| Abstrakt: |
As one of the provinces in Eastern Indonesia, West Nusa Tenggara Province has a vast dry land potential of almost 161.874 ha spread over the southern, eastern, and northern parts of Lombok Island, while on Sumbawa Island, it is distributed in all districts. In general, the dry land irrigations are limited rain and soil texture. The texture of dry land irrigated soil on the island of Lombok is generally sandy, so the productivity is very high. The ability of the soil to hold water is deficient, and the time to bind soil moisture is short. Likewise, the rain intensity of dry land irrigation on Lombok Island is very short, causing the low success rate of dry land irrigation agricultural production is very low. To increase the ability of porous soils their resistance to irrigation water efforts to improve soil texture by replacing the sandy porous soil layer by replacing or mixing the porous soil in the root zone with fine-grained soil. The research design was carried out in a laboratory with experimental modeling. Modeling is done by mixing porous soil with fine-grained soil in several portions of the mixture. Furthermore, rainfall modeling was carried out with several variations of rain intensity and measurements of soil moisture and runoff were carried out both through the surface and below the surface. The composition of the soils mixture used is 25% and 50%. Rain is simulated with 20 minutes, 40 minutes, and 60 minutes of rain duration. The modeling results show that mixing porous soil with fine-grained soil can increase soil moisture and water-binding time in the root zone is longer. For the percentage of fine-textured soil 25% with a rain duration of 20 minutes, the humidity can be increased to 48.25%, for 40 minutes, the moisture rises to 52.50%, and at a rain duration of 60 minutes, the humidity increases to 50.94%. [ABSTRACT FROM AUTHOR] |
