Abstract

Researh was carried out aimed to study the response of cocoa and coffee seedlings inoculated by Arbuscular Mycorrhizal Fungi (AMF) and applied with Ayamaru Phosphate Rock (APR). The research was cunducted at Bogor Agriculture Institute (IPB) and Papua University (Unipa) Manokwari Indonesia. Cocoa seed (Upper Amazone Hybrid F-1) and Arabica coffee seed (Coffea arabica) were collected from the Indonesian Coffee and Cocoa Research Institute (ICCI) Jember Indonesia. Cocoa dan coffee seedling were planted in polybag with acid soil medium, under 60% shading net. Cocoa and coffee seedlings were grown for 16 weeks after planting. AMF inoculum used Mycofer that was collected from IPB consisted of four species i.e Gigaspora margarita (INVAM-105), Glomus etunicatum (NPI-126), (Acaulospora tuberculata (INDO-2), Glomus manihotis (INDO-1) and indigenous AMF Manokwari consisted of three species i.e A. tuberculata Janos & Trappe, A. scrobiculata Trappe, and G. aggregatum Schenck & Smith. Ayamaru Phosphate Rock (APR) was collected from Ayamaru District, West Papua, Indonesia. The result showed that the growth of cocoa seedling applied with APR up to 4 g P₂O₅.seedling^-1 and the growth of coffee seedling applied with APR up to 8 g P₂O₅.seedling^-1 increased linearly. Compared to control (without AMF), inoculation of AMF Mycofer increased the cocoa seedling’s height up to 50.58% and shoot dry-weight 127.55%, whereas height of coffee seedling increased by 27.29% and shoot dry-weight by 121.21%. For all APR dosage, the growth of cocoa and coffee seedling inoculated with AMF Mycofer inoculum was better than inoculated by indigenous AMF and without AMF (control).

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