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Best Answer: a normal head of lettuce can weigh between 10oz, and 1 1/2 lbs. I should know I am addicted to lettuce. I eat it every single day. If you put three largish leaves, in your sandwhich the calorie content is small. A 1lb head of lettuce will have around 60 calories. So each leaf is around 5 calories. That is a normal sliced loaf size of bread. If it's a foot long, say at Subway, type thing, you have more lettuce- about five or sixe leaves, but they will be smaller leaves, so at most 30 calories.
Crisphead lettuce is a moderately expensive crop to produce with costs for production, harvesting, and marketing averaging $3,400 per acre (Smith and Taylor, 1991). Fertilizer accounts for about 10% of the total preharvest costs for lettuce (Smith and Taylor, 1991). During the last 15 years, considerable research has been conducted on lettuce fertilization on the organic soils of Florida with emphasis on the EAA. Optimum fertilization is important for maximizing yields and quality and for minimizing negative impacts to the environment resulting from overfertilization.