using RQ-flex is considered to be effective for on-site quality assessment of OFs in sub-Saharan Africa.Shiro MukaiWataru OyanagiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shiro Mukai Wataru Oyanagi Evaluation on maturity and stability of organic fertilisers in semi-arid Ethiopian Rift Valley
description	Abstract Case studies that have comprehensively examined local organic fertilisers (OFs) for their maturity and stability are rare in sub-Saharan Africa. Farmers in the semi-arid Ethiopian Rift Valley use indigenous compost (kosi) and household wastes for OFs. With the entry of fast compost that was introduced by the administration, maturity and stability of these OFs were assessed. Their maturity was assessed by: monitoring pile temperature and volume, pH, organic matter and total nitrogen contents, and carbon to nitrogen ratio; determination of NO3 – to NH4 + ratio; and respirometric measurement of CO2 evolution. Their stability was assessed by weed seed germination tests and phytotoxicity bioassays. Weed seeds that were originally contained in the feedstock of the kosi and fast compost samples became inactive during the composting process. The CO2 evolution tests and phytotoxicity bioassays indicated a probable presence of some phytotoxic compounds in the kosi. Mature kosi and immature kosi in a kosi pile should be mixed before the field application. Some samples (15%) of the household wastes contained weed seeds. The combination of several assessment methods used in this study and determination methods for nitrogen components using RQ-flex is considered to be effective for on-site quality assessment of OFs in sub-Saharan Africa.
format	article
author	Shiro Mukai Wataru Oyanagi
author_facet	Shiro Mukai Wataru Oyanagi
author_sort	Shiro Mukai
title	Evaluation on maturity and stability of organic fertilisers in semi-arid Ethiopian Rift Valley
title_short	Evaluation on maturity and stability of organic fertilisers in semi-arid Ethiopian Rift Valley
title_full	Evaluation on maturity and stability of organic fertilisers in semi-arid Ethiopian Rift Valley
title_fullStr	Evaluation on maturity and stability of organic fertilisers in semi-arid Ethiopian Rift Valley
title_full_unstemmed	Evaluation on maturity and stability of organic fertilisers in semi-arid Ethiopian Rift Valley
title_sort	evaluation on maturity and stability of organic fertilisers in semi-arid ethiopian rift valley
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/09adeeaf77054d9fb9c117ff57eca8ee
work_keys_str_mv	AT shiromukai evaluationonmaturityandstabilityoforganicfertilisersinsemiaridethiopianriftvalley AT wataruoyanagi evaluationonmaturityandstabilityoforganicfertilisersinsemiaridethiopianriftvalley
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Evaluation on maturity and stability of organic fertilisers in semi-arid Ethiopian Rift Valley

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