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The research tested the degree of independence of two soil quality indicators for sugarcane plantations: the particulate organic matter (POM) content and earthworm density across five sites in Malang district, East Java. Sites reflected a gradient in average annual rainfall (1400-2500 mm/year) and two types of soil management: with and without organic input. Soil samples taken from a depth of 0-20 cm were analyzed for total organic C (TOC), total N (TN), POM-C, and POM-N and earthworm density and biomass. The TOC was corrected by the clay content using pedotransfer equations, so TOCref was obtained. The soils treated with organic input had higher TOC (18%), TN (28%), POM-C (70%), POM-N (64%), earthworm density (89%) and biomass (92%) than the soils without organic input. A statistically significant interaction was found between variation in annual rainfall and soil management types in their influence on TOC, TN, POM-C, POM-N, earthworm density and biomass. Increase in TOC, TOC/TOCref, and POM-C tend to be associated with increase in earthworm density (r=0.590;0.667;0.738) and biomass (r=0.622;0.732;0.581). As an easily measured indicator of biological soil health, POM-C is suited for monitoring soil quality in sugarcane plantations: earthworm density does provide additional information that may justify its regular measurement.

PARTICULATE ORGANIC MATTER AS A SOIL QUALITY INDICATOR OF SUGARCANE PLANTATIONS IN EAST JAVA