The Effect of Coating Materials in a Slow-Release Urea-Organic Fertilizer Formula on Changes in Soil Chemical Properties and Nitrogen Availability: Pengaruh Bahan Pembungkus Formula Pupuk Lepas Lambat Urea-Organik Terhadap Perubahan Sifat Kimia Tanah dan Ketersediaan Hara Nitrogen . nabatia. 2025;13(2):116-125. doi:10.21070/nabatia.v5i2.1677