Purba, Tulus Roy Rasdian, R. Teguh Adi Prasetyo, Bambang Gonggo Murcitro, Abimanyu Dipo Nusantara, and Eko Suprijono. 2021. “Vermicompost of Cow Dung and Goat Manure to Increase N Absorption, Mustard (Brassica Rapa L) Growth and Yield in Ultisols”. TERRA : Journal of Land Restoration 4 (1):23-28. https://doi.org/10.31186/terra.4.1.23-28.