Characterization of Various Kinds, Thickness and Bentonite Sand Ratio as Hardplain Materials: a Basic Concept for Coastal Sandy Land Management

Journal of Tropical Soils

关键词: Bentonite ratio;    coastal sandy land;    microstructure;    mineral composition;    permeability;   

DOI  :  

来源: DOAJ

【 摘 要 】

Coastal sandy land developmentfacesthe sand characteristics, the lower holding water capacity and the larger nutrient leaching due to heavier rainfall in the tropics, soil porosityand without soil layering so it need alternative technologyformore efficientharvesting water resources insupportingthe crop growing. Thelaboratory research studied the characteristic of various kind, thickness and ratio of hardplain material was carried out at Laboratory of Agronomy of UNSOED,Soil Mechanic of GMU.the SEM and X-RD ofLemigas Jakarta. Permeability determination by Falling Head which is appropriate measurmentwas not significantly different with ELE28-290 permeameter. Permeability of Kokap clay soil andNanggulan bentonite were larger than therainfall intensity in coastal sandy land.The Sentolo Vertisol content 68% calcium smectite had permeability 3,7 mm.day-1.Bentonite permeability were not significantly different due to more than 80% clay mineral composition. Therefore the permeability of natrium bentonite like asBPIB andBLUB namely1.4 x 10-2 and 10-2mm day-1 were lower than the calcium bentonite like as RMBL and BLBKpermeability namely4.3 x 10-2and2.43 x 10-2 mm day-1. Permeability of 0.5 cm thickness bentonite was notsignificantly different than 1.0 dan 1.5 cm thickness and those had very low permeability. Bentonite sand mixture 15 and 20 percent produced bentonite sand agregatethathadmesopores by which allowing the drainage and available soil water so that those had water permeability 13.7 dan10.3 mm day-1 respectively.The mixture 30-100%had not significantly different permeability namely 7.3 x 10-2up to 1.4 10-2 mm day-1. The combination of tickness and the low ratio ofbentonite sand mixutre need to be determined to produce favourable environment in supportingthe plant growth.

【 授权许可】

Unknown