Excess CO2 Impacts to Plants

Talbot Brooks tbrooks at uswcl.ars.ag.gov
Fri Nov 13 18:21:59 EST 1998


This is a multi-part message in MIME format.

------=_NextPart_000_0004_01BE0F20.C50B8830
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

    It is well documented that CO2 will increase carbon assimilation =
rate (photosynthesis) in C3 plants.  For wheat and barley, a 200 ppm =
increase in atmospheric CO2 can cause as much as a 30% increase in =
yield.  For sour orange trees, the results are dramatic: 175%!!!  The =
effect is of no beneficial gain beyond CO2 concentrations of 1000 ppm.  =
Beware that the increased growth caused by CO2 stimulation may have the =
following consequences: 1.  Dilution of sugars/ proteins in the plant =
causing a lowering of fruiting body nutritional quality; 2.  If you're =
growing a C3 plant, soil water requirements will be less than those of =
plants grown at ambient CO2 (so standard watering and fertilizer =
requirements may or may not shift); and 3.  If you grow a C4 (like corn =
or sorghum), the effect may not be worth the cost.  Check out the =
following references for additional info:

Pinter PJ, Kimball, BA, Garcia, RL, Wall, GW, Hunsaker, DJ, and LaMorte, =
RL (1996). Free-air CO2 Enrichment: Responses of Cotton and Wheat Crops =
pg 215-249 in Carbon Dioxide and Terrestrial Ecosystems. Koch, GW, and =
Mooney, HA eds. Academic Press, San Diego.

Kimball BA, Pinter PJ (Jr.), Garcia RL, LaMorte RL, Wall GW, Hunsaker =
D.J., Wechsung G., Wechsung F, and Kartschalls T (1995). Productivity =
and water use of wheat under free-air CO2 enrichment. Global Change =
Biology, 1, 429-442.

Kimball BA (1983). Carbon dioxide and agricultural yield: an assemblage =
and analysis of 430 prior observations. Agronomy Journal, 75, 779-88.

Idso KE, and Idso SB (1993), Plant responses to atmospheric CO2 =
enrichment in the face of environmental constraints: a review of the =
past 10 years=92 research. Agricultural and Forest Meteorology, 69, =
153-203.

These are all very readable papers.  If you can't locate them in your =
local library, let me know and I'll try to send some reprints your way.

Sincerely,

Talbot J. Brooks
Graduate Student Researcher
US Water Conservation Laboratory
4331 E. Broadway Rd.
Phx., AZ 85040

(602) 379-4356 ext. 262

tbrooks at uswcl.ars.ag.gov

visit the U.S. Water Conservation Laboratory home page at
http://www.uswcl.ars.ag.gov/

or search the Laboratory's Publication Listing at:
http://publications.uswcl.ars.ag.gov/pubs.htm


------=_NextPart_000_0004_01BE0F20.C50B8830
Content-Type: text/html;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
<HTML>
<HEAD>

<META content=3Dtext/html;charset=3Diso-8859-1 =
http-equiv=3DContent-Type>
<META content=3D'"MSHTML 4.72.3110.7"' name=3DGENERATOR>
</HEAD>
<BODY bgColor=3D#83a39b>
<DIV><FONT color=3D#000000><FONT size=3D2>&nbsp;&nbsp;&nbsp; It is well =
documented=20
that CO2 will increase carbon assimilation rate (photosynthesis) in C3=20
plants.&nbsp; For wheat and barley, a 200 ppm increase in atmospheric =
CO2 can=20
cause as much as a 30% increase in yield.&nbsp; For sour orange trees, =
the=20
results are dramatic: 175%!!!&nbsp; The effect is of no beneficial gain =
beyond=20
CO2 concentrations of 1000 ppm.&nbsp; Beware that the increased growth =
caused by=20
CO2 stimulation may have the following consequences: 1.&nbsp; Dilution =
of=20
sugars/ proteins in the plant causing a lowering of fruiting body =
nutritional=20
quality; 2.&nbsp; If you're growing a C3 plant, soil water requirements =
will be=20
less than those of plants grown at ambient CO2 (so standard watering and =

fertilizer requirements may or may not shift); and 3.&nbsp; If you grow =
a C4=20
(like corn or sorghum), the effect may not be worth the cost.&nbsp; =
Check out=20
the following references for additional info:</FONT></FONT><FONT=20
size=3D2></FONT></DIV>
<DIV><FONT color=3D#000000><FONT size=3D2></FONT></FONT><FONT=20
size=3D2></FONT>&nbsp;</DIV>
<DIV>
<P><FONT size=3D2>Pinter PJ, Kimball, BA, Garcia, RL, Wall, GW, =
Hunsaker, DJ, and=20
LaMorte, RL (1996). Free-air CO<SUB>2</SUB> Enrichment: Responses of =
Cotton and=20
Wheat Crops pg 215-249 in Carbon Dioxide and Terrestrial Ecosystems. =
Koch, GW,=20
and Mooney, HA eds. Academic Press, San Diego.</FONT></P>
<P><FONT size=3D2>Kimball BA, Pinter PJ (Jr.), Garcia RL, LaMorte RL, =
Wall GW,=20
Hunsaker D.J., Wechsung G., Wechsung F, and Kartschalls T (1995). =
Productivity=20
and water use of wheat under free-air CO<SUB>2</SUB> enrichment. Global =
Change=20
Biology, <B>1</B>, 429-442.</FONT></P>
<P><FONT size=3D2>Kimball BA (1983). Carbon dioxide and agricultural =
yield: an=20
assemblage and analysis of 430 prior observations. Agronomy Journal, =
<B>75</B>,=20
779-88.</FONT></P>
<P><FONT size=3D2>Idso KE, and Idso SB (1993), Plant responses to =
atmospheric=20
CO<SUB>2</SUB> enrichment in the face of environmental constraints: a =
review of=20
the past 10 years&rsquo; research. Agricultural and Forest Meteorology,=20
<B>69</B>, 153-203.</FONT></P></DIV>
<DIV><FONT color=3D#000000 size=3D2>These are all very readable =
papers.&nbsp; If you=20
can't locate them in your local library, let me know and I'll try to =
send some=20
reprints your way.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Sincerely,</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>Talbot J. Brooks<BR>Graduate Student =

Researcher<BR>US Water Conservation Laboratory<BR>4331 E. Broadway =
Rd.<BR>Phx.,=20
AZ 85040</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>(602) 379-4356 ext. 262</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2><A=20
href=3D"mailto:tbrooks at uswcl.ars.ag.gov">tbrooks at uswcl.ars.ag.gov</A></FO=
NT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>visit the U.S. Water Conservation =
Laboratory=20
home page at<BR><A=20
href=3D"http://www.uswcl.ars.ag.gov/">http://www.uswcl.ars.ag.gov/</A></F=
ONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>or search the Laboratory's =
Publication Listing=20
at:<BR><A=20
href=3D"http://publications.uswcl.ars.ag.gov/pubs.htm">http://publication=
s.uswcl.ars.ag.gov/pubs.htm</A><BR></FONT></DIV></BODY></HTML>

------=_NextPart_000_0004_01BE0F20.C50B8830--




More information about the Plantbio mailing list