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Purwaningrum, Y., Asbur, Y., Satriawan, H., Sari, M. and Nurhayati 2023. Combination of exploitation systems to optimize yield of GT1 clone in smallholder rubber (Hevea brasiliensis) plantation in Sumatera Utara, Indonesia. Plant Science Today. 10, 4 (Aug. 2023). DOI:https://doi.org/10.14719/pst.2491.