Irdika Mansur

Growth and Nutrient Status of Kayu Kuku [Pericopsis mooniana (Thw.) Thw] with Mycorrhiza in Soil Media of Nickel Post Mining Site

BACKGROUND Arbuscular Mycorrhizal Fungi are categorized as phytoremediant and increase the tolerance of plants under condition of heavy metal pollution. Effectiveness of AMF is determined very much by species of AMF, plant species and environmental condition. Therefore, testing the effect of local AMF on growth and absorption of nutrients and metal by Pericopsis mooniana planting stocks in growing media which are heavily polluted by heavy metal, need to be conducted. METHODOLOGY There were testing of 6 inoculums of local AMF which were isolated from rhizosphere of P. mooniana, namely AMF from district of Kolaka (Lamedai Nature Reserve, Tanggetada Natural Forest, Bali Jaya Village Plantation Forest and PT. Vale Indonesia Tbk) and from Kendari town (Campus environment of Halu Oleo University and Office of Southeast Sulawesi Governor). Besides the 6 local AMF, there were treatment without AMF (control) and treatment with mycofer as comparison. RESULTS Results showed that local AMF were effective in increasing growth and biomass of plants; absorption of C, N, P and K in three parts of the plants; Ca in stems and leaves and of Mg in leaf tissues; increasing formation of plants root nodules and were able to reduce Ni content in tissues of kayu kuku planting stocks. Effects of local AMF from Lamedai nature reserve and AMF from PT. Vale Indonesia were greater as compared with those of mycofer IPB. Content of Ni in kayu kuku plant tissue was found more in roots as shown by the value of TF<1. CONCLUSION Based on this study, kayu kuku is categorized as excluder species (TF<1) and moderate species toward Ni (>50 mg Ni/kg of plant dry weight) and possessed very high dependence on AMF (MIE >75%). Local AMF are potential to be developed as biological fertilizer to improve planting stocks for rehabilitation of degraded land.

Ukuran Diameter dan Takaran Vermikompos Menentukan Produksi Inokulan Fungi Mikoriza Arbuskula dan Biomassa Legum Penutup Tanah

Vermikompos merupakan pupuk organik yang diproduksi dengan bantuan sistem pencernaan dan mikrob dalam usus cacing tanah. Vermikompos diketahui berpengaruh positif terhadap pertumbuhan tanaman dan perkembangan simbiosis mikoriza. Penelitian ini bertujuan mencari ukuran diameter dan bobot vermikompos yang optimal untuk menghasilkan biomasa tanaman kudzu (P. phaseoloides Roxb) dan inokulum fungi mikoriza arbuskula (FMA) G. etunicatum NPI-126. Percobaan rumah kaca dilaksanakan dengan rancangan acak kelompok dengan kombinasi ukuran diameter dan bobot vermikompos sebagai perlakuan. Hasil percobaan menunjukkan bahwa vermikompos berpotensi positif sebagai pengganti pupuk buatan untuk meningkatkan produksi biomassa tanaman kudzu dan inokulum FMA G. etunicatum NPI-126. Vermikompos dengan ukuran diameter < 250 µm bobot 150–172 mg menghasilkan bobot kering akar dan kolonisasi FMA di akar tanaman kudzu serta jumlah spora G. etunicatum tertinggi dibandingkan perlakuan lainnya. Kolonisasi FMA di akar tanaman berkorelasi positif dengan jumlah spora G. etunicatum.