THE EFFECT OF THE ORIGIN LAND AND WATER RESOURCES ON THE FERTILITY OF LAND RICE FIELD IN MUSI RAWAS REGENCY, SOUTH SUMATRA PROVINCE, INDONESIAJ. Bimasri, D. Budianta3, Marsi and U. Harun
Paddy field (Sawah) is a leading producer of rice in Indonesia which is able to produce 51.2 million tons of grain/year or 95% of total grain production in Indonesia. The Intensive land uses generate in the depletion of the essential nutrients in soil due to transported at harvest. The nutrient contents of the soil tend to change depending on the season, forms and the soil management and the types of crop grown. This study aimed to determine the effect of origin of land and water resources on the Sawah soil fertility in Musi Rawas Regency-South Sumatra Province. The method used in this research were the survey method and the laboratory analysis. The durations of land uses of Sawah were classified into five groups which were 1- 20 years, 21-40 years, 41-60 years, 61-80 years and over 80 years. The soil samples were collected using the Belgi drill at a depth of 0-20 cm on a 10 point diagonally and then systematically composited and taken to 1000 g. The chemical components of soil which analyzed in this study consisted of pH, organic C, N-total, P-available, K-dd, Na, Ca, Mg and CEC. The results showed that Sawah in Musi Rawas Regency classified as Infertile soil because it had the low content of pH, N-total, base saturation and CEC. The content of organic C in The Rainfed Agriculture was low, the content of P-available in the fields derived from the dry land and the irrigated field was high. The chemical properties of Sawah which derived from the dry land and irrigated fields showed the better properties compared to the wetland and rainfed fields.
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