Abstract
The objectives of this study is to study formulation of PEG based alternative stimulant to increase latex production and physiologically safe for clones PB 260. This research was conducted at Sungei Putih Research Center, Rubber Research Center, Deli Serdang Regency, Province of North Sumatera and PTPD Paya Pinang, Tebing Tinggi, North Sumatera. The study uses 6 year-old of rubber clone PB 260 to determine differences in some parameter such as production (g/p/s), inorganic phosphate, sucrose and thiol levels. The results showed that stimulants have significant effect on production (g/p/s) and inorganic phosphate. PEG applications can encourage increased production (g/p/s) and inorganic phosphate. The combination of stimulant and PEG has very significant effect on production (g/p/s) and inorganic phosphate.
Highlights
Tapping is rubber tree harvesting to obtain maximum and sustainable production
High production can be achieved by appropriate exploitation system in rubber tree
Data of Latex production is measured by latex volume per tree and converted to dry production in grams per tree per tap (g/p/s) after multiplying by Total Solid Content (TSC)
Summary
Tapping is rubber tree harvesting to obtain maximum and sustainable production. Rubber trees are expected able to continuously produce latex without disturbance. In addition to stabilizing lutoid, the use of ethepon stimulant will increase pH in cytosol or known as alkalinization which affects latex stability and prevent (delay) coagulation, and when combined with adequate water supply causes longer latex flow[6]. Long term use of these stimulants can decline plant health and may trigger physiological stress due to excessive stimulation and not suitable with the clone characters. If this continues, it can cause dry tapping grooves which will decrease latex production[2]-[7]. Rahayu et al (2017) [7] found that PEG based alternative stimulants can increase latex production and not disrupt plant physiological conditions on 11 years old of clone PB 260. Research on PEG based alternative stimulants have been conducted on 6 years old of clone PB260
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