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This study aims to determinate: growth and yield of various varieties of lettuce planted with hydroponic cultivation of floating rafting raft system, growth and yield of various EC grades of lettuce grown with hydroponic cultivation of floating raft system, suitability of the Cobb-Douglas model for the production of hydroponic lettuce floating raft system. The research was conducted at the screen house of the Islamic boarding school Darussalam, Dukuhwaluh village, Kembaran District, Banyumas Regency. September to November 2016. This research is a screen house using split plot design, the main plot consists of EC (P), consisting of P1 = EC2; P2 = EC3; P3 = EC4, subplot are varieties (V), consisting of V1 = New grand rapids varieties; V2 = Red ava varieties; V3 = Chris green varieties. Based on the result of the study showed that the varieties showed differences in the number of leaves, root volume, chlorophyll content, plant wet weight, root wet weight and lettuce varieties which gave the best results for floating raft hydroponic systems by looking at plant height, leaf number, root volume, chlorophyll content, root length , plant wet weight, and root wet weight were Chris green varieties, the treatment of EC values shows the difference in the total N variable of the network with the value of EC 4. and the results obtained are 1.32%, the model of mathematical equations with Cobb-Douglas functions has not been able to validate research data due to high errors, so that the Y Model does not follow Y Observation Keyword : Modeling, lettuce, hydroponic floating rafts

Uji Model Produksi Cobb-Douglas Pada Pertumbuhan dan Hasil Selada Dengan Budidaya Hidroponik Sistem Rakit Apung