Suroso Rahutomo
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View article: Co-Designing Sustainable and Resilient Rubber Cultivation Systems Through Participatory Research with Stakeholders in Indonesia
Co-Designing Sustainable and Resilient Rubber Cultivation Systems Through Participatory Research with Stakeholders in Indonesia Open
The rubber industry is facing major socio-economic and environmental constraints. Rubber-based agroforestry systems represent a more sustainable solution through the diversification of income and the provision of greater ecosystem services…
View article: An Overview of Indonesian Natural Rubber Industry Performance
An Overview of Indonesian Natural Rubber Industry Performance Open
A study of the natural rubber commodity outlook has been done as a starting point for formulating a program to ensure the continued existence of Indonesia’s rubber industry. This study employed the desk study approach to analyze secondary …
View article: Reducing potassium leaching in peat soil using potassium zeolite-based fertilizer (ZEKA)
Reducing potassium leaching in peat soil using potassium zeolite-based fertilizer (ZEKA) Open
Using peat soils for agricultural purposes is challenged by low fertilizer efficiency, especially potassium chloride (KCl). On the other hand, zeolite is a potential material to produce slow-release fertilizers to improve fertilizer effici…
View article: Dataset from an investigation of the effect of natural zeolite particle size reduction as a material for the manufacture of slow-release potassium fertilizer in oil palm seedlings growth with peat soil planting media
Dataset from an investigation of the effect of natural zeolite particle size reduction as a material for the manufacture of slow-release potassium fertilizer in oil palm seedlings growth with peat soil planting media Open
Particle size is one-factor influencing zeolite's ion exchange properties. This study used natural zeolite with a particle size of ±0.147 mm and ±500 nm as a carrier for K-zeolite-based fertilizer. K in the zeolite-based fertilizer was exp…
View article: A Cutting-Edge Precision Agriculture Technology to Support the Sustainable Oil Palm Industry
A Cutting-Edge Precision Agriculture Technology to Support the Sustainable Oil Palm Industry Open
One of the most important factors in attaining sustainability in oil palm plantations is proper production input management in accordance with Good Agronomic Practices. For controlling plant disease and fertilizing, it can be started with …
View article: Pre-processing techniques using a machine learning approach to improve model accuracy in estimating oil palm leaf chlorophyll from portable chlorophyll meter measurement
Pre-processing techniques using a machine learning approach to improve model accuracy in estimating oil palm leaf chlorophyll from portable chlorophyll meter measurement Open
Chlorophyll is essential for plants because it absorbs and adjusts solar energy as an energy source in photosynthesis. Thus, chlorophyll content can be used as an indicator of plant performance. However, laboratory analysis should usually …
View article: Potassium Use Efficiency of Natural Zeolite-Based Potassium Fertilizer in Oil Palm Seedlings (Elaeis guineensis Jacq.) Using Peat Soil Media
Potassium Use Efficiency of Natural Zeolite-Based Potassium Fertilizer in Oil Palm Seedlings (Elaeis guineensis Jacq.) Using Peat Soil Media Open
Potassium is the most needed macronutrient for oil palm. However, the efficiency of potassium fertilization on peatlands is low due to leaching. One of the exertions to improve this fertilization's efficiency is peat soil amelioration and …
View article: Too little, too imbalanced: Nutrient supply in smallholder oil palm fields in Indonesia
Too little, too imbalanced: Nutrient supply in smallholder oil palm fields in Indonesia Open
Smallholders account for ca. 40% of oil palm area in Indonesia but average yield remains low. Despite higher overall fertilizer use in Indonesia compared with other Southeast Asian countries, poor plant nutrition has been identified as a m…
View article: Agronomy explains large yield gaps in smallholder oil palm fields
Agronomy explains large yield gaps in smallholder oil palm fields Open
Palm oil production is a major source of income for millions of smallholders in Indonesia. However, actual yield remains low in relation to the attainable yield. While emphasis has been given to planting material as a factor explaining low…
View article: Riset Pasar Biodiesel B20 di Indonesia: Evaluasi terhadap Produk dan Kesadaran Konsumen
Riset Pasar Biodiesel B20 di Indonesia: Evaluasi terhadap Produk dan Kesadaran Konsumen Open
There are considerably limited evaluations had dealt with the demand side of the Indonesian B20 biodiesel market. Thus, market research on product performance, product importance, and consumer awareness was performed. This research utilize…
View article: Study of soil bacteria and fungi population in oil palm with big hole planting system
Study of soil bacteria and fungi population in oil palm with big hole planting system Open
The big hole planting system for oil palm is one of the efforts to control the infection of Ganoderma boninense. The big hole method can also improve physical and chemical soil properties that affect the soil microbes population and in tur…
View article: Distribution of macronutrients (N, P, K, Mg) from single-nutrient and compound fertilizers application in oil palm seedlings (Elaeis guineensis Jacq.)
