Abstract

Fresh Organic Matter Application to Improve Aggregate Stability of Ultisols under Wet Tropical Region

Highlights

  • Aggregate stability of soils in wet tropical regions seem to be a key factor to determine soil degradation, especially in the sloping areas such as in West Sumatra

  • Some physical properties of Ultisol from wet tropical area especially in Limau, West Sumatera, are presented in Tabel 1. It shows that the soil had clay in texture with approximately 68% of particles

  • It is found to be true since the sampling site is located under wet tropical rainforest, receiving up to 6500 mm rainfall annually (Rasyidin 1994) and mean annual temperature > 18°C

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Summary

Introduction

Aggregate stability of soils in wet tropical regions seem to be a key factor to determine soil degradation, especially in the sloping areas such as in West Sumatra. Up to 6500 mm (Rasyidin 1994), combined with wavy and hilly topography in the region has caused the soils become very susceptable to degradation mainly through erosion process. This is primarily found under annual cropping systems, in which farmers during preparing seed bed, tend to cultivate the soils intensively that causing the SOM was oxidized.

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