Effect of green manure on soil organic matter content and nitrogen availability

Many green manure crops furnish a succeeding rice crop with N equivalent of 50 to more than 100 kg fertilizer N/ha. In several experiments, green manure had important effects on soil properties other than ability to supply N. In the long run, those effects may be economically more important than the...

Full description

Saved in:
Bibliographic Details
Main Author Bouldin, D.R
Format Conference Proceeding
LanguageEnglish
Published Los Banos, Laguna (Philippines) IRRI 1988
Subjects
ABONOS NITROGENADOS
ABONOS VERDES
DISPONIBILIDAD DE NUTRIENTES
ELEMENT NUTRITIF DISPONIBLE
ENGRAIS AZOTE
ENGRAIS VERT
FERTILIDAD DEL SUELO
FERTILITE DU SOL
MATERIA ORGANICA
MATIERE ORGANIQUE
ORYZA SATIVA
Online AccessGet more information

Cover

More Information
Summary:Many green manure crops furnish a succeeding rice crop with N equivalent of 50 to more than 100 kg fertilizer N/ha. In several experiments, green manure had important effects on soil properties other than ability to supply N. In the long run, those effects may be economically more important than the value of green manure as N source. As a first approximation, green manure contains two fractions: one decomposes during the first rice crop, the other decomposes slowly over several years. With most green manure crops, the first fraction is 50-80% of the total N. Residual effects (N supply to a second crop) are relatively small when green manure is applied only once, but the cumulative effects of several annual applications are expected to be appreciable. This review summarizes current knowledge on the effects of green manure on available N, soil organic matter, and soil productivity and presents a model of organic N availability.
Bibliography:8911396
F04