Rusdiyana, Rusdiyana, et al. “The Influence of Liquid Organic Fertilizer from Peanut and Banana Peels Toward Vegetative Growth of Spinach ”. Jurnal Penelitian Pendidikan IPA, vol. 8, no. 2, Apr. 2022, pp. 528-33, doi:10.29303/jppipa.v8i2.1331.