Abstract— The pratical use of different land use systems(LUS) as a management strategy and the effect of the LUSon soil proprties as an indicator of soil fertility status, and the understanding of the long-term effect of the LUS, are important to maintaining optimal soil fertility and yeild of crops. In the rain-fed wet lowlandtropical soils, studies related to rice production and the associated effectson soil properties are limited to a few studies. In this study, we investigated the effects of four LUS (crop rotation, continuous cropping, manure application and fallow) on soil properties that influence soil fertility status and yield of crops under a rain-fed wet lowland tropical sandy soil conditions.The data were compared with the natural soil data obtained prior to and at the end of the study. All the LUS had no to small effects on bulk density, moisture content, electrical conductivity and pH.Soil organic carbon, total nitrogen, available phosphorus, extractable potassium, and cation exchange capacity were all higher in all the LUS.Crop rotation increased soil organic carbon and cation exchange capacity, fallow increased total nitrogen, and manure application increased available phosphorus and extractable potassium contents, respectively.The LUS had no significant effects on particle composition except that small increases in the silt contentswere observed in the continuous, rotation and fallow systems. In almost all cases, soil organic carbon content influenced the fertility status of the sandy soil and yield of rice. Higher soil organic carbon contentresulted in higher available phosphorous and extarvale potassium,enhence reulted in higher yield of rice but decreased the total nitrogen content.Our results implied that the soil organic carbon content of sandy soils needs to be managed properly for optimal soil fertility and higher yieid.
Keywords— land use systems, soil fertility, yield of rice, rain-fed, sandy soil.
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