Limited agricultural land areas combined with increasing demands for food require breakthroughs in land use development using agroforestry systems. Intercropping root crops with trees could be an alternative for food production in forest areas. This study aimed to assess the feasibility of cocoyam (Xanthosoma sagittifolium (L.) Schott) farming on dry land within 12- and 42-year-old teak (Tectona grandis L.f.) forests to support local food security. The feasibility assessment took into account both productivity and socio-economic aspects. The agroforestry land productivity was measured using the land equivalent ratio (LER), and our analysis of the cocoyam farming within the teak stands was carried out using the revenue/cost ratio (R/C) at the demonstration plot scale. Furthermore, we also surveyed farmers’ perceptions of the production of cocoyam for food security. The results showed that the R/C values of cocoyam tuber production in agroforestry systems were lower than 1. However, the production rates of cocoyam tubers in the 12-year-old teak stand (48.3% light intensity) and the 42-year-old teak stand (62.5% light intensity) were 2.64 and 2.76 tons/ha, respectively. The overall yields from the teak and cocoyam agroforestry systems were more profitable than those of the monoculture system, as indicated by the LER values of 1.61 and 1.85. Cocoyam production was socially acceptable (77% of respondents) as a smallholder subsistence agroforestry practice to meet food demand. Increasing cocoyam productivity in teak forests requires the adoption of agroforestry silvicultural technology to achieve food security for rural communities. To increase their farming production and income, farmers could apply intensive silvicultural practices. Governmental support that could be provided includes encouraging product diversification and providing assistance for the processing and marketing of cocoyam products.

Kotoran sapi perah yang tidak diolah dengan benar dapatmencemari lingkungan serta memengaruhi produksi dan kualitassusu. Limbah peternakan ini dapat dimanfaatkan sebagai sumberenergi alternatif untuk mensubstitusi kebutuhan energi fosil yangsemakin meningkat dan ketersediaannya makin terbatas. Biogasmerupakan sumber energi terbarukan yang dihasilkan dari prosespengolahan limbah pertanian maupun peternakan. Makalah inimengulas alternatif pemanfaatan kotoran sapi perah sebagai biogas.Pengolahan kotoran ternak menjadi biogas memberikan banyakmanfaat, yakni sebagai sumber energi alternatif, pupuk organikpadat maupun cair, dan pakan ternak, serta dapat memperbaikisanitasi lingkungan. Oleh karena itu, pembuatan biogas perludimasyarakatkan terutama di sentra sapi perah. Biogas lebih murahdibandingkan sumber energi lain sehingga peternak lebih baikberinvestasi membangun digester secara swadaya dibandingkanmembeli gas elpiji. Pemerintah dapat memberikan subsidi digesterkepada peternak sapi perah untuk mengurangi ketergantungan padaelpiji. Perbaikan teknologi biogas, integrasi sistem biogas denganproduksi pupuk organik, serta sosialisasi dan bimbingan teknisproduksi dan pemanfaatan biogas dapat memperluas pengembanganbiogas di masyarakat. Peminjaman kredit lunak dari pemerintahmaupun swasta juga dapat mendorong pengembangan biogas.

Persentase stolon menjadi umbi pada produksi umbi mini kentang secara aeroponik diperkirakan hanya 5–10%, sehingga masih terdapat peluang untuk meningkatkan produksi umbi mini dengan melakukan induksi pengumbian. Penelitian bertujuan untuk meningkatkan produksi umbi mini kentang melalui peningkatan induksi pengumbian dengan berbagai dosis pupuk daun nitrogen. Percobaan dilaksanakan di Rumah Plastik di Lembang, Bandung Barat, Jawa Barat mulai Bulan Desember 2010 sampai dengan Juli 2011. Percobaan menggunakan rancangan acak kelompok dengan satu faktor dosis pupuk daun nitrogen yaitu 0, 500, 1000, 2000, dan 4000 ppm N dengan enam ulangan. Pupuk nitrogen yang digunakan ialah Ca(NO3)2 yang diaplikasikan 1, 2, 3, dan 4 minggu setelah tanam. Hasil penelitian menunjukkan bahwa pupuk daun nitrogen Ca(NO3)2 dapat meningkatkan produksi umbi mini kentang melalui peningkatan bobot umbi per tanaman sebesar 17%, tetapi belum dapat meningkatkan induksi pengumbian tanaman kentang pada sistem aeroponik. Dosis optimum pupuk daun nitrogen Ca(NO3)2 untuk bobot umbi per tanaman maksimum ialah 2173 ppm. Peningkatan bobot umbi mini per tanaman pada sistem aeroponik dapat memberikan manfaat sebagai sumber benih.

