M.Eng. Ir. Rachmad Jayadi
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View article: Analysis of Structural Break Using Dummy Variable Regression on Industrial Stock Returns in Indonesia Stock Exchange
Analysis of Structural Break Using Dummy Variable Regression on Industrial Stock Returns in Indonesia Stock Exchange Open
This research examines the problem of structural breaks in sectoral stock returns as a result of the global economic crisis in 2022. The focus of this research is an investigation into the impact of fluctuations in global economic factors,…
View article: Hedgerow Shading Reduces Heat Stress and Improves Cacao Physiology and Soil Fertility in Tropical Systems
Hedgerow Shading Reduces Heat Stress and Improves Cacao Physiology and Soil Fertility in Tropical Systems Open
Aims Elevated temperatures during the vegetative phase pose a significant threat to the physiological stability and growth of cacao (Theobroma cacao L.), particularly on limited land in tropical areas. This study examined the efficacy of v…
View article: Toward Greener Harvests: Unveiling the Synergistic Effects of Biochar and Biosaka on Sweet Corn (Zea mays saccharata) Growth, Yield, and Physiology
Toward Greener Harvests: Unveiling the Synergistic Effects of Biochar and Biosaka on Sweet Corn (Zea mays saccharata) Growth, Yield, and Physiology Open
Numerous studies highlight the benefits of rice husk biochar in improving the physical and chemical properties of soil. However, the synergistic effects of biochar combined with biosaka as a plant defense elicitor remain understudied. This…
View article: A comprehensive multivariate approach for GxE interaction analysis in early maturing rice varieties
A comprehensive multivariate approach for GxE interaction analysis in early maturing rice varieties Open
The genotype evaluation process requires analysis of GxE interactions to ascertain the responsiveness of a genotype to various environments, including the development of early maturing rice. However, the concept of interaction is relativel…
View article: Influence of variety, beneficial fungi, and application on the growth and production of shallot (Allium ascalonicum L.)
Influence of variety, beneficial fungi, and application on the growth and production of shallot (Allium ascalonicum L.) Open
One effort to increase shallot production is the use of beneficial fungi. This research aims to determine the interaction between variety, type of fungus, and application dose on the growth and yield of shallot plants. The experimental des…
View article: Mycorrhiza Arbuscular's Morpho-Species Identification in The Post- Nickel Mining Soil
Mycorrhiza Arbuscular's Morpho-Species Identification in The Post- Nickel Mining Soil Open
Using biological agent microorganisms such as Arbuscular Vesicular Mycorrhiza (AVM) is needed to improve post-mining soil fertility. This research aimed to explore and identify morpho species of AVM in the post-nickel mining areas Soil sam…
View article: Effect of Inundation Depth, Dosage of Sago Bagasse and Husk Charcoal on Sago Palm Seedling (Metroxylon sagu) Grown in Polybags
Effect of Inundation Depth, Dosage of Sago Bagasse and Husk Charcoal on Sago Palm Seedling (Metroxylon sagu) Grown in Polybags Open
Various attempts have been made to increase the survival rate (SR) of sago plants (Metroxylon sagu Rottb), especially the treatment of growing media and irrigation.The purpose of this study was to calculate the effect of (i) the depth of i…
View article: Studi Integrasi Seed Coating Fe dan Inkubasi Pupuk Organik Limbah Sagu dalam Pengoptimalan Pertumbuhan Padi
Studi Integrasi Seed Coating Fe dan Inkubasi Pupuk Organik Limbah Sagu dalam Pengoptimalan Pertumbuhan Padi Open
Rice (Oryza sativa) production in Indonesia has declined due to low iron (Fe) availability in alkaline soils, impacting plant growth and yield. Integrating Fe seed coating with sago (Metroxylon sp.) waste organic fertilizer may improve Fe …
View article: A new concept in assessing adaptability index for superior potential cropping intensity in early-maturing rice
A new concept in assessing adaptability index for superior potential cropping intensity in early-maturing rice Open
Implementing a cropping intensity program with rice cultivation four times a year (CI 400) can be achieved using early maturing varieties of rice. However, this development needs to pay attention to the adaptability of the varieties plante…
View article: PENGARUH SIMULASI TERHADAP PENINGKATAN PENGETAHUAN DAN KETERAMPILAN APARATUR DINAS PEMADAM KEBAKARAN DAN PENYELAMATAN KABUPATEN SUMBAWA BARAT
PENGARUH SIMULASI TERHADAP PENINGKATAN PENGETAHUAN DAN KETERAMPILAN APARATUR DINAS PEMADAM KEBAKARAN DAN PENYELAMATAN KABUPATEN SUMBAWA BARAT Open
