ISHS Acta Horticulturae 644: International Symposium on Growing Media and Hydroponics
COMPARISON OF TWO NUTRIENT SOLUTIONS’ EFFECT ON GROWTH AND NUTRIENT LEVELS OF LETTUCE (LACTUCA SATIVA L.) CULTIVARS |
| Authors: | M.S. Karimaei, S. Massiha, M. Mogaddam |
| Keywords: | Lactuca sativa L., Hydroponic system, nutrient solutions, growth parameters and ion ratios |
| Abstract:
Hoagland, a well known and commonly used solution was compared with a solution that is suggested by Massantini et al. (1988) for soilless culture of lettuce. Massantini solution was applied in two concentrations (complete, 100%, and half, 50%, strength). Plants were harvested before heading and their growth characters and N, P and K concentrations with their ratios were determined. Hoagland nutrient solution had the strongest effect, followed by Massantini 50%. N and P concentrations in lettuce plants grown on Hoagland solution, were closer to DRIS (Diagnosis Recommendation Integrated System) norms of lettuce. Growth rate, most of growth characters and N, P and K concentrations were negatively correlated with the solution pH in most cultivars. Solutions EC showed negative correlation with some growth characters such as leaf number, leaf dry weight and K concentration. pH and EC of Hoagland solution were closer to those which have been suggested for soilless culture of lettuce. The black seeded cultivar had more leaf number than the others on all nutrient solutions, especially in Massantini 50%. The highest total dry weight of leaves referred to the black seeded cultivar on Massantini 50% solution but there was no significant difference between this treatment and Olimpo cultivar on Hoagland nutrient solution. | |
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