Back U. R. Sangakkara
Department of Crop Science, University of Peradeniya, Sri Lanka
Full Paper (PDF File: 259KB)
Abstract
A comprehensive research program was initiated in 1990 to identify the
benefits of Effective Microorganisms (EM) on the productivity of organic
systems. Leaves of Gliricidia sepium and rice straw, which have different
C:N ratios and are commonly available, were used as sources of organic
matter. In addition, suitable controls were maintained in order to determine
the beneficial effects of EM. Yields of legumes were enhanced with EM to
a greater extent than non-legumes. The beneficial impact of EM was also
greater with Gliricidia which had a lower C:N ratio. EM applied to the
bare soil also produced some yield stability. In contrast, EM did not influence
yields of chemically-fertilized crops. The benefits of EM were greater
in a wet season. EM and organic matter enhanced selected soil physical
characteristics over the three years of the study. Possible causes of the
effectiveness of EM on the enhancement of soil properties are discussed.