The number of fire incidents in West Sumbawa Regency has increased significantly. In response to this problem, the study attempted to examine the issue of evaluating the effect of simulation training on improving the knowledge and skills o…
View article: Isolation of potential Zn solubilizing bacteria from corn rhizosphere
Isolation of potential Zn solubilizing bacteria from corn rhizosphere Open
Deficiency of micronutrients is a limiting factor in crop productivity. In terms of micronutrient deficiencies, zinc (Zn) deficiency is considered the most common. Obstacles to the availability of Zn in plants are not caused by the low tot…
View article: Methane gas emissions (CH<sub>4</sub>) in paddy fields in Minasatene District, Pangkep Regency: Microbial abundance against increased methane gas
Methane gas emissions (CH<sub>4</sub>) in paddy fields in Minasatene District, Pangkep Regency: Microbial abundance against increased methane gas Open
Global warming caused by various human activities results in increased concentrations of Greenhouse Gas (GHG) emissions. This causes the problem of climate change. One of the sources of Indonesia’s greenhouse gas (GHG) emissions comes from…
View article: Response of vegetative phase growth of very early maturing rice plant to the application of liquid biosilica in paddy field
Response of vegetative phase growth of very early maturing rice plant to the application of liquid biosilica in paddy field Open
An increase in the cropping index causes the land to be cultivated more intensively and has impact on decreasing Silica content (Si) so that it is necessary to add Si to support the growth of rice plants, especially on intensive land. This…
View article: Bacterial abundance of cacao agroforestry, cacao monoculture and secondary forest land uses in north Luwu, South Sulawesi
Bacterial abundance of cacao agroforestry, cacao monoculture and secondary forest land uses in north Luwu, South Sulawesi Open
Expanding the agricultural sector in North Luwu influences land use modification to enhance plantation output. Continuous land use and clearance can jeopardize the survival of native land vegetation, altering C and N cycles, community comp…
View article: Growth and production of japanese taro (Colocasia esculenta var. antiquorum) by using plastic mulch and biofertilizer
Growth and production of japanese taro (Colocasia esculenta var. antiquorum) by using plastic mulch and biofertilizer Open
Japanese taro (Colocasia esculenta var. antiquorum) production in Indonesia is around 20 tons/hectare, but it is still relatively low due to the low level of farmer management including fertilizing and watering especially in dry season. We…
View article: Efektivitas Pupuk Organik Cair Bawang Merah dan Limbah Bawang Merah Terhadap Perubahan Sifat Kimia Tanah dan Pertumbuhan Bawang Merah
Efektivitas Pupuk Organik Cair Bawang Merah dan Limbah Bawang Merah Terhadap Perubahan Sifat Kimia Tanah dan Pertumbuhan Bawang Merah Open
Soil has an important role "in agriculture for the growth and production" of plants. The combination of organic and inorganic fertilizers can increase crop productivity and improve soil quality on land so that it can be used sustainably. O…
View article: Keanekaragaman Biota Tanah pada Kebun Kakao di Desa Parenring Kecamatan Lilirilau Kabupaten Soppeng
Keanekaragaman Biota Tanah pada Kebun Kakao di Desa Parenring Kecamatan Lilirilau Kabupaten Soppeng Open
This study aims to determine the diversity of soil fauna based on the landscape and soil depth in the cocoa plantation in Parenring Village, Lilirilau District, Soppeng Regency. This research was conducted from October 2020 to January 2021…
View article: Availability of phosphorus in Ultisols by applying compost and phosphate rock
Availability of phosphorus in Ultisols by applying compost and phosphate rock Open
Ultisols are the largest order in Indonesia among other acid soils, namely around 41,919 million ha, with the problem of insufficient P availability in soil for plant growth, requiring special treatment to increase available P in the soil.…
View article: Screening of acid-tolerant hybrid Corn lines and parents using modified acid mineral soil
Screening of acid-tolerant hybrid Corn lines and parents using modified acid mineral soil Open
Screening of hybrid corn parent lines quickly and cheaply compared to hydroponic methods in the laboratory is needed to support the assembly of new high yielding varieties of acid tolerant corn. Addition of CaCO 3 as equivalent to 2 t/ha (…
View article: Soil Micromorphology for Modeling Spatial on Landslide Susceptibility MappingA Case Study in Kelara Subwatershed, Jeneponto Regency of South Sulawesi, Indonesia
