Acta Solum

Peranan Eco-Enzyme terhadap Perubahan Hara N Tanah dan Pertumbuhan Awal Padi pada Tanah Sawah Tadah Hujan

Sakti Agrianto Suwandi — 2024-11-26

Acid mineral soils in Indonesia mostly develop in wet tropical climates supported by high temperatures, so the weathering process runs faster than in dry climate areas. High rainfall causes intensive leaching, so basic cations are lost from the soil layer, and the soil has low base saturation. Some acid mineral soils in Indonesia are farmed under rainfed systems. This soil has a low nutrient availability status compared to irrigated rice fields, due to the lack of water availability, and is still dependent on rainfall. Eco-Enzyme (EE) contains several nutrients and microbes from fermentation that can increase soil fertility. This research aims to determine the effect of EE N nutrient availability and early rice growth in rainfed paddy fields. This study uses a Completely Randomized Design single factor, namely the total bacterial population in EE consisting of 5 treatments, namely K0= control; K1= 8,1 x 10⁶ cells mL^-1 in EE; K2= 1,2 x 10⁷ cells mL^-1 in EE; K3= 1,6 x 10⁷ cells mL^-1 in EE; and K4= 2 x 10⁷ cells mL^-1 in EE. Each treatment was repeated 4 times so that there were 20 experimental units. The results of the study show that the provision of the total bacterial population in EE 1,2 x 10⁷ cells mL^-1 can increase the pH to 5,38, N-NH₄⁺ to 154,60 mg kg^-1, and N-NO₃^- to 8,26 mg kg^-1. Giving total bacteria in EE 1,6 x 10⁷ cells mL^-1 can increase the viability of non-symbiotic N₂ fixing microbes.

Endopedon yang Berkembang dari Batuan Ultrabasa di Desa Bentok Darat Kabupaten Tanah Laut, Kalimantan Selatan

Ahmad Fahrezal — 2024-11-27

Although ultramafic rocks are widespread in Indonesia and have the potential to influence soil properties, studies on the genesis and properties of soils formed from these rocks, especially to understand the characteristics of the lower defining horizon or endopedon, are still limited. This study aims to identify the endopedons formed, which developed from the ultrabasic rocks. This research is descriptive, soil profile points are determined by purposive sampling method by considering that points are true ultrabasic rock distribution. Observations made in this study include observations in the field and observations in the laboratory. The data from the description and laboratory analysis were used as reference for identifying endopedon. Endopedon determination refers to the Keys to Soil Taxonomy 2014 , the twelfth edition. The oxic horizon in Profile-1 is found at a depth of 7 cm to 37 cm from the soil surface with the horizon codes B_o. The Oxic horizon in Profile-2 is located at a depth of 20 cm to 106 cm from the soil surface with the horizon codes B_o1, B_o2. Latosolization is the process that causes the formation of the oxic horizon. The study site is also an area with a wet tropical climate that supports the formation of the oxic horizon.

Analisis Perbandingan Agregat Mantap Air pada Lereng Curam Tanpa Teknik Konservasi Mekanik

Norhana Norhana — 2024-11-27

The slope is one of the important elements in topography that affects various natural processes and human activities. Slope position can lead to reduced soil fertility due to runoff. This research aims to analyze the comparison of water-stable aggregate on different slope positions which are divided into three, namely between upper slope, middle slope and lower slope. The research method used is descriptive comparative, which is carried out by deliberate sampling on sloping land planted with rubber plants with a depth of 0-20 cm and the same slope of 25-45% and then analyzed in the soil laboratory. Data were analyzed by t-test to determine the comparison of water-stable aggregate different slope positions. The results showed that water-stable aggregate values at different slope positions had significant differences. Water-stable aggregate values in the upper slope tend to be smaller than those in the middle slope and lower slope which are much larger. Slope position, organic-C content, and clay fraction affect water-stable aggregate values

Pengaruh Abu Terbang Batubara dan Tandan Kosong Kelapa Sawit terhadap pH, Eh serta Fe-Larut pada Lahan Sulfat Masam

Adam Febrius Udatama — 2024-11-27

The issue of acid sulfate soil in Indonesia, characterized by high acidity due to pyrite (FeS₂) oxidation, produces sulfuric acid and iron oxide detrimental to agricultural productivity. The use of ameliorants such as coal fly ash (ATB) and empty oil palm bunches (TKKS) is expected to improve soil chemical conditions. The study aims to assess the impact of the ATB and TKKS combination on increasing pH, lowering Eh, and reducing soluble Fe concentration in acid sulfate soils, determining the most effective dose. The research method employs completely randomized design (CRD) with various doses of a combination of ATB and TKKS applied to acidic sulfate soil. Observations focus on changes in pH, redox potential (Eh), and soluble Fe concentration post-treatment. Results of study indicated that application of the ATB and TKKS combination given significant effect to increase soil pH and decreased Eh values. Certain dose combinations exhibit higher effectiveness than single treatments. In conclusion, the combined use of ATB and TKKS offers an efficient and environmentally friendly solution to acidity and iron solubility issues in acidic sulfate soils, supporting increased agricultural land productivity.