Abstract. Large quantities of N fertilizers may be lost in rice fields by nitrification-denitrification. In this connection, experiments were carried out in order to compare the effects from slow-release N-fertilizers (ISODUR) and products integrated with diciandiamide (DCD), a nitrification inhibitor, with the N splitting method applied in two or three times on the rice growth and yield. The e...

Based on various characteristics of zeolite, its utilization in the manufacture of fertilizers with slow-release properties is possible. The objectives of this study are to characterize and utilized nitrogen, phosphorus and potassium (NPK) slow release fertilizer by using natural zeolite in Indonesia. In this research, zeolite was utilized as a mixture of Slow Release Fertilizer (SRF). Effect o...

One effort to reduce nitrogen loss is make the fertilizer in a form of slow-release. SRF method can be done conventionally based on centrifugal force. Nitrogen release from UZA fertilizers generally decreased during incubation period. Urea slow-release combination zeolite and humic acid applied soil media rate nitrate release. In this case, it necessary identify effect ready modifying acid. Inc...

Charcoal-based fertilizers can be improved in quality by nutrient impregnation and modified to provide nutrients gradually (slow release fertilizer-SRF). SRF fertilizer made using a coating the form of charcoal from pyrolysis palm oil waste. Raw waste Bantur District, Malang, East Java, for soaking process with fertilizers, there are two different types namely organic (EM4) inorganic (Urea) aft...

Abstract Two polyester-lignite composite coated urea slow-release fertilizers (SRFs; Poly3 and Poly5) were developed their physicochemical properties studied. Both these SRFs significantly (p < 0.05) extended the release compared to uncoated urea; Poly5 by 117 172 h, respectively. The characteristics of further enhanced linseed oil application (Poly5-linseed). SEM images demonstrated coating...