Susilaningsih, Sri Endah Prasetyowati. “Effect of Plastic Canopy and Type of Fertilizer on Nitrate Content and Growth of Spinach (Amaranthus Sp.)”. Agrivet 18, no. 1 (June 30, 2012): 33–38. Accessed March 7, 2026. https://jurnal.upnyk.ac.id/index.php/agrivet/article/view/4647.