Abstract
Loss of soil organic matter can be caused by erosion triggered by soil compaction and high rainfall. The aims of the study were to determine (1) the loss of soil organic matter, lignocellulose, and soil microbial population due to erosion and (2) the contribution of organic matter from oil palm fronds. In the current study, the erosion plots were built on the accessible inter-row (gawangan hidup) and inaccessible inter-row (gawangan mati) of oil palm plantations located at the slope of 6-10% and >10%. Soil organic matter, lignin, cellulose, and hemicellulose contents and total soil microbial populations were measured in the sediments collected from the erosion plots. The results showed that the loss of organic matter was higher in the accessible inter-row than that in the inaccessible inter-row. The addition of lignin, cellulose, and hemicellulose from oil palm fronds into the soil are 2.06 Mg ha-1 yr-1, 1.13 Mg ha-1 yr-1 and 1.02 Mg ha-1 yr-1, respectively. Total bacterial population in the sediments taken from the accessible inter-row was higher than that from the inaccessible inter-row, while the total fungal population in the sediments from the inaccessible inter-row was higher than that from the accessible inter-row.
Highlights
To support the government on accelerating the development of the national economy in the agricultural sector, increasing agricultural production of food crops and plantation crops are needed
Sulawesi Island is an island that is potential as a priority area to develop food crops and to have a strategic role to support national food security
The purpose of the study was to obtain a landuse information to provide a characteristics of land resources through the identification and evaluation of potential land resources and that suitable for food crops in Mamuju district, West Sulawesi
Summary
To support the government on accelerating the development of the national economy in the agricultural sector, increasing agricultural production of food crops and plantation crops are needed. Increased agricultural production can be done with intensification and extension programs which are strongly associated with the potential and the availability of land resources. Intensification program can be conducted in the areas that have agricultural production centers such as Java, while the extension program can be conducted outside the java island because it still has enough potential of land resources and a relatively low population density. Sulawesi Island is an island that is potential as a priority area to develop food crops and to have a strategic role to support national food security. These areas should be directed as special areas that have ample potential land and undeveloped. Mamuju consists of 16 districts with a total area of 794,276 ha (BPS Prov Sulawesi Barat 2011).The population of the region was 336,973 people consisting of 173,413 men and 163,560 women
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