Release of sulphate-sulphur, potassium, calcium and magnesium from spent mushroom compost under field conditions |
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Authors: | DPC Stewart K C Cameron I S Cornforth B E Main |
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Institution: | (1) AgResearch, c/o Soil and Physical Sciences, Box 84, Lincoln University, Canterbury, New Zealand e-mail: stewartd@lincoln.ac.nz Tel.: +64-3-3253888 Fax: +64-3-3253607, NZ;(2) Soil, Plant and Ecological Sciences, Box 84, Lincoln University, Canterbury, New Zealand, NZ;(3) Department of Soil Science, University of Reading, Whiteknights, PO Box 233, Reading, Berkshire, RG6 6DW, UK, GB |
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Abstract: | The release of SO4
2–-S, K+, Ca2+ and Mg2+ from soil amended with spent mushroom compost (SMC), a byproduct of mushroom production, was measured in leachate from field
lysimeters for 30 weeks. Rates of application were 0 and 80 t ha–1 moist SMC. The SMC contained 1.7% K, 6.5% Ca, 0.4% Mg and 1.2% S (of which 87% is SO4
2–-S), and has a C : S ratio of 26. The break-through curves of ion leaching were polymodal indicating the preservation of soil
structure in the lysimeters and its influence on leaching. SO4
2–-S release from SMC was rapid (first-order exponential) and was very similar to the release from a laboratory incubation.
The release of K+, Ca2+ and Mg2+ was described using first/zero-order models which were also used to describe their release in the laboratory. The rate and
amount of Ca2+ release was similar in the field and laboratory, but the amount of K+ (and to a lesser extent Mg2+) release was less in the field than in the laboratory. Recoveries of SMC applied nutrients in leachate were 80% of S (263 kg
ha–1), 3% of K (14 kg ha–1), 16% of Ca (284 kg ha–1) and 37% of Mg (40 kg ha–1). Little if any S was mineralised. Using SMC could provide plants with S, K, Ca and Mg but there is potential for SO4
2–-S losses via leaching.
Received: 7 April 1999 |
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Keywords: | Spent mushroom compost Soil Lysimeter Nutrient release Kinetic models |
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