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Nutrient release from decomposing crop residues in soil: A laboratory experiment

Published online by Cambridge University Press:  30 October 2009

A. Scagnozzi ,
A. Saviozzi ,
R. Levi-Minzi  and
R. Riffaldi
A. Scagnozzi
Affiliation:
Soil Scientists, Institute of Agricultural Chemistry, University of Pisa, Via San Michele degli Scalzi 2, Pisa (56124), Italy.
A. Saviozzi
Affiliation:
Soil Scientists, Institute of Agricultural Chemistry, University of Pisa, Via San Michele degli Scalzi 2, Pisa (56124), Italy.
R. Levi-Minzi
Affiliation:
Soil Scientists, Institute of Agricultural Chemistry, University of Pisa, Via San Michele degli Scalzi 2, Pisa (56124), Italy.
R. Riffaldi
Affiliation:
Soil Scientists, Institute of Agricultural Chemistry, University of Pisa, Via San Michele degli Scalzi 2, Pisa (56124), Italy.
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Abstract

In a 400-day laboratory experiment, soil was amended with rape, sunflower and soybean residues to monitor the quantitative changes in the main inorganic nutrients. Total N, available P, exchangeable K+, Ca2+, and Mg2+ in all the amended samples increased significantly. Generally, the increase in the amounts of these nutrients was maintained until the end of the incubation period, suggesting that the mineralization of the three crop residues enhanced soil fertility. In amended soil samples, disappeared within 14 days, while available N was released as after 60 days in soybean-treated and after 120 days in rape- and sunflower-treated soil, respectively. Water-soluble P was completely lacking in each treatment because of microbial immobilization and adsorption or precipitation processes in soil.

Keywords

soil amendmentcrop residuesessential elementsrapesunflowersoybean
Type
Articles
Information
American Journal of Alternative Agriculture , Volume 12 , Issue 1 , March 1997 , pp. 10 - 13
Copyright
Copyright © Cambridge University Press 1997

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