From Gene Logsdon (1985)
Garden Farm Skills
A hundred years ago, hotbeds were used profitably near large cities to grow two crops of lettuce through winter, and then a crop of bedding plants for setting on in the garden in spring. As long as horse manure was available, and of course it was in great quantities, these hotbeds produced lettuce at the rate of forty to fifty heads per 3 by 6-foot bed at far less cost than it takes today to ship lettuce from warm-winter states or raise it in greenhouses. Farmers near such cities as Boston and New York operated as many as a thousand beds, providing jobs for many people and making a good profit, with the expenditure of very little fossil fuel.
This great article provides all the how-tos. But I gotta wonder what he's got against chicken manure. Talk about heating up!! And the urine comes pre-mixed.
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