Coffee waste as an alternative fertilizer with soil improving properties for sandy soils in humid tropical environments

Soil Use and Management - Tập 27 Số 1 - Trang 94-102 - 2011
Ruben Koy Kasongo1,2, Ann Verdoodt2, P. Kanyankagote1, Geert Baert2,3, Éric Van Ranst2
1Department of Earth Sciences, Laboratory of Soil Science, University of Kinshasa, BP 190 Kinshasa XI, DR Congo
2Department of Geology and Soil Science (WE13), Laboratory of Soil Science, Ghent University, Krijgslaan 281/S8, B-9000 Gent, Belgium
3Department of Plant Production, University College Gent, Voskenslaan 270, B-9000 Gent, Belgium

Tóm tắt

AbstractArenosols cover extensive areas in coffee producing, humid tropical countries of Sub‐Sahara Africa (Angola, DR Congo) and Southern America (Brazil). A laboratory experiment was undertaken to examine the potential of using coffee waste to improve the physico‐chemical properties of an Arenosol from DR Congo. The amendment was applied at three rates to the topsoil and incubated in soil columns at field moisture capacity for 24 months. A control without any amendment was integral to the completely randomized experimental design involving three replicates. The soil columns were watered weekly with an amount of distilled water approximating to 87% of the average rainfall. Every 3 months, the soil chemical properties and the fraction of leached water and cations were measured. All application rates raised soil pH above 5.5 within 3 months. Exchangeable Ca, Mg and K showed respectively, 5 to 7‐, 2 to 3‐ and 7 to 14‐fold increases with increasing application rates. Organic C and total N significantly increased within 6 months to ca. 1.5 and 0.12% respectively, inducing a decrease in the C/N ratio from 17 to 13. The combined action of increasing soil pH and organic C contributed to a significant increase in cation exchange capacity. Increases in available P were significant, but temporary, with maximum values attained at 9 months. Coffee waste application significantly increased the fraction of retained soil water from 53% to 60%. It promoted the retention of basic cations, immobilized Mn, but increased the mobility of Fe. Coffee waste has the potential to be used as a liming material, an NPK fertilizer and has the benefits also of increasing water and nutrient retention.

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Soil Use and Management

Tập 27 Số 1

94-102

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