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dc.contributor.authorKrause, Ariane-
dc.contributor.authorRotter, Vera Susanne-
dc.description.abstractResidues from bioenergy and ecological sanitation (EcoSan) can be utilized to sustain soil fertility and productivity. With regard to certain cooking and sanitation technologies used in smallholder households (hh), we systematically analyzed how utilization of the respective potentials to recover residues for farming affects (i) soil nutrient balances, (ii) the potential for subsistence production of composts, and (iii) environmental emissions. On the example of an intercropping farming system in Karagwe, Tanzania, we studied specific farming practices including (1) current practices of using standard compost only; (2) a combination of using biogas slurry, urine, and standard compost; (3) a combination of using so-called “CaSa-compost” (containing biochar and sanitized human excreta, Project “Carbonization and Sanitation”), urine, and standard compost. The system analysis combines a soil nutrient balance (SNB) with material flow analysis (MFA). Currently, nitrogen (N) and phosphorus (P) are depleted by -54 ± 3 and -8 ± 1 kg·ha-1·year-1, respectively. Our analysis shows, however, a clear potential to reduce depletion rates of N, and to reverse the SNB of P, to bring about a positive outcome. Composts and biogas slurry supply sufficient P to crops, while urine effectively supplements N. By using resources recovered from cooking and sanitation, sufficient compost for subsistence farming may be produced. Human excreta contribute especially to total N and total P in CaSa-compost, whilst biochar recovered from cooking with microgasifier stoves adds to total carbon (C) and total P. We conclude that the combined recycling of household residues from cooking and from sanitation, and CaSa-compost in particular, is especially suitable for sustainable soil management, as it mitigates existing P-deficiency and soil acidity, and also restores soil organic matter.en
dc.description.sponsorshipDFG, 325093850, Open Access Publizieren 2017 - 2018 / Technische Universität Berlinde
dc.subject.ddc629 Andere Fachrichtungen der Ingenieurwissenschaftende
dc.subject.otherintegrated plant nutrient managementen
dc.subject.othercounteracting soil nutrient depletionen
dc.subject.otherbiogas slurryen
dc.subject.othercarbon recoveryen
dc.subject.otherecological sanitationen
dc.subject.othervegan organic farmingen
dc.titleRecycling Improves Soil Fertility Management in Smallholdings in Tanzaniaen
tub.publisher.universityorinstitutionTechnische Universität Berlinen
dcterms.bibliographicCitation.originalpublishernameMDPI AGen
Appears in Collections:FG Kreislaufwirtschaft und Recyclingtechnologie » Publications

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