Weed-Crop Competition A Review Second Edition by Robert L. Zimdahl



Bibliographic Information:
Title: Weed-Crop Competition A Review
Editor: Robert L. Zimdahl
Edition: 2nd
Publisher: Blackwell Publishing (Wiley)
Length: 229 pages
Size: 1.76 MB
Language: English



The primary impetus for the first edition of this
work twenty years ago came from my opinion,
formed from limited international experience in the
1970s, that many weed scientists in developing
countries did not receive and were not aware of current
weed science literature (see Zimdahl 1980).
They had limited or no access to journals commonly
found in libraries of the developed world. Thus,
they were denied use of printed resources that help
develop an historical perspective. Often, they did not
know what was known. An historical perspective
combined with the stimulation of current research
sharpens the focus of research programs and facilitates
their justification to administrators and funding
agencies. Lack of access to the literature can narrow
one’s perspective and usually impedes development
of good weed science programs.
Because no comprehensive review of weed-crop
competition had been published and because
approval had been given for the project by the International
Plant Protection Center at Oregon State
University, there was additional motivation for the
first edition.
The literature review for the present book began
in mid-2001 in the library of the International Rice
Research Institute (IRRI), Los Banos, Laguna,
Philippines. The review was completed and writing
began in late 2002. When the review began, I was a
Fulbright Scholar in the Department of Agronomy
of the University of the Philippines at Los Banos,
and Dr. James Hill, chair of IRRI’s Department of
Crop, Soil, and Water Sciences, graciously offered a
courtesy appointment and access to IRRI facilities.
The Philippines, a place where weeds grow abundantly,
was an appropriate location to begin to think
again about what may be the central hypothesis of
weed science: Weeds compete with crops and
reduce crop yield and quality.
This hypothesis is rarely stated in scientific
papers about weeds because it has dominated the
thinking in weed science for so long that it is
axiomatic. After all, if it were proven to be false and
if it were discovered that crops tolerated weeds, the
world would not need weed scientists. There would
be no problems with weed-crop competition. However,
the first edition of this book, published in 1980,
showed that weed-crop competition is real and its
effects had been studied in many ways, in many
crops, for many years. The hypothesis that weeds
negatively affect crop yield and quality has been
tested and verified; it is accepted.




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