volume 28 issue 4 (december 2007) : 283-288
CROP WEED INTERACTIONS UNDER ENVIRONMENT STRESS A- REVIEW
1Water Management Research Centre, Belavatagi 582 208- India.
ABSTRACT
Crops and weeds compete with each other for the resources like water, light, nutrients etc. Due to human interventions climate is changing with increase in CO2, ozone concentration and temperature variation. Physiological basis for variation in the competing ability of crops and weeds is their C3 and C4 photosynthetic pathways. Increase in CO2 alone favors C3 crops and weeds, but any simultaneous increase in temperature will benefit C4 crops and weeds. Tropospheric ozone also reduces crop yield and some weeds like purple nutsedge are less sensitive to ozone. Efficient cultivars and herbicides are necessary to control weeds under changing environments.
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