Kaciene, G., Kiksaityte, A., Januskaitiene, I., Miskelyte, D., Zaltauskaite, J., Sujetoviene, G., Sakalauskiene, S., Miliauskiene, Juozapaitiene, G. and Juknys, R. 2017. Different crop and weed performance under single and combined effects of elevated CO2 and temperature. Crop Science 57: 935
One of the tactics utilized by climate alarmists in their attempt to disparage or downplay the growth-enhancing benefits of atmospheric CO2 enrichment is to suggest that weeds will become ever more aggressive in the future as the air's CO2 content continues to climb, making them greater threats to the wellbeing of both natural ecosystems and farming operations. But is this contention correct?
To determine whether elevated carbon dioxide levels and higher temperatures will “differentially affect crop and weed species,” Kaciene et al. grew peas, barley, and the weed wild mustard in a controlled environment under ambient carbon dioxide levels of 400 parts per million (ppm) and elevated levels of 700 ppm and 1400 ppm under ambient and elevated temperatures.
The researchers found higher carbon dioxide conditions elevated the growth and water use efficiency of pea and barley plants, while the wild mustard experienced insignificant gains. The researchers concluded, “crops … take a considerably higher advantage from elevated carbon dioxide compared with weed species,” even under conditions of elevated temperatures.
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