AGROISTA : Jurnal Agroteknologi

Evaluasi Kesesuaian Lahan dan Interaksi Faktor Pembatas Tanaman Kopi Arabika (Coffea arabica L.) Berbasis Kriteria Sys Di Pagerharjo, Kulon Progo

Tue, 02 Jun 2026 00:00:00 +0700

Land suitability plays a critical role in determining the productivity and sustainability of Arabica coffee cultivation, particularly in areas with complex environmental conditions. This study aimed to evaluate land suitability and analyze the interaction of limiting factors for Arabica coffee cultivation in Pagerharjo, Kulon Progo. A field survey method was employed using land mapping units as the basis of analysis. Soil physical and chemical properties, topographic conditions, and climate data were collected through field observation, laboratory analysis, and secondary data sources. Land suitability was assessed using Sys criteria, which integrate climate, soil, and topographic characteristics through a semi-quantitative and interpretative approach. The results showed that land suitability was dominated by moderately suitable class (S2), with several units classified as highly suitable (S1), and a small portion as marginally suitable (S3). The main limiting factors included temperature (tc), oxygen availability (oa), rooting conditions (rc), and erosion hazard (eh), which interactively influenced land performance. Improvements such as organic matter addition, drainage enhancement, and soil conservation increased land suitability from actual to potential conditions. However, temperature remained a persistent limiting factor due to its role in regulating plant physiological processes and its dependence on macro-environmental conditions. This study demonstrates that land suitability is determined by complex interactions among soil, topography, and climate rather than single factors. The Sys-based approach provides a more comprehensive evaluation by capturing these interactions and identifying both manageable and permanent constraints. These findings highlight the importance of integrated land evaluation for site-specific management and sustainable development of Arabica coffee cultivation.

Potensi dan Distribusi Limbah Biomassa Pertanian sebagai Penghasil Bioenergi di Kabupaten Gunungkidul

Betti Yuniasih, Listiyani, Githa Noviana, Amir Noviyanto — Mon, 08 Jun 2026 00:00:00 +0700

Agricultural waste has the potential to serve as an environmentally friendly source of bioenergy. This study aims to determine the potential of agricultural waste as a bioenergy source, assess the amount of bioenergy that can be generated, and identify the distribution of this energy potential within Gunungkidul Regency. This study utilizes agricultural commodity production data from the Gunungkidul Regency Agriculture Office. Biomass waste estimates were calculated using the RPR (residue-to-product ratio). Estimates of the energy produced were calculated by multiplying the estimated agricultural waste by the lower heating value (LHV) for each commodity. Data on waste utilization was collected through in-depth interviews with key figures at the Gunungkidul Regency Agriculture Office. The estimated energy values for each subdistrict were mapped using ArcGIS Pro and visualized as a color gradient. The study results indicate that the total estimated agricultural waste in Gunungkidul amounts to 1,808,807 tons per year. The primary crops contributing the highest volume of agricultural waste are cassava, corn, rice, and bananas. This agricultural waste has the potential to be processed into bioenergy in the form of bioethanol, biobriquettes, biochar, biotanol, or biogas. The districts with high-potential bioenergy from agricultural waste are Saptosari, Semin, and Ponjong, which are dominated by dryland farming of cassava, upland rice, and corn. The majority of areas in Gunungkidul Regency have moderate bioenergy potential. Agricultural waste in Gunungkidul Regency has the potential to be processed into bioenergy to foster energy self-sufficiency in each area of the regency.

Pengaruh Konsentrasi NAA dan BAP terhadap Induksi Kalus Gambir (Uncaria gambir Roxb.)

Rita Elfianis, Rohmat Firdaus, Oksana, Nida Wafiqah Nabila M. ` Solin — Mon, 08 Jun 2026 00:00:00 +0700

Gambier is generally propagated both generatively and vegetatively. However, these methods require a long time and often result in non uniform quality. Tissue culture is an alternative technique that can improve gambier quality within a relatively shorter period through callus induction. This Study aimed to determine the best concentrations of NAA, BAP, and their combination for inducing callus. This research was conducted at the Reproduction and Breeding Laboratory of Sultan Syarif Kasim Riau State Islamic University. This study employed an experimental method using a factorial Randomized Block Design (RBD). The first factor was the concentration of NAA (0 mg/L, 0.25 mg/L, 0.5 mg/L, 0.75 mg/L, 1 mg/L), while the second factor was the concentration of BAP (0 mg/L, 0.75 mg/L, 1.5 mg/L, 2.25 mg/L). In total, 20 treatment combinations were arranged in five replications. The observed parameters includes time to callus initiation, percentage of callus formation, callus texture, and callus color. The results showed that NAA at 0.5 mg/L was the best concentration for gambier callus induction, while BAP at 1.5 mg/L was also optimal for the purpose. The combination of 0.5 mg/L NAA and 1.5 mg/L BAP was the best treatment, accelerating callus initiation to 15.1 days after planting (DAP), with 50% yellowish-white callus and 60% friable texture.