The production of arabica coffee in Indonesia is still low because of leaf rust disease suppression caused by Hemileia vastatrix. Basically, it can produce well in the overlapping zone (1000-1500 masl). This potential can be used as basic for intensifying arabica coffee cultivation to the lowland. For anticipation steps to reduce the spread of leaf rust can be done by increasing the production of polyphenol as plant resistance. The addition of mineral element such as silica, boron, iodine, calcium, and potassium can stimulate the synthesis of plant polyphenol. In this research, five minerals above were tested into 7 treatment with single factor RCBD, that is without additional of the mineral element, 150 mg L-1 Si, 300 mg L-1 B, 3000 mg L-1 Ca, 20.000 mg L-1 K, 300 mg L-1 I, and the combination/mix of five mineral elements. The laboratory analysis shows that calcium able to produce the highest polyphenol, but it is not a real difference with silica. The polyphenol that synthesized by Si, I, and K was able to reduce the leaf rust incidence until 78,13%, while Ca can reduce the incidence up to 71,88%.
Lowland arabica coffee can be affected by leaf rust and its decrease the coffee production up to 80%. The resistance level of the plant can be determined by the content of cellulose, lignin, calcium pectate, and polyphenols in leaf tissue. Many publications reported that the mineral element could increase the content of the metabolites. This study aimed to determine the effect of Si, B, I, Ca, and K on the incidence of leaf rust attack. The experiment was carried out at 400 m a.s.l. in 2018. The experimental subjects were KT variety, which was six years old. The experiment used a randomized block design with seven treatments. The results showed that there were 1) decrease the number of leaves affected by rust between first and second observation, and 2) compared to controls, all treatments has decreased the incidence of attacks leaf rust disease. Conclusion: There is a tendency of differences in the incidence rate of attack of leaf rust disease in each treatment. Control plants showed the highest incidence rate of 1.25%, while the lowest incidence was affected by Silica, iodine, and potassium, which were 0.63%. The treatment of silica and iodine was able to reduce the highest number of colonies Leaf Rust.
Indonesia's population in 2021 will increase by 0.92% from 2020. The increasing population demands the fulfillment of food. Land changes and their consequences indicate land damage. The purpose of the study was to assess the soil damage potential index (SDPI) on the slopes of Mount Argopura through terrain analysis and the use of geographic information system technology. The research was carried out on the slopes of Mount Argopura in 2022. The tools used included a clinometer, a GPS, spectrophotometer, AAS, arc GIS 13 and minitab. The materials included administrative maps, soil maps, slope maps, RBI maps, land use maps, rainfall maps. This research is descriptive exploratory with field survey method. The activity is divided into 3 stages, namely pre-survey, field survey, and post-survey. Research parameters include texture, soil thickness, soil type, soil pH, CEC, base saturation, soil drainage, parent material, landform, relief, rainfall, and land use. Based on the results of the study, the SDPI with an area of 22,148.75 ha was in the heavy category 44.12% (9772.28 ha), the medium category was 53.11% (11762.84 ha), and the light category was 2.77% (613.63 ha). Keywords: Geographic Information System, Land Degradation, Mount Argopura, Soil Damage
Desa Curahpoh, Kecamatan Curah Dami, Kabupaten Bondowoso memiliki potensi dalam menghasilkan kopi yang berkualitas serta dapat diarahkan menjadi Desa sentral kopi. Perekonomian masyarakat Desa Curahpoh tergantung pada hasil panen kebun kopi. Permasalahannya adalah kualitas kopi yang rendah dikarenakan jenis varietas kopi yang ditanam beragam (tidak jelas). Sejak 2019 sampai sekarang kami akan selalu membina petani kopi. Petani kopi yang kami bina merupakan petani kopi yang tergabung dalam LMDH Argo Santoso Desa Curahpoh, Kecamatan Curah Dami, Bondowoso. Tahun 2019 kami menghibahkan 300 bibit klonal BP 936, BP 939 dan BP 409. Tahun 2020 kami menyumbangkan 500 bibit klonal BP 358, BP42 dan BP 409. Bibit tersebut merupakan bibit hasil sambung stek dengan batang bawah BP 308 yang dikenal dengan perakaran yang lebat dan tahan kekeringan. Status tanaman kopi sekarang yaitu 300 tanaman menghasilkan (TM) dan 500 tanaman belum menghasilkan tahun 2 (TBM 2). Pengabdian kami dilakukan dengan meberikan sosialisasi dan pelatihan budidaya tanaman kopi dari bibit yang kami sumbangkan. Kopi dengan status TM sudah berbuah dengan rerata setiap pohon ada 7 cabang buah, setiap cabang ada 9 calon dompolan buah kopi. Petani mendapatkan bukti nyata jika menggunakan bibit unggu maka hasil buahnya juga unggul.
Coffee (Coffea sp.) is a plantation crop that is widely cultivated and an export commodity that has an important role for the economy in Indo-nesia. The productivity of coffee cultivation in Indonesia is still not optimal due to several factors, one of which is the lack of innovative tech-nology that can increase the production of coffee plants. An important phase in the cultivation of coffee plants is in the phase of young plants or immature plants in year 1. In this phase, proper maintenance treatment is needed for the purpose of preparing the plant for optimal growth. The application of technology to increase the production of coffee plants can be done through the application of Bacillus sp. which can func-tion as bacteria that can stimulate plant growth and by using superior clones. The purpose of this study was to determine the effect of Bacillus sp. on the growth of immature plants in year 1 on several robusta coffee clones. The method of this research was using split plot design which was arranged in a randomized complete block design (RCBD) with 2 factors and 3 replications. Factor I as the main plot consisted of several clones with 4 levels, namely the Cabutan clone, BP 409, BP 936, and BP 939. Factor II as the subplot was the concentration of Bacillus sp. consisted of 3 levels, namely 0 gr/l, 30 gr/l and 60 gr/l. The results of this study indicate that there is no interaction between the application of Microbial Bacillus sp. with some of robusta coffee. While the application of Bacillus sp. significantly increase stem diameter and there were differences in the growth characteristics of several coffee clones on all observed variables.
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