Effect of root-zone cooling on the cultivation of butterhead lettuce in dynamic root floating hydroponic system
Effect of root-zone cooling on the cultivation of butterhead lettuce in dynamic root floating hydroponic system
Poh, B.L.; Pek, H.H.; Leong, W.H.
Singapore Journal of Primary Industries 26: 41-46
1998
Butterhead lettuces (15 new cultivars and 2 standard cultivars) were grown in hydroponics under both cooled (20 degrees C) and non-cooled conditions (28 degrees C) to explore the possibility of cooling the root zones to reduce tip-burn and bolting. Cooling of the nutrient solution to 20 degrees C increased biological yields for all cultivars but for marketable yields, only 4 cultivars (Winter Strain, Palma, Casparo and Buttercrisp) were comparable to the standard cultivars, Panama and Pansoma.