摘要：Pupuk pelet berbahan dasar lumpur kolam ikan yang diperkaya dengan air kolam ikan dan pupuk kandang kambing dibuat untuk mengurangi kontaminasi nitrat di badan-badan air. Tujuan dari penelitian ini adalah untuk mengevaluasi perubahan beberapa sifat kimia tanah dan pola pelepasan nitrogen (N)-amonium (N-NH4+) dan N-nitrat (N-NO3-) pada Ultisol Darmaga yang diberi pupuk pelet. Dosis pupuk pelet yang diberikan ke dalam tanah adalah 6.10 g pelet/300 g tanah atau setara dengan 40.8ton pellet ha-1. Dosis pupuk pelet yang diberikan didasarkan pada dosis pupuk N tanaman jagung manis yaitu sebesar 200 kg N ha-1. Pot-pot percobaan tersebut diinkubasi selama 1 minggu, 2 minggu, 3 minggu, 4 minggu, 5 minggu, 6 minggu, 7 minggu, 8 minggu 10 minggu, dan 15 minggu pada kondisi kapasitas lapang. Analisis tanah dilakukan pada setiap akhir masa inkubasi. Hasil penelitian menunjukkan bahwa aplikasi pupuk pelet meningkatkan pH tanah, karbon organik, kapasitas tukar kation, basa-basa dapat dipertukarkan, N-NH4+ and N-NO3- dan total N-tersedia yang merupakan penjumlahan N-NH4+ and N-NO3-. Untuk pola pelepasan N-NH4+, dan N-NO3-, pada minggu 1 sampai minggu 7, N-NH4+ adalah bentuk N tersedia yang dominan akan tetapi menurun setelah itu. Penurunan N-NH4+ diikuti oleh kenaikan N-NO3-. Pada minggu 8 sampai minggu 15, N-NO3- adalah bentuk N tersedia yang paling dominan. Hasil penelitian merekomendasikan bahwa pupuk pelet berbahan dasar lumpur kolam ikan memperbaiki sifat tanah dan menyediakan N yang tersedia
其他摘要：Fishpond sediment-based pellet fertilizer enriched with fishpond water and goat manure was made to decrease load of nitrate contamination in water bodies. The objective of this research was to evaluate the changes of some soil chemical properties and the releasing pattern of nitrogen (N)-ammonium (N-NH4+) and N-nitrate (N-NO3-) in Ultisol Darmaga which was fertilized by pellet fertilizer. The rate of pellet fertilizer which was applied to the soil was 6.10 g of pellets/300 g of soil or equivalent to 40.8 ton of pellets ha-1. This rate was based on the amount of N fertilizer for sweet corn that was 200 kg N ha-1. The pots were incubated in 1 week, 2 weeks, 3 weeks, 4 weeks, 5 weeks, 6 weeks, 7 weeks, 8 weeks, 10 weeks, and 15 weeks at field capacity condition. Soil analyses were conducted after the end of each incubation period. The results showed that in the end of incubation period, the application of pellet fertilizer increased soil pH, organic carbon, cation exchange capacity, exchangeable bases, N-NH4+, and N-NO3- and total available N which is the total amount of N-NH4+, and N-NO3- compared to those of control soil. As for the releasing pattern of N-NH4+ and N-NO3-, in the 1 week to 7 weeks of incubation N-NH4+ was dominant and decreased after that. The decrease of N-NH4+ was followed by the increase of N-NO3-. The N-NO3- was dominant from 8 weeks to 15 weeks of incubation. The results recommended that fishpond sediment-based pellet fertilizer improved the soil properties and provided available N.
关键词：Ammonium; chemical properties; nitrate; pellet fertilizer
