Abstract
Research on the effect of organic fertilizer combination, seaweed fertilizer and compost, on the growth of head lettuce plants has been conducted. The treatment in the study was head lettuce fertilizing with compost and seaweed fertilizer in ratio 2:0, 1:1, and 0:2. Land used for head lettuce without fertilizing treatment as control. The study was intended to get the best combination of organic fertilizer for head lettuce growth. The results showed that the best fertilizer formula was obtained from a combination of compost and seaweed fertilizer in ratio 2:0. Growth indicator as a result are average of leaf length of 26.64 cm, leaf width of 25.48 cm, 40 number of leaves, weight 311.75 g, and moisture content of 93.51%.Compost can stabilized acidity of planting land but the present of seaweed fertilizer can stabilized humidity of planting land and does not indicate the presence of fungi and parasites.
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