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Main Title: Organic wastes from bioenergy and ecological sanitation as a soil fertility improver: a field experiment in a tropical Andosol
Author(s): Krause, Ariane
Nehls, Thomas
George, Eckhard
Kaupenjohann, Martin
Type: Article
Language Code: en
Is Part Of: 10.14279/depositonce-8104
Abstract: Andosols require the regular application of phosphorus (P) to sustain crop productivity. On an Andosol in NW Tanzania, we studied the short-term effects of amending standard compost, biogas slurry and CaSa compost (containing biochar and sanitized human excreta) on (i) the soil's physico-chemical properties, on (ii) biomass growth and crop productivity, and on (iii) the plants' nutrient status. The practice-oriented experiment design included the intercropping of seven locally grown crop species planted on 9m2 plots with five repetitions arranged as a Latin rectangle. Differences in plant growth (biomass production and crop yield, e.g., of Zea mays) and crop nutrition (total C, N, P, K, Ca, Mg, Zn, etc.) were related to pH, CEC (cation exchange capacity), total C and the availability of nutrients (N, P, K, etc.) and water (water retention characteristics, bulk density, etc.) in the soil. None of the amendments had any significant effect on soil water availability, so the observed variations in crop yield and plant nutrition are attributed to nutrient availability. Applying CaSa compost increased the soil pH from 5.3 to 5.9 and the level of available P from 0.5 to 4.4mg per kg. Compared to the control, adding biogas slurry, standard compost and CaSa compost increased the aboveground biomass of Zea mays by, respectively, 140, 154 and 211%. The grain yields of maize on soil treated with biogas slurry, standard compost and CaSa compost were, respectively, 2.63, 3.18 and 4.40tha−1, compared to only 1.10tha−1 on unamended plots. All treatments enhanced crop productivity and increased the uptake of nutrients into the maize grains. The CaSa compost was most effective in mitigating P deficiency and soil acidification. We conclude that all treatments are viable as a substitute for synthetic fertilizers. Nevertheless, further steps are required to integrate the tested soil amendments into farm-scale nutrient management and to balance the additions and removals of nutrients, so that the cycle can be closed.
Issue Date: 2016
Date Available: 11-Apr-2019
DDC Class: 629 Andere Fachrichtungen der Ingenieurwissenschaften
577 Ökologie
Subject(s): organic waste
ecological sanitation
soil improvement
soil fertility management
organischer Abfall
ökologische Sanitärversorgung
Journal Title: Soil
Publisher: Copernicus Publ.
Publisher Place: Göttingen
Volume: 2
Publisher DOI: 10.5194/soil-2-147-2016
Page Start: 147
Page End: 162
EISSN: 2199-398X
ISSN: 2199-3971
Appears in Collections:FG Umweltprüfung und Umweltplanung » Publications

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