Vol. 51—1997 - NorthEastern Weed Science Society

Waggoner December 24, 1994
146
350 r---------------~
300
250
(U
.t.: 200
c:
Fed
pgm
It.
F ifor
falow
50
o
1932 1940 1948 1956 1964 1972 1980 1988
Fig 13. In
harvested
cropland i
is the pro
per capit
cro land.
Acknowled
Universit
Technolog
Report 12
Nature?"
Robert Sw
the U.S. beginning in 1932, the course of
nd failed or summer fallow cropland and the
led by Federal programs. The land labeled Spared
uct of the population multiplied by the cropland
in 1932 less the above three categories of
(Dau hert 1987 and Sandretto 1994).
ents: I thank Jesse Ausubel of Rockefeller
and the Council for Agricultural Science and
for unfailing support and publication of CAST
, "How much land can ten billion people spare for
thank John Ahrens, Bill Barrentine, Ellery Knake,
et and Wayne Wright for tutoring me in weeds.
Blackman, R E. 1994. Differential competitive ability of
winter wh at cultivars against downy brome. Agron J 86:649­
654;
Borlaug, E. 1987 Making institutions work--a scientist's
viewpoint. In W R Jordan (ed) Water and water policy in world
food supp ies. Texas A&MUniv Press, College Station TX. p
387-395.
Brown, L . 1988. The changing world food prospect: the
nineties nd beyond. Worldwatch Paper 85. Worldwatch
Institute, Washington.