Distribution of macronutrients (N, P, K, Mg) from single-nutrient and compound fertilizers application in oil palm seedlings (Elaeis guineensis Jacq.) Open
Nutrients availability and plant's ability to absorb nutrients are essential factors in supporting plant performance. There are two forms of fertilizer as a source of nutrients for oil palm, which are single-nutrient fertilizer (SNF) and b…
View article: Preliminary Study on the Bacterial Community Structure of <i>Ganoderma</i> Soil Under Oil Palm Plantation
Preliminary Study on the Bacterial Community Structure of <i>Ganoderma</i> Soil Under Oil Palm Plantation Open
Basal stem rot (BSR) disease is caused by Ganoderma boninense; it has become a major disease in oil palm plantations over the years and causes a significant yield drop in oil palm plantations, especially in Sumatera.Nowadays, the incidence…
View article: Riset Pasar Biodiesel B20 di Indonesia: Evaluasi terhadap Produk dan Kesadaran Konsumen
Riset Pasar Biodiesel B20 di Indonesia: Evaluasi terhadap Produk dan Kesadaran Konsumen Open
There are considerably limited evaluations had dealt with the demand side of the Indonesian B20 biodiesel market. Thus, market research on product performance, product importance, and consumer awareness was performed. This research utilize…
View article: PENGARUH PEMOTONGAN TANGKAI METODE “CANGKEM BUAYA” TERHADAP PENINGKATAN KUALITAS TANDAN BUAH SEGAR
PENGARUH PEMOTONGAN TANGKAI METODE “CANGKEM BUAYA” TERHADAP PENINGKATAN KUALITAS TANDAN BUAH SEGAR Open
The low percentage fruit set will impact on the percentage of fruit to bunch and weight of Bunch. Fruit set islow causing the formation of partenokarpi fruit/coat so that the harvest process is involved in loading, carryingand processing. …
View article: PENGARUH PEMOTONGAN TANGKAI METODE “CANGKEM BUAYA” TERHADAP PENINGKATAN KUALITAS TANDAN BUAH SEGAR
PENGARUH PEMOTONGAN TANGKAI METODE “CANGKEM BUAYA” TERHADAP PENINGKATAN KUALITAS TANDAN BUAH SEGAR Open
The low percentage fruit set will impact on the percentage of fruit to bunch and weight of Bunch. Fruit set is low causing the formation of partenokarpi fruit/coat so that the harvest process is involved in loading, carrying and processing…
View article: Varying redox potential affects P release from stream bank sediments
Varying redox potential affects P release from stream bank sediments Open
Sediments in streams that drain agricultural watersheds may be sinks that can adsorb P from the stream or sources that can release P to the stream. Sediment characteristics and environmental factors, including the oxidation-reduction (redo…
View article: Identification of Ganoderma boninense Infection Levels on Oil Palm Using Vegetation Index
Identification of Ganoderma boninense Infection Levels on Oil Palm Using Vegetation Index Open
Basal stem rot (BSR) is known as a deathly disease in oil palm. It can immediately cause a significant decrease in the population of oil palm per hectare. BSR is associated with infection of Ganoderma boninense. The identification of infec…
View article: Phosphorus transformations in stream bank sediments in Iowa, USA, at varying redox potentials
Phosphorus transformations in stream bank sediments in Iowa, USA, at varying redox potentials Open
Stream bank erosion is one of the main sources of suspended sediments in stream water, and it often carries phosphorus with it. With a controlled laboratory study, we investigated the changes in different forms of P in stream bank sediment…
View article: LEACHING LEVEL OF N, P, K, AND SEVERAL TYPES OF FERTILIZER
LEACHING LEVEL OF N, P, K, AND SEVERAL TYPES OF FERTILIZER Open
A study to compare amount of N, P, K, and Mg leached from fertilizers had been conducted. Leaching was measured using percolator tubes for six months. Subsoil of Inceptisol collected from an oil palm plantation in North Sumatra was used to…
