Wahjuni Hartati
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EVALUASI DISTRIBUSI HARA TANAH DANTEGAKAN MANGIUM, SENGON DAN LEDA PADA AKHIR DAUR UNTUK KELESTARIAN PRODUKSI HUTAN TANAMAN DI UMR GOWA PT INHUTANI I UNIT III MAKASSAR. Hartati, Wahjuni
Hutan & Masyarakat Vol 3, No 2 (2008)
Publisher : Hutan & Masyarakat

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Abstract

The study aims to evaluate nutrient content and nutrient accumulation on above ground biomass and soil nutrient distribution and above ground biomass among the plantation forest stands.The study was carried out in Borisallo forest block of UMR Gowa of PT Inhutani I Unit III Makassar on forest stand plantation of mangium, sengon, and leda of 17 years of age and on virgin forest at Dystrustepts soil. The collected data were analysed descriptively.The study indicates that chemical characteristics of soil on leda stand is better than that of the virgin forest and the best of all other stands. Only the N content which is higher in the virgin stand than in any other stands in the plantation forest. The nutrient content of P, Ca, and Mg are higher in leda, whereas mangium has the highest content of K. Sengon has the least content of all observed nutrients. Mangium has the highest total biomass and nutrient accumulation (N, P, K, Ca, Mg) but sengon has the lowest. The accumulation of N, P, K of mangium is higher than the content found in the soil underneath the stand. On the contrary, Ca and Mg are found higher in the soil. Similar results are found in sengon and leda stands. Based on basal area and dominant height measurements the three-species plantations are considered low in productivity and categorised as site quality I. High clay concentration and soil depth are the main restrictions for good growth of stands and result in a low productivity of the three species stands. Key words: plantation,nutrient distribution,mangium,sengon,leda,sustainability
BIOCHAR YANG DIPRODUKSI DENGAN TUNGKU DRUM TERTUTUP RETORT MEMBERIKAN PERTUMBUHAN TANAMAN YANG LEBIH TINGGI (BIOCHAR PRODUCED BY RETORT CLOSED DRUM KILN PROMOTES HIGHER PLANT GROWTH RATE) Syahrinudin, Syahrinudin; Wijaya, Arya; Butarbutar, Tunggul; Hartati, Wahjuni; Ibrahim, Ibrahim; Sipayung, Maurit
ULIN: Jurnal Hutan Tropis Vol 2, No 1 (2018)
Publisher : Fakultas Kehutanan Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32522/u-jht.v2i1.1291

Abstract

ABSTRACTInterests on biochar application for the improvement of soil properties and fertily are increasing worldwide nowadays and numerous of production techniques are now available. This research was aimed at the investigation (a) on the characteristics biochar produced by 3 (three) different techniques, i.e: (1) traditional soil pit, (2) retort closed drum and (3) open drum kilns, as well as (b) on growth (height, leaf number and survival) response of Shorea leprosula seedling to 20%v biochar application on bioassay trial in the nursery. Bioassay trial was carried out in nursery of Forestry Faculty of Mulawarman University, Samarinda, Indonesia and was in accordance with Completely Randomized Design (CRD) applying 4 treatments and 3 replications.Of those 3 production techniques, retort closed drum kiln production technique was the most promising for further development and adoption providing not only that the biochar produced gave better properties and soil improvement capacity but also higher production recovery and less time and labour involvement. Furthermore, eventhough it was not statistically significant, biochar produced by retort closed drum gave better growth (height and leaf number) rate to S. leprosula seedlings in bioassay trial compared to those given by biochar produced by other techniques and without biochar treatments.