PLANTA TROPIKA

Back Matter Planta Tropika Vol. 13 No. 1

Planta Tropika — 2025-02-28

Front Matter Planta Tropika Vol.13 No.1

Planta Tropika — 2025-02-28

Effects of Biocontrol Product Bio P60 and Liquid Organic Fertilizer on The Development of Fusarium Wilt and Yield of Shallot

Loekas Soesanto — 2025-02-25

Shallot production is frequently threatened by Fusarium wilt. Chemical control has proven ineffective, highlighting the need for environmentally friendly alternatives such as the application of liquid organic fertilizer combined Bio P60. The study evaluated the effectiveness of the fertilizer and Bio P60 in controlling the disease and their impact on shallot growth and yield. A completely randomized block design with 16 treatments and three replicates was used, testing Bio P60 application (control, 20 mL per plant applied 1, 3, or 5 times) and the fertilizer (control, 3, 5, or 7 mL L⁻¹). Results showed that the five times application of Bio P60 significantly delayed the incubation period by 61.71%, suppressing disease incidence by 66.67% and reducing AUDPC by 69.84%. Bio 60 also increased plant height by 30.75%, number of leaves by 40.7%, number of bulbs by 75.6%, bulb fresh weight by 104.53%, blub dry weight by 51.1%, and total biomass compared to control. However, the fertilizer application has no significant effect on all variables, and no interaction was found between Bio P60 and the fertilizer. These findings suggest Bio P60 is an effective biocontrol agent for suppressing Fusarium wilt and improving shallot yield, offering a sustainable alternative to chemical treatments.

Assessing Soil Nutrient and Biomass Contributions to Peatland Formation

M. Edi Armanto — 2025-02-25

Peat formation is a key factor in carbon sequestration in Peat Swamp Forest (PSF). The study aims to analyze alternative pathways for peat formation based on soil nutrient availability and dried biomass accumulation. A randomized complete block design was used with two treatment factors across three blocks: (A) sampling plots representing land covers and (B) dried biomass levels. Data were analyzed using two-way ANOVA and Tukey Honestly Significant Difference (HSD) test at a 5 % significance level. Results showed a high supply of dried below-ground biomass did not correspond to increased rooting litter production under high soil nutrient conditions. Instead, most of the biomass was transported upwards into above-ground biomass. All land cover types generated above-ground biomass with significant differences in peat formation potential across all measured parameters. Peat formation was strongly influenced by land cover type (e.g., peat forest), environmental factors, seed bank composition, and species competition. Restoration strategies, including revegetation, rewetting, and revitalization, are crucial to promoting the establishment of peat-forming species. This research provides valuable insights for enhancing PSF restoration efforts and facilitating recovery toward a near-natural condition.