The use of organic manure for iceberg lettuce plants grown in substrates

摘要

This research was carried out to compare inorganic nutrient solution as traditional hydroponic nutrition method with organic manure in substrate culture. The experiment was designed according to the split-split-plot design with 3 replicatees. Main plots, subplots and sub-subplots were assigned to nutrition methods (1. inorganic nutrient solution, 2. organic manure), substrates (1. perlite + clinoptilolite, 1:1; 2. perlite + clinoptilolite, 3:1; 3. tuff + clinoptilolite, 1:1; tuff + clinoptilolite, 3:1, v/v), and iceberg lettuce cultivars (1.Bombola, 2.Gloria), respectively. Cow manure was used as the source of organic manure and mixed to substrate before planting at 200 g per plant. During the growing season, only water was applied to the plants in organic manure treatment, whereas complete nutrient solution was applied to control plants daily via drip irrigation system. Chemical content of complete nutrient solution was as follows (mg/l): N 150, P 50, K 150, Mg 50, Ca 150, Fe 5, Mn 0.5, Cu 0.03, Zn 0.05, B 0.5 and Mo 0.02.