Manaf, F. ., Ismail, R. ., & Sukor, A. S. A. . (2022). Effect of Different Nitrogen Percentage Input On Soil Fertility, Plant Nutrients and Yield of Organic Spinach (Amaranthus Spp.). Research in Agriculture Livestock and Fisheries, 9(2), 135–144. https://doi.org/10.3329/ralf.v9i2.61619