The growth of planted pulai (Alstonia scholaris) on ex-coal mine land in East Kalimantan

Abstract

Mawazin, Susilo A. 2016. The growth of planted pulai (Alstonia scholaris) on ex-coal mine land in East Kalimantan. Pros Sem Nas Masy Biodiv Indon 2: 237-242. Ex-coal mined land generally suffer impairment such as changes in physical and chemical properties of the soil, soil compaction, nutrient deficiencies, low pH, soil microbial reduction, changes in temperature and humidity, and unvegetated. Ex-coal mine reclamation activities require adaptable, fast-growing species which are able to improve soil physical and chemical properties. This study aims to determine the best fertilizer and effectiveness of fertilization on the growth of pulai (Alstonia scholaris) on ex-coal mined lands. The study consisted of three fertilizer treatments namely 2 kg Bokashi, a combination of Bokashi + NPK 25 g and 2 kg manure. The results showed that the best survival rate (91.5 %) of 8-month-old planted pulai was achieved by 2 kg Bokashi fertilizer treatment. Meanwhile, for16 and 24 months old planted pulai the best survival rate was achieved by 2 kg manure treatment at about 80.7 % and 71.7 % respectively. Treatment of 2 kg manure also give the best result of high growth for 8, 16 and 24 months old planted pulai by 95.35 cm, 106.87 cm, and 131.15 cm respectively. Furthermore, it also gives the best result of diameter growth for 8, 16, and 24 months planted pulai by 16.54 mm, 25.38 mm and 35.75 mm respectively.