PEMANFAATAN KOMPOS KULIT KAYU MANGIUM UNTUK MEDIA PERTUMBUHAN CENDAWAN MIKORIZA ARBUSKULA DAN BIBIT Acacia mangium Willd.

Abstract

Sterilized and unsterilized mangium bark which added with activators and composted for 30 days were used as a growth medium for mycorrhizal fungi and Acacia mangium seedlings. Degradation rate of the bark was evaluated based on the changing content of organic carbon, total nitrogen, nutrient content, and its cation exchange capacity (CEC). Results showed that activators added on the composting process of mangium bark reducedC/Nratio to 21.90 in sterilized bark and 25.30 in the unsterilized, respectively. The addition of activators tended to increase the nutrient content i.e.N 0.82 -1.09%, P 0.22 -0.36%, and K 0.36 -1.12%, and increase the value of CEC into 31.3 to 32.7 me/100g. Mycorrhizal colonization on medium means that composted mangium bark can be used both as growth and mycorrhizal carrier media. Ahigh percentage of mycorrhizal colony was found in the medium made of sterilized mangium bark added with activators inoculated with Glomus sp. i.e. 45%. The growth rate of A. mangium seedling on the medium made of sterilized mangium bark added with activator tended to be higher than that of the unsterilized bark. The highest growth was found on medium inoculated with Gigaspora sp., while the largest stem diameter occurred on the medium inoculated with Glomus sp. Keywords: