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Effects of humic substances from composted or chemically decomposed poplar sawdust on mineral nutrition of ryegrass

Published online by Cambridge University Press:  01 May 2000

R. A. BIDEGAIN ,
M. KAEMMERER ,
M. GUIRESSE ,
M. HAFIDI ,
F. REY ,
P. MORARD  and
J. C. REVEL
R. A. BIDEGAIN
Affiliation:
Laboratory of Agronomic Engineering, Ecole Nationale Supérieure Agronomique de Toulouse, Av. de l'Agrobiopole, Auzeville–Tolosane BP107–F31326, Castanet–Tolosane Cedex, France
M. KAEMMERER
Affiliation:
Laboratory of Agronomic Engineering, Ecole Nationale Supérieure Agronomique de Toulouse, Av. de l'Agrobiopole, Auzeville–Tolosane BP107–F31326, Castanet–Tolosane Cedex, France
M. GUIRESSE
Affiliation:
Laboratory of Agronomic Engineering, Ecole Nationale Supérieure Agronomique de Toulouse, Av. de l'Agrobiopole, Auzeville–Tolosane BP107–F31326, Castanet–Tolosane Cedex, France
M. HAFIDI
Affiliation:
Laboratory of Agronomic Engineering, Ecole Nationale Supérieure Agronomique de Toulouse, Av. de l'Agrobiopole, Auzeville–Tolosane BP107–F31326, Castanet–Tolosane Cedex, France Present address: Department of Biology, Faculty of Sciences, Marrakesh, Morocco.
F. REY
Affiliation:
Laboratory of Agronomic Engineering, Ecole Nationale Supérieure Agronomique de Toulouse, Av. de l'Agrobiopole, Auzeville–Tolosane BP107–F31326, Castanet–Tolosane Cedex, France Present address: Department of Physical and Organic Chemistry, University of Vigo, E-36208, Spain.
P. MORARD
Affiliation:
Laboratory of Agronomic Engineering, Ecole Nationale Supérieure Agronomique de Toulouse, Av. de l'Agrobiopole, Auzeville–Tolosane BP107–F31326, Castanet–Tolosane Cedex, France
J. C. REVEL
Affiliation:
Laboratory of Agronomic Engineering, Ecole Nationale Supérieure Agronomique de Toulouse, Av. de l'Agrobiopole, Auzeville–Tolosane BP107–F31326, Castanet–Tolosane Cedex, France
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Abstract

Two organic fertilizers were prepared from the same initial mixture of poplar sawdust, blood and flour either by composting in a reactor or by chemical oxidation. Both processes resulted in loss of c. 30% of the organic matter. Composting required 90 days in comparison to only a few hours with chemical oxidation. Extraction of the organic residues with 1 N KOH gave solutions containing 24·6 and 15·1 g/l of humic substances respectively. These humic solutions were applied to pot-grown Lolium multiflorum Lam. at 4 and 10 mg carbon per pot to assess the short-term uptake of macro and microelements by the plants. When the plants were short of phosphorus, the humic substances from the chemically decomposed sawdust supplied at 10 mg C per pot improved total P uptake and yield. Humic substances also increased copper and manganese uptake, and by enhancing root development, also improved nitrogen uptake and biomass yield.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 134 , Issue 3 , May 2000 , pp. 259 - 267
Copyright
© 2000 Cambridge University Press

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