APPENDIX A

UNITS OF MEASURE


1 bu = 2150.42 cu in = 32 qt
1 bu = 56 lb shelled maize = 68 to 72 lb ear maize (Myrick 1903:368)
1 qt = 1988.2 kernals of maize (approximately) (U.S. Commissioner of Patents 1848:130)
1 quintal (US) = 100 kg = 220.46 lb = 3.937 bu shelled maize
1 acre = 43,560 sq ft
1 ha = 2.471 acres
1 quintal/ha = 1.593 bu/acre
1 kg/ha = 0.015933 bu/acre
1 bu/acre = 62.7628 kg/ha