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All Journal Journal of Agribusiness and Local Wisdom Indonesian Journal of Forestry Research
Setyo Martono, Djoko
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Agriculture, Biological Sciences & Forestry Economics, Econometrics & Finance Environmental Science Social Sciences

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THE INFLUENCE OF STAND DENSITY AND SPECIES DIVERSITY INTO TIMBER PRODUCTION AND CARBON STOCK IN COMMUNITY FOREST Yudha Adi Putra Wirabuana, Pandu; Setiahadi, Rahmanta; Sadono, Ronggo; Lukito, Martin; Setyo Martono, Djoko
Indonesian Journal of Forestry Research Vol. 8 No. 1 (2021): Indonesian Journal of Forestry Research
Publisher : Association of Indonesian Forestry and Environment Researchers and Technicians

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59465/ijfr.2021.8.1.13-22

Abstract

Stand density and species diversity are two indicators that are highly related to forest productivity. However, the effect of those variables on the productivity of community forest is rarely documented. This study evaluates the influence of stand density and species diversity on timber production and carbon stock in the community forest. The study area was located in Madiun District. A field survey was conducted in four different community forest sites, i.e. Morang, Kuwiran, Randualas, and Kare. The sampling technique was by quadrat method using a sample plot size of 25 m x 25 m. The number of sample plots used in this study was 64 units, which were evenly distributed in every site. Comparison of stand attributes among sites was examined by Kruskal-Wallis test and followed by Kruskal-Nemenyi test on the effects of stand density and species diversity on timber production and carbon stock were assessed separately for each parameter using the generalized least square regression test. The process of statistical analysis was applied using a significance level of 5%. Results show a significant difference in stand volume, aboveground biomass, and carbon stock among sites (P<0.05). This study also recorded a meaningful effect of stand density and species diversity on timber production and carbon stock of community forest, wherein stand density provided a higher effect (R2 = 0.68; P<0.05) than species diversity (R2 = 0.26; P<0.05).
The Effect of Administering Humic Acid and Nasa POC Concentration on the Growth and Yield of Shallots (Allium Ascalonicum L.) Sulistiyo Budi, Luluk; Ari Wibowo, Agus; Setyo Martono, Djoko
JALOW | Journal of Agribusiness and Local Wisdom Vol. 9 No. 2 (2026): Journal of Agribusiness and Local Wisdom
Publisher : Program Studi Agribisnis bekerja sama dengan PERHEPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jalow.v9i2.52110

Abstract

This study aimed to examine the effect and interaction between the application of Humic Acid and the concentration of NASA liquid organic fertilizer (POC) on the growth and yield of shallots (Allium ascalonicum L.). This study was conducted from February to April 2025 in Sugihwaras Village, Saradan District, Madiun Regency using a factorial Randomized Block Design (RAK) with two factors: Humic Acid (A0 = 0 g/polybag, A1 = 2 g/polybag, A2 = 4 g/polybag) and NASA liquid organic fertilizer concentration (P1 = 2 ml/L, P2 = 5 ml/L, P3 = 8 ml/L). Each treatment combination was replicated three times, resulting in 27 plots with a total of 216 plants. The observed parameters included plant height, number of leaves, leaf area, number of tillers, number of bulbs, fresh bulb weight, dry bulb weight, and bulb diameter. Data were analyzed using ANOVA followed by a 5% DMRT test. The results of the study showed that there was an interaction between the treatment of Humic Acid administration and Nasa POC concentration on the parameters of plant height, number of leaves, number of tillers, number of tubers, wet weight of tubers, and dry weight of tubers, but there was no interaction on the parameters of leaf area and tuber diameter at the age of 40 HST. The highest average value was found in the treatment of 4 g Humic Acid administration and 8 ml Nasa POC concentration showing a higher average value compared to other treatments.
Co-Authors Ari Wibowo, Agus Luluk Sulistiyo Budi Martin Lukito Ronggo Sadono Setiahadi, Rahmanta Yudha Adi Putra Wirabuana, Pandu