![]() The aggradation index has increased from banana field (14%), agroforestry system (37%) and legume field (38%). On average, degradation index in cassava field was 11%. Agroforestry system has maintained higher soil C and N levels than the other fields. Conversion to legume fields and agroforestry significantly increased all the soil properties tested. Conversion to banana field only lowered C organic about 6% and soil microbial biomass C up to 8%. Result shows that 6-year of cassava cultivation decreased 35% of soil water content at field capacity, 23% of water holding capacity, 11% of porosity, 13% of organic C and microbial biomass C, 32% of inorganic N and 10% of mineralizable C. We used five different land management practices such as Imperata cylindrica dominated grassland as a reference, cassava field, banana field, legume field and agroforestry. Undisturbed and disturbed soil samples were collected from Bengkulu Province, Sumatra, Indonesia. ![]() This has increased the need to assess the effect of grassland conversion to agricultural fields on soil. Ihsan Imperata grassland is recognized as environmental threats causing low land productivity.
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