Soil Micromorphology for Modeling Spatial on Landslide Susceptibility MappingA Case Study in Kelara Subwatershed, Jeneponto Regency of South Sulawesi, Indonesia Open
Most of the results of classifying the level of susceptibility show different results, where landslides are more common in areas with a relatively high to moderate susceptibility class compared to those with a high susceptibility class. Di…
View article: Methane emission and rice growth on clayey soil under controlled water regime
Methane emission and rice growth on clayey soil under controlled water regime Open
Conventional lowland rice cultivation involves flooding the paddy from planting to close to harvest, and high N fertilization. This practice leads to large amount of methane emissions. We studied the effect of soil water regime control on …
View article: Improvement of post-nickel mining soil fertility with biochar and calcite
Improvement of post-nickel mining soil fertility with biochar and calcite Open
Reclamation of post-nickel mining soil requires a long process and renewable innovations to improve soil properties. One of the alternative technologies for post-mining soil reclamation is utilizing oil palm empty fruit bunches (OEFB) as b…
View article: Soil Function Analysis in Determining the Soil Quality Index of Paddy Fields in Salassae Village, Bulukumba Regency, South Sulawesi Province, Indonesia
Soil Function Analysis in Determining the Soil Quality Index of Paddy Fields in Salassae Village, Bulukumba Regency, South Sulawesi Province, Indonesia Open
Background: The quality of the function of paddy fields in Indonesia is strongly influenced by the high intensity of the level of management. Degradation of soil quality with improper management practice result in the loss of land resource…
View article: Using of Oil Palm Empty Fruit Bunch Compost and Mycorrhizae Arbuscular for Improving the Fertility of Nickel Post-Mining Soil
Using of Oil Palm Empty Fruit Bunch Compost and Mycorrhizae Arbuscular for Improving the Fertility of Nickel Post-Mining Soil Open
The nickel post-mining soil with an open-pit mining system has poor soil chemical and physical properties. Thus, it requires appropriate site-specific management so that it can be optimized as a plant cultivation area. This study aimed to …
View article: The productivity and economic value of sweet potato (Ipomea batatas) planted intercropped with satoimo taro (Colocasia esculenta (L.) Schott var. Antiquorum) with various levels of compost
The productivity and economic value of sweet potato (Ipomea batatas) planted intercropped with satoimo taro (Colocasia esculenta (L.) Schott var. Antiquorum) with various levels of compost Open
Sweetpotato ( Ipomea batatas ), as a well-known plant and widely cultivated by farmers in South Sulawesi, if it is intercropped with satoimo taro ( Colocasia esculenta (L.) Schott var. Antiquorum) as a staple crop should be suspected of be…
View article: Minerals of parent material as an indicator of soil fertility
Minerals of parent material as an indicator of soil fertility Open
Soil fertility is the ability of the soil to provide nutrients. Most of the nutrients in the soil come from mineral weathering. The higher of an easily weathered mineral is in line with soil fertility. This research aims to study soil fert…
View article: Isolation, characterization and identification of nitrogen fixing bacteria with organic fertilizer applications in paddy soil
Isolation, characterization and identification of nitrogen fixing bacteria with organic fertilizer applications in paddy soil Open
The high organic matter content allows soil microbial activity to recycle organic matter, which is essential for life, such as the nitrogen cycle. The process of biological nitrogen fixation by microorganisms is crucial for nitrogen entry …
View article: Application of humic substances and bottom ash compounds in improving soil quality in limestone post-mining land
Application of humic substances and bottom ash compounds in improving soil quality in limestone post-mining land Open
Limestone mining leaves the ex-mine land with poor soil chemical quality. Humic substances can be used as fertilizer to increase macronutrient availability in the soil and improve pH. The application of coal ash can improve the soil’s chem…
View article: The potential for developing sago-taro intercropping in South Sulawesi: a review
The potential for developing sago-taro intercropping in South Sulawesi: a review Open
FAO predicts that by 2050, food production will need to increase by up to 60 percent, while at the same time there will be a scarcity of agricultural resources, especially land / land and water. Therefore, modernization of agriculture, exp…