Farm Book, page 86
by Thomas Jefferson

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Indian corn.

1. gallon of plaister mixed in tar suffices to roll 1. bushel of corn.
1. bushel of corn plants 8. acres of ground in drills 5 1/2 f. apart, with single plants
at from 18 I. to 30 I.. or say 2. f. distance in the drill.
so that 1. pint of plaister is enough for an acre.