This section is from the book "Vegetable Gardening", by Ralph L. Watts. Also available from Amazon: Vegetable Gardening.
Prices paid for horse manure vary considerably. A Long'IsIand market gardener is paid over $400 a year to remove the manure daily (except Sunday) from a stable feeding a great many horses. Thus he secures hundreds of tons during the year. Many other Long Island gardeners pay from 25 to 50 cents a load, the loads varying from two to four or more tons each. Boston market gardeners are charged from $1 to $1.50 a load of three to five tons. Cleveland growers pay 25 to 50 cents a load of two tons. Near Philadelphia market gardeners who haul it from the stables pay 25 to 50 cents a load of about two tons. When shipped 10 to 50 miles from Philadelphia the price delivered on the railroad sidings varies from $1.85 to $2.15 a ton. In New Jersey, prices are variable, but with freight charges the cost usually exceeds $2. When delivery on barge is possible the rate is perhaps 25 per cent lower. A grower on the eastern shore of Maryland pays about $3 a ton for New York or Philadelphia manure delivered at his farm siding. In most of the smaller cities and towns the price varies from 50 cents to $1 a ton.
 
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