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Jurnal Tanah Tropika
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This is an Open Access Journal

Open Access journal
ISSN (Print) 0852-257X - ISSN (Online) 2086-6682
Published by Lampung University

[2 journals]

Effect of Coffee Ages and Shade Types on Soil Moisture and Soil N, P, K
Availability in UB Forest
- Authors: zenny faridatus sa'diyah, Sugeng Prijono, Retno Suntari, Zaenal Kusuma
  Pages: 39 - 45
  Abstract: Water and nutrients is important for plant which has its characteristics. This study has been carried out in the UB (Brawijaya University) forest about soil moisture content during rainy and dry seasons, Total-N, -P, -K from litter on different types of shade and age of coffee plants, and their effect on soil Available-N, -P, and -K. There are P1 (control), P2 (4-year-coffee + pine), P3 (7-year-coffee + pine), P4 (4-year-coffee + mahogany), and P5 (7-year-coffee + mahogany). These treatments affected to total soil moisture storage, Total-N, -P, -K of litter, and Available-N, -P, -K in the soil. The soil moisture storage change between rainy and dry seasons was 36.97 mm. The highest Total-N, -P, and -K of litter was 11.00 kg ha-1 y-1 at P3, 1.06 kg ha-1 y-1 at P2, and 4.35 kg ha-1 y-1 at P3, which was inconsistently associated with high soil nutrients. The highest Total-N was 0.40 (0-20 cm), 0.27 (20-40 cm), 0.30% (40-60 cm) at P4, Available-K was 1.69 (0-20 cm), 1.64 (20-40 cm), 1.87 cmol kg-1 (40-60 cm) at P5, and Available-P was 15.21 (0-20 cm), 14.06 (20-40 cm), 12.64 mg kg-1 (40-60 cm) at P1.
  PubDate: 2023-02-20
  DOI: 10.5400/jts.2023.v28i2.39-45
  Issue No: Vol. 28, No. 2 (2023)
Changes of Soil Chemistry Characteristics of Tephra Mount Anak
Krakatau-Indonesia, Through Leaching Experiment
- Authors: Astriana Rahmi Setiawati, Jamalam Lumbanraja, Ananda Ika Kurnia, Manarul Hidayat, Septi Nurul Aini, Dedy Prasetyo
  Pages: 57 - 70
  Abstract: Studying the weathering process in pristine volcanic materials is crucial as this process will determine further soil characteristics. Mount Anak Krakatau is reported as one of the fastest-growing volcanoes. This volcano erupted powerfully in December 2018, ejecting tons of volcanic materials. These materials are considered pristine and unweathered tephra. Hence, a leaching experiment can be one of the crucial methods to predict further soil characteristics formed as climatic factors. Tephra sampling was conducted on 13 Augustus 2019 or eight months after the massive eruption of Mount Anak Krakatau in December 2018. Tephra samples were leached by deionized water (H2O), oxalic acid (H2C2O4) 0.02 M, and citric acid (C6H8O7) 0.02 M (solvents) for 90 days. pH of tephra increased approximately from (3.95– 4.99 ) to (5.12–8.11). Organic-C rose about 0.2 to 1 point higher than organic-C of tephra before the leaching experiment. The increasing value of organic-C was predicted to increase CEC (Cation Exchange Capacity) (2.13–5.36 cmolc kg-1). After the leaching experiment, the tephra’s surface was weathered clearly as an impact of solvents and the growing of algae.
  PubDate: 2023-06-07
  DOI: 10.5400/jts.2023.v28i2.57-70
  Issue No: Vol. 28, No. 2 (2023)
Performance The Red Onion (Allium ascalonicum L.) by Husk Charcoal and
Fertilizer K Application
- Authors: Rakhmiati Rakhmiati, Etik Puji Handayani, Jamaludin Jamaludin, Raffel Jubili Sitompul
  Pages: 71 - 77
