ABSTRACT Chili pepper (Capsicum annum L.) is an important horticultural commodity with high economic value in Indonesia. National chili paper productivity in 2023 reached 7.05 t/ha, increased 4% from the previous year, but still needs improvement to meet increasing consumer demand. This study aimed to determine character inheritance and expected genetic advance from crossing Bhaskara and Genie…
ABSTRACT Maize (Zea mays L.) is one of strategic food commodities in Indonesia. Production improvement can be achieved through development of new varieties using mass selection in open-pollinated populations. This study aimed to determine differences between expected and actual selection response after selection with 10% and 15% intensities in 4 half-sib families of maize. The research was con…
ABSTRACT This study aimed to determine the effective concentration of Chinese betel leaf extract Peperomia pellucida L. to mortality of Myzus persicae Sulzer on red chili plant. The experiment was conducted in a greenhouse at the Faculty of Agriculture, University of Riau, from January to June 2025 using a Completely Randomized Design (CRD) with five treatments (0, 25, 50, 75, and 100 g/l of w…
ABSTRACT Red onion (Allium cepa L.) is an important horticultural commodity with high economic value in Indonesia. One of the obstacles in red onion cultivation is pest infestation, namely the onion armyworm (Spodoptera exigua Hubner). The use of the earwig predator (Euborellia annulata Fabricus) can be an alternative for natural control of S. exigua. This study aimed to determine the pred…
ABSTRACT This study aims to determine the actual selection response on various yield component traits with a selection intensity of 10% in a half-sib family corn population. This study was conducted experimentally using a randomized block design with 4 families and 4 replicates. The traits observed were male flower opening age, female flower opening age, harvest age, cob length without husk, c…
ABSTRACT Tomato (Solanum lycopersicum L.) is an important commodity in Indonesia, yet its productivity in Riau Province remains low due to cultivation challenges in lowlands with high temperatures. Plant breeding programs aimed at developing superior adaptive lowland varieties represent a potential solution. Breeding success depends on genetic diversity, heritability, and selection response of…
ABSTRACT This study aims to determine the most effective concentration of the local entomopathogenic nematode (EPN) Steinernema carpocapsae Weiser against Crocidolomia pavonana Fabricius a pest of pakcoy mustard under laboratory conditions. The study was conducted experimentally using a Completely Randomized Design (CRD) consisting of five treatments and four replications, resulting in a total…
ABSTRACT Soybean (Glycine max L. Merrill) is an important food commodity in Indonesia due to its high protein content. However, soybean production in Riau remains unstable due to suboptimal cultivation practices. Conventional intensive tillage and excessive inorganic fertilization have not significantly increased yields. No-till farming offers a potential solution to improve production, but co…
ABSTRACT This study aims to test the inhibitory ability of Trichoderma spp. and Bacillus spp. and to obtain Trichoderma spp. and Bacillus spp. species that are more capable of inhibiting F. oxysporum, as well as to determine the effect of applying SORT biocompost enriched with Trichoderma spp. Bacillus spp., and maggots, and to obtain the best type of biocompost for improving pakcoy growth and…
ABSTRACT Oil palm is an important commodity contributing significantly to Indonesia's non-oil and gas sector revenue. The increasing need for replanting aging plantations requires high-quality seedlings. Ultisol soil, widely distributed in Indonesia, has low productivity due to clay accumulation in the subsurface horizon, low organic matter content, and poor nutrient retention. This limitation…
ABSTRACT Okra is a plant that provides many health benefits. The low productivity of okra in Riau is partly caused by poor soil fertility. This study aims to determine the interaction between the application of chicken manure and NPK fertilizer on the growth and yield of okra plants, as well as to identify the optimum dosage of both fertilizers. The experiment was conducted using a factorial ra…
ABSTRACT This study was conducted at Buluh Cina Nature Park (TWA Buluh Cina) to determine visitors’ willingness to pay (WTP) for environmental conservation and to identify the socio-demographic factors influencing it. The research employed the Contingent Valuation Method (CVM) with an open-ended approach to estimate the WTP value, and multiple linear regression was used to examine the f…
ABSTRACT Debarking Debarking is a critical stage in timber harvesting and processing because it directly affects raw material quality and the efficiency of subsequent operations. At PT Riau Andalan Pulp and Paper (RAPP), Pelalawan Estate, the implementation of Land-Based Debarking Pontons (DPD) has been developed to improve the productivity and efficiency of debarking activities. This stud…
ABSTRACT The mangrove ecosystem in Teluk Pambang Village faces increasing threats from ecological degradation and weak institutional capacity. This study evaluates the sustainability of mangrove management across ecological, economic, social, and institutional dimensions using a mixed-methods approach that combines RAPMECS analysis with interviews, field observations, and document reviews…
ABSTRACT This study aims to analyze the productivity of wood harvesting at PT. Perawang Sukses Perkasa Industri (PSPI) Lipat Kain District and the implementation of the Reduce Impact Logging (RIL) technique. The RIL technique is expected to improve harvesting efficiency and minimize negative environmental impacts. The study used a descriptive quantitative method with data collection throu…
ABSTRACT Mangrove forests are ecosystems located in coastal areas that play an important role in maintaining environmental balance, such as protecting coastlines from erosion, providing habitats for various species, and absorbing carbon. This study aims to identify the biophysical characteristics of the mangrove ecosystem in Teluk Pambang Village, Bantan District, Bengkalis Regency. The re…
ABSTRACT Illegal gold mining has become a critical environmental issue in Sembilan Koto District, Dharmasraya Regency, West Sumatra. This study aims to analyze the environmental, social, and economic impacts caused by illegal mining activities in the area. A qualitative research approach was used, supported by spatial analysis using ArcGIS, field observations, water quality laboratory anal…
ABSTRACT Forest and land fires are a serious environmental problem that occurs every year in Pelalawan Regency and causes ecological, economic, social, and political losses. In the 2022–2024 period, the area affected by forest and land fires reached 3.315,13 ha with an increasing trend, mainly because most of Pelalawan is peatland that is easily burn during the dry season. This study was…
In Indonesia, the incidence of bone fractures in 2018 reached approximately nine million cases, with various types and causes. Hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂ or HAp) is one of the bioceramics commonly used in biomedical applications due to its biocompatible and osteoconductive properties, allowing it to integrate well with bone. This study aims to determine the time required for…
Palm Kernel Expeller (PKE), a by-product of palm oil milling, is a lignocellulosic biomass with high potential as a renewable energy source. However, the direct pyrolysis of PKE often yields bio-oil with poor fuel properties due to its high oxygen content, necessitating catalytic upgrading strategies. This study aims to optimize the yield and energy quality of bio-oil derived from the catalyti…