The germination process of arabica coffee bean takes a fairly longtime, due to semi-permeable skin against water. Dormancy treatment needs to improve germination rate of coffee beans before planting. The research was conducted at The Compost Centre of Agriculture Faculty, University of Sumatera Utara from July – September 2018 using a Randomized Complex Design (RCD) non-factorial with 5 treatments, i.e. P0 (Control), P1 (Stripping Bark Horn), P2 (Soaking in KNO3 0,5% 24 hours), P3 (Soaking in Sitokinin 1,5 ml/lt 24 hours), P4 (Soaking in Coconut water5days). The parameters observed were potential to grow, germination rate, vigor rate, germination speed index, normal sprout percentage, and death percentage. The result showed that stripping coffee beans had statistically significant increase on potential to grow, germination rate, vigor rate, germination speed index, normal sprout percentage and decrease on death percentage.

Soursop (Annona Muricata Linn.) is a plant that has hard seeds that inhibits germination. One way that can be done to accelerate the process of germination of soursop is by scarifying and using natural growth regulators. This research aim was to identify the effect of scarification and immersion of natural growth regulators on the viability of soursop seeds. This research was conducted at the USU Faculty of Agriculture from July to September 2018 by using a Completely Randomized Design of two treatment factors namely, (1) Scarification (without scarification / control and scarification) and (2) Immersion of Natural Growth Regulators (No Immersion / Control, Immersion with young coconut water; red onion extract and young coconut water). The scarification treatment and immersion of young coconut water and/or red onion extract gave the highest yield, significantly on plant height, leaf number and vigor index.