Sitawati
Agricultural land is limited in urban society nowadays and become one of problems in urban farming. Cultivation technique with verticulture with planting bag wall can be an alternative to increasing crop productivity by increasing plant population per unit area in the limited land. The higher plant population in verticulture will affect the humidity and irrigation process. This research was conducted to determine the effect of irrigation interval and number of plants per pocket, which is effective and efficient to the growth and yield of lettuce (Lactuca sativa var. Longifolia). This study was carried out in Tutur, Pasuruan East Java between February until May 2017. The experiment was arranged in split-plot design with main plot of irrigation interval (every 2, 3, and 4 days) and the numbers of plant per pocket as a sub plot. Parameters observed consist of plant length, leaf area, specific leaf area, fresh weight per plant, fresh weight per pocket, fresh root weight, fresh weight of upper part, plant dry weight, dry weight of upper part, root dry weight, and shoot/root ratios. The results showed that 2 and 4 plants per pocket bag were significantly positive effect on the growth of lettuce and 4 plants per pocket could increase fresh weight per unit area. In addition, the number of 4 plants per pocket with irrigation interval once every 2 days increased thefresh weight per unit area with value of B/C ratio of 4.7. © 2017 @ author (s).
Department of Agronomy, Faculty of Agriculture, Universitas Brawijaya Jl., Veteran, Malang, 65145, Indonesia
