Simanjuntak, E., Prasetyo, P. and Hartal, H. 2018. The Effect of Local Organic Fertilizer from Rubber Processing Waste on the Yield of Rubber Plants. Akta Agrosia. 21, 1 (Jul. 2018), 25–28. DOI:https://doi.org/10.31186/aa.21.1.25-28.