Biology and Fertility of Soils · 1993
Effects of organic manure and NPK fertilization on earthworm activity in an Oxisol
Tiwari, S. C.
Abstract
The effects of fertilization with N, P, K, and organic manure (alone or in combination) on earthworm populations, biomass, and casting activity were measured in a cultivated soil (organic C 1.5%, annual rainfall 2000-2300 mm). These applications of fertilizer caused significant increases in earthworm numbers, biomass, and casts. N alone or in combination with P and K also influenced these earthworm parameters significantly. The inorganic NPK fertilizer in combination with organic manure had a significantly greater effect on earthworm activities than NPK fertilizer alone, and therefore the addition of organic matter appears advisable in order to obtain maximum benefits from NPK fertilizer in this soil.
Findings
What changed what, as the paper reports it. Grouped by the measured property.
earthworm population
↑ 4= 27
- increase
organic manure (partly decomposed cow dung), 10 x 10^3 kg/ha dry weight
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