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Journal : Journal of Tropical Soils

Changes in Soil Physical Properties Following Applications of Vermicompost Superimposed with Liquid Organic Fertilizer Hermawan, Bandi; Muktamar, Zainal; Fahrurrozi, Fahrurrozi; Setyowati, Nanik; Sujatmiko, Sigit; Chosin, Muhammad; Putri, Elsa Lolita
JOURNAL OF TROPICAL SOILS Vol. 29 No. 2: May 2024
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2024.v29i2.107-113

Abstract

Soil properties play essential roles in transmitting and holding precipitation water; therefore, they determine the amount of plant-available water in the soil profile. The study aimed to compare the size distributions of Andept soil pores following four-year applications of vermicompost and liquid organic fertilizer (LOF). The experiment was done from 2016 to 2019. The five doses of vermicompost (5, 10, 15, 20, and 25 Mg ha-1) set as the main factor, supplemented with 0 and 100 percent concentrations of LOF as a sub-factor, were arranged in a split-plot design with three replicates. Results showed that adding LOF decreased slow-drainage pores significantly when combined with 10 Mg ha-1 of vermicompost. However, the pore changes by LOF were not significant when applied to other doses of vermicompost. Applying vermicompost and LOF lowered the slow-drainage pores by increasing soil organic carbon and reducing soil particle density. The findings suggest that vermicompost and LOF act as soil ameliorants to reduce water loss by drainage from soil profiles. The study highlights the importance of soil properties in determining plant-available water in the soil profile.
Assessing the Impact of Terra Preta from Rice Husk on Soil, Rice Plant Growth, and Yield in the System of Rice Intensification (SRI) Adrinal, Adrinal; Gusmini; Putri, Elsa Lolita; Kasim, Musliar; Aprilia Herman, Violin Enghel
JOURNAL OF TROPICAL SOILS Vol. 30 No. 3: September 2025
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2025.v30i3.189-200

Abstract

The practice of intensive rice field cultivation and excessive chemical fertilizer use often leads to gradual declines in soil quality and fertility, as well as environmental pollution. By employing Tetadi as an ameliorant technology and adopting SRI cultivation techniques, we can mitigate the adverse effects on rice fields. This study aimed to examine the effects of Tetadi soil ameliorant on the physical properties of paddy soil, growth, and rice yield using the SRI method. The experiments were conducted in paddy fields in Pasar Ambacang, Kuranji, Padang city. Tetadi soil ameliorant was applied at A=0, B=5, C=10, D=15, and E=20 t ha-1. Data on soil physical properties and plants were statistically analysed using ANOVA. The results showed that the change has an insignificant impact on soil physical properties, yet decreases BD (Bulk Density) by 28.2%; increases SOM (Soil Organic Matter) by 18.55%; TPS (Total Pore Space) by 13.7%, moisture content by 5.6%, permeability by 34.2%, and Available Water Pores (AWT) by 20%—application of 20 Mg ha-1. Tetadi increased the number of productive saplings by 52.65% and yield by 69.46% compared to the treatment without Tetadi application.
MODEL OF THE RELATIONSHIP BETWEEN SELECTED THE SOIL PHYSICAL PROPERTIES OF OIL PALM SOIL Hermawan, Bandi; Putri, Elsa Lolita; Utami, Wanda Afrilia; Prawito, Priyono
JOURNAL OF TROPICAL SOILS Vol. 31 No. 1: January 2026 (In Progress)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i1.%p

Abstract

Soil, water, and plants are interrelated elements in agricultural production. An in-depth understanding of the characteristics and interactions of these three aspects is essential in effective agricultural system management. The study aims to examine the relationship of soil capacity to hold water to different levels of land slope and identify the physical characteristics of the soil that affect it. The research was conducted in a community oil palm plantation in Talang Tengah I Village, Pondok Kubang District, Central Bengkulu Regency, Bengkulu Province. The method used was a survey with purposive sampling at five different slope levels, namely flat (0-8%), sloping (8-15%), slightly steep (15-25%), steep (25-45%), and very steep (45-100%). The data was statistically analyzed using the Partial Least Squares Structural Equation Modelling (PLS-SEM) method with WarpPLS 7.0 software. The results showed that slope had a significant effect on various soil physical characteristics and soil water holding capacity. The steeper the slope, there is a decrease in soil permeability, total pore space, and C-Organic soil, and an increase in soil volume weight, which results in a decrease in soil water holding capacity. The resulting model shows the agreement in describing the relationship between variables, where slope affects organic matter, sand %, and permeability, and then volume weight affects total pore space and permeability, which in turn effects the soil’s capacity to hold water.