Tulin, Edgardo E. “EFFECT OF FERTILIZER APPLICATION ON THE YIELD AND PROTEIN CONTENT OF SOYBEAN HARVESTED AT VARIOUS STAGES OF MATURITY”. Annals of Tropical Research 5, no. 3&4 (December 9, 1983): 117–125. Accessed December 5, 2025. https://atr.vsu.edu.ph/article/view/726.