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Abstract
Laterite soil is one of natural resources in East Kotawaringin regency, Central Kalimantan, Indonesia, which contains high element of Fe. Fe is one of micronutrients that is needed for plant in slight amount. This study aims to determine the effect of chitosan composition and composition of zeolite : laterite on the release of Fe activities from synthesized fertilizers result. Laterite is characterized by using XRF and XRD. Slow release iron fertilizer is synthesized by eliciting laterite to zeolite matrix. Then, It is stirred into chitosan gel with concentration of 2, 2.6, and 2.8 % for 30 minutes. After Zeolite - laterite - chitosan has been homogenized, then it is dropped into 0.4 M NaOH to form beads. Then testing the release of Fe with the batch method in distilled water. The result showed that the laterite soil is amorphous form, and Fe content reached 80.25 % . The higher the concentration of chitosan which is used , then more Fe is released from fertilizer. Whereas if the amount of zeolite is greater, the slower the release of Fe will be.
Highlights
The formation of mineral by nature obtained many type of rocks such as metamorph, bauxite, sediment, pyroclastic, and laterite
Laterite is characterized using X-ray Fluorescence (XRF), XRF result represents the highest compound of laterite East Kotawaringin is iron (Table 1)
Laterite characterized by X-Ray Diffraction (XRD) to determine crystal structure
Summary
The formation of mineral by nature obtained many type of rocks such as metamorph, bauxite, sediment, pyroclastic, and laterite. Many places in Indonesia that the soil contained laterite mineral and Indonesia was the second largest country which has laterite content in those soil. Primary compound of laterite was iron, aluminium, and silica (Prasetiyo, 2008). The highest amount of iron in laterite could utilize to fulfilled micronutrients for plants. Iron has function as catalyst for synthesis of chlorophyll and helping transport system. The amount of iron which needed by plants was 100 mg/L (ppm) per day, but it's depend on type and age of their
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