Analysis of the effect of seed growth (Rhizophora apiculata) on the distance of land from the beach in of Pulau Sembilan Pangkalan Susu District Langkat Regency

Mangrove is a renewable resource that provides services related to the environment, such as abrasion protection, seawater control of incursion, reduction of sea wave height and speed, cleaning of water contaminants, among others, important to support living beings. Its objectives include to study and evaluate the impact of planting distance from the beach which is useful for increasing growth for mangrove ecosystem type Rhizophora apiculata and this study based on a complete randomized design (RAL) with treatment distance (J) consisting of 5 treatments (a) P0 (planting distance from the beach 41 meters), (b) P1 (planting distance from the beach 42 meters), (c) P2 (planting distance from the beach 43 meters), (d) P3 (distance from the beach 44 meters) (e) P4 (planting distance from the beach 45 meters). The percentage of plant growth is 100%. Observational Data on the measurement of height, diameter, leaf count, leaf size, and leaf area, that the treatment at planting distance can increase the growth of seedlings R. apiculata. Based on the results of the study the effect of planting distance on R. apiculata obtained in the treatment of P2 (planting distance from the beach 43 m) a seedling height value that was highest growth with a value of 198.0 cm or average 33.0 cm. The highest value of plant diameter obtained from the treatment of P3 (spacing 44 m) with a value of 7.74 mm or average 1.29 mm . The highest added value was found in treatment P1 with a value total number of 39.2 strands or average 6.5 strands. The increase in leaf area is 50.9 cm or average 8.4 cm which is found in the P2 treatment.