  Abstract: The cultivation of Red Onions (Allium ascalonicum, L.) in paddy fields needs to be investigated further because paddy fields have constraints on the soil physical and chemical properties, such as soil structure, drainage, pH, and nutrient availability. The application of husk charcoal and K fertilizer is expected to increase the productivity of Red Onions, so it is necessary to study the appropriate dose. The research aimed to determine the effect of the interaction between the application of husk charcoal and KCl fertilizer and the influence of each factor on the growth and yield of Red Onions. The results showed that rice husk charcoal treatment at a dose of 20 Mg ha-1 was effective in increasing the growth and yield of Red Onions compared to rice husk charcoal at a dose of 10 Mg ha-1 and 0 Mg ha-1 (control), as evidenced by the variable shallot plant height, number of leaves, number of tubers per clump, wet tuber weight per clump, and tuber dry weight per clump. KCl fertilizer treatments at doses of 100 kg ha-1, 200 kg ha-1, and 300 kg ha-1 did not significantly affect to growth and yield of Red Onions. There was not interaction between the rice husk charcoal and KCl fertilizer treatments.
  PubDate: 2023-01-31
  DOI: 10.5400/jts.2023.v28i2.71-77
  Issue No: Vol. 28, No. 2 (2023)
Changes of Soil Physical and Chemical Characteristics of Vertisol by
Organic Matter and Sands Applications
- Authors: Wanti - Mindari, Purnomo Edi Sasongko, Setyo Budi Santoso
  Pages: 79 - 87
  Abstract: Vertisol has a clay texture, high micropores, and high water and nutrient absorption ability. The high water content of Vertisol causes the air to decrease, thus inhibiting root development. Stretching of the Vertisol structure is expected to increase soil porosity and reduce ion and water absorption. This study examines interactions between organic matter and percent sand on soil porosity and nutrient availability. The study was arranged according to a factorial Completely Randomized Design (CRD), repeated three times. The first factor was seven kinds of organic matter (control, cow dung + banana peel compost, cow dung + leaf litter compost + compost water hyacinth + cow dung, humin, humic acid, and biochar. The application doses are respectively for each treatment: humic acid and humin 20 kg ha-1, biochar 1 Mg ha-1, compost+manure fertilizer 15 Mg ha-1. Changes in soil chemical characteristics were evaluated against pH, C-org, and Available-P, while changes in soil physical characteristics were evaluated against bulk density, particle density, and soil porosity. The results showed that the combination of organic matter and percent sand could improve the physical and chemical characteristics of the soil. Bulk density (BD), particle density (PD), and soil porosity increased with the addition of sand. The organic matter significantly correlated with improving soil properties was humic acid, humin, biochar, compost, and manure, with the best percentage of sand at 20%.
  PubDate: 2023-02-20
  DOI: 10.5400/jts.2023.v28i2.79-87
  Issue No: Vol. 28, No. 2 (2023)
Using Geostatistics for Spatial Analysis of Soil Moisture Content,
Electrical Conductivity, and pH at Paddy Fields
- Authors: Yagus Wijayanto, Muhammad Aldian Dwi Kustianto, Subhan Arif Budiman, Ika Purnamasari
  Pages: 47 - 56
  Abstract: Soil is dynamic due to various internal and external processes exerted on the soil, resulting in unique soil characteristics in space in short and long distances. Geostatistics (kriging) is the method of quantifying the spatial variation of soil properties. This research was mainly aimed at applying geostatistics to quantify and interpolate the spatial dependence and structure of three soil properties, namely pH, EC, and Soil Moisture Content (SMC) in a small area. This research was conducted on paddy fields in Mlandingan Kulon Village, Situbondo Regency. Sampling was conducted on an area of 9.2 ha with 31 sample points. Normal data distribution was found for pH and EC, whereas this was not the case for SMC. The results of the analysis showed that most of the pH values were alkaline (>8), EC values were non-saline (<2 mm/cm), and SMC was in the low category (<20%). The results show that for three soil properties, weak dependencies were observed. The values of Root Mean Square Error (RMSE) confirmed that kriging with exponential was better compared to the spherical model, resulting in the RMSE of 0.546 (pH), 0.041 (EC), and 1.512 (SMC).
  PubDate: 2022-11-24
  DOI: 10.5400/jts.2023.v28i2.47-56
  Issue No: Vol. 28, No. 2 (2022)