Centella asiatica is an herbal plant with many health benefits due to the content of asiaticoside compounds. Factors affecting asiaticoside content are altitude, soil texture, and soil nutrient status. This research aimed to identify the effect of zeolite, P₂O₅ fertilizer, and soil media from different altitudes on C. asiatica. The research was conducted in a greenhouse from August 2017–June 2018. The experimental design was a factorial, completely randomized design with three factors and four replications. The first factor was soil media that originated from 100, 450, and 900 m above sea level (asl), the second factor was the dose of P₂O₅ fertilizer (0, 27, 54, and 81 kg ha⁻¹), and the third was the dose of zeolite (0, 3, and 6 t ha⁻¹). The results showed that applying zeolite minerals at all altitudes increased nutrient availability and soil cation exchange capacity (CEC) by up to 70%. The novelty of this study is that the soil from an altitude of 900 m asl, with a P₂O₅ fertilizer dose of 54 kg ha⁻¹, has a loamy sand soil texture and produces the highest asiaticoside content (3.61%) and the largest plant dry weight (19.24 g). These results did not significantly differ from those obtained from the soil 450 m asl with a sandy loam soil texture (the most suitable soil texture for C. asiatica), that is 3.37% asiaticoside and 19.87 g plant dry weight. This study concluded that C. asiatica could develop in loamy sand soil by giving it 54 kg ha⁻¹ P₂O₅ fertilizer.

The low production of Atlantic as processed variety has prompted efforts to introduce varieties as well as the creation of new varieties. The purpose of this study was to examine various alternatives of processed potato varieties that have the potential in the highlands of Garut, West Java. The research was conducted in Cikajang, Garut, West Java, from December 2017 to March 2018. The research used a randomized block design with eight varieties and four replications. The varieties tested were Blis, Atlantic M., Medians, Granola L, AR8, AR7, Amabile, and Atlantic. The observed variables were height plant at 2, 4, 6, and 8 WAP, number of tuber by size, and tuber weight. The data was tested with the F test and if it was significantly different, it was continued with the orthogonal contrast test at the 5% level. Heatmap analysis was performed using the R Studio program The result showed that Granola was not significantly different from all processed varieties. There were three groups of processed varieties, namely the first group, Amabile. The second was AR 7, Medians, and Blis. The third was Atlantic M, Atlantic, and AR 8. Amabile variety had the highest production and number of large tubers.

True seed of shallot (TSS) can be an alternative source of shallot seeds. But the use of TSS in Indonesia is still limited because not many people produce TSS because of high input production. This research aimed to evaluate the technical and economic feasibility of input saving TSS production technology packages. The research was carried out in Ciwidey district, Bandung Regency, West Java, Indonesia from June to October 2016. The research consisted of two factors arranged in a split plot with a randomized block design and eight replications. The main plot was technology packages, namely farmer, recommendation and input saving. The subplot was harvest time, which were 80, 90, and 100 weeks after planting. The observed variables were yield component and yield, soil status, climate data, and farming data. The technical data were analyzed by ANOVA test and continued using the Duncan test at a 95% confidence level. Farming data was analyzed by RC ratio. The results showed that input saving package did not meet seed standards with an RC ratio of 1.07. Savings input on TSS production in Indonesia were only possible by choosing the right location and planting time and must be followed by climate prediction.