Purwaningrum, Y., Asbur, Y. ., Kusbiantoro, D. . and Khairunisyah (2021) “Effect of Length and Up Ward Tapping on Physiology and Latex Yield on Rubber Plants RRIM 921”, Jurnal Online Pertanian Tropik, 8(1), pp. 59-66. doi: 10.32734/jopt.v8i1.6311.