Effects of Chitooligosaccharide on Growth and Yield of Lettuce (Lactuca sativa L.) cv. Green Cos

The effects of chitooligosaccharides (COS) on growth and yield of greencos salad were studied. The experimental design was 3×2 Factorial in Completely Randomized Design (CRD) with 2 factors: Factor 1 was concentration of COS at 1, 2 and 4 ml/L and Factor 2 was administration of COS at 7 and 14 days after planting together with the control (no chitooligosaccharides) using 4 replications. The results showed that COS administration at the rate of 4 ml/L and spraying every 14 days gave the highest fresh weight of greencos salad (134.78 g) when compared to COS at the rate of 4 ml/L and spraying every 7 days, COS administration at the rate of 2 ml/L and spraying every 7 and 14 days and COS 1 ml/L and spraying every 7 and 14 days, respectively. The control (no COS) gave the minimum fresh weight of 91.87 g.