View article: DROUGHT AND HAZE EFFECTS ON OIL PALM ECOPHYSIOLOGY AND PRODUCTIVITY IN SOUTH SUMATRA
DROUGHT AND HAZE EFFECTS ON OIL PALM ECOPHYSIOLOGY AND PRODUCTIVITY IN SOUTH SUMATRA Open
Prolonged dry season, land fire, and haze disturbance occurred during El Niño 2015 in Indonesia. A study had been conducted to identify impacts of prolonged dry season and haze disturbance on ecophysiology of oil palm in Dawas Estate, Sout…
View article: MODELING OF MONTHLY OIL PALM YIELD PATTERN BASED ON DEPTH OF RAINFALL AND RAINY DAYS
MODELING OF MONTHLY OIL PALM YIELD PATTERN BASED ON DEPTH OF RAINFALL AND RAINY DAYS Open
Oil palm requires evenly distributed rainfall throughout the year to achieve optimum yield. This study was aimed to estimate monthly oil palm yield based on depth of rainfall and rainy days data. Yield data were collected from 12 years old…
View article: IMPACTS OF WATER TABLE AND SOIL AMELIORANT ON SOIL MOISTURE, CO2 EMISSION, AND OIL PALM YIELD ON PEAT SOIL
IMPACTS OF WATER TABLE AND SOIL AMELIORANT ON SOIL MOISTURE, CO2 EMISSION, AND OIL PALM YIELD ON PEAT SOIL Open
A field study on peat soil to investigate impacts of soil water table depth and soil ameliorant (steel sludge) had been carried out on mature oil palm. Three treatments of soil water table management and four rates of steel sludge applicat…
View article: IMPACTS OF WATER TABLE AND SOIL AMELIORANT ON SOIL MOISTURE, CO2 EMISSION, AND OIL PALM YIELD ON PEAT SOIL
IMPACTS OF WATER TABLE AND SOIL AMELIORANT ON SOIL MOISTURE, CO2 EMISSION, AND OIL PALM YIELD ON PEAT SOIL Open
A field study on peat soil to investigate impacts of soil water table depth and soil ameliorant (steel sludge) had been carried out on mature oil palm. Three treatments of soil water table management and four rates of steel sludge applicat…
View article: MODELING OF MONTHLY OIL PALM YIELD PATTERN BASED ON DEPTH OF RAINFALL AND RAINY DAYS
MODELING OF MONTHLY OIL PALM YIELD PATTERN BASED ON DEPTH OF RAINFALL AND RAINY DAYS Open
Oil palm requires evenly distributed rainfall throughout the year to achieve optimum yield. This study was aimed to estimate monthly oil palm yield based on depth of rainfall and rainy days data. Yield data were collected from 12 years old…
View article: DROUGHT AND HAZE EFFECTS ON OIL PALM ECOPHYSIOLOGY AND PRODUCTIVITY IN SOUTH SUMATRA
DROUGHT AND HAZE EFFECTS ON OIL PALM ECOPHYSIOLOGY AND PRODUCTIVITY IN SOUTH SUMATRA Open
Prolonged dry season, land fire, and haze disturbance occurred during El Niño 2015 in Indonesia. A study had been conducted to identify impacts of prolonged dry season and haze disturbance on ecophysiology of oil palm in Dawas Estate, Sout…
View article: ROOT DISTRIBUTION OF OIL PALM AND SOIL PHYSICAL PROPERTIES IN DIFFERENT PLANTING HOLE AND EMPTY FRUIT BUNCHES APPLICATION
ROOT DISTRIBUTION OF OIL PALM AND SOIL PHYSICAL PROPERTIES IN DIFFERENT PLANTING HOLE AND EMPTY FRUIT BUNCHES APPLICATION Open
This study was conducted to determine the root distribution and to analyze soil physical factors that affect roots development in different size of planting hole; standard (0.6 m x 0.6 m x 0.6 m), medium ((1 x 1 cm x 0.6 m) with 400 kg emp…
View article: ROOT DISTRIBUTION OF OIL PALM AND SOIL PHYSICAL PROPERTIES IN DIFFERENT PLANTING HOLE AND EMPTY FRUIT BUNCHES APPLICATION
ROOT DISTRIBUTION OF OIL PALM AND SOIL PHYSICAL PROPERTIES IN DIFFERENT PLANTING HOLE AND EMPTY FRUIT BUNCHES APPLICATION Open
This study was conducted to determine the root distribution and to analyze soil physical factors that affect roots development in different size of planting hole; standard (0.6 m x 0.6 m x 0.6 m), medium ((1 x 1 cm x 0.6 m) with 400 kg emp…