Suparno, and Mashelin Wulandari. “The Effect of Fertilizer Concentration on the Growth of Land Kale (Ipomoea Reptans. Poir)”. Jurnal Penelitian Pendidikan IPA, vol. 9, no. 7, July 2023, pp. 5296-03, doi:10.29303/jppipa.v9i7.2835.