Root growth

In a recent review of 167 studies on root response to elevated [CO2], Rogers et al. (1994) found that root dry weight increased in about 87% of the studies and plant roots were longer or more numerous in 77% of the studies. In cassava (Manihot esculenta Crantz), a tropical root crop, there was not only a large increase in growth (150%), but partitioning to the root was also increased. Overall, however, effects of CO2 enrichment on root/shoot ratio and partitioning have been highly variable and may differ between C3 and C4 crops (Rogers et al., 1997; Wolfe et al., 1998). This topic is discussed further in the potato case study.

Whether or not root/shoot ratios in mature plants are increased by high [CO2], rooting and establishment could be enhanced in both vegetatively propagated material and in transplants. Enhancement should result both from increased carbohydrate availability and from decreased stomatal conductance. For example, elevated [CO2] during propagation increased root number and length in sweet potato slips (Bhattacharya et al., 1985). Since propagation and establishment are critical phases for many vegetable crops, especially in terms of increasing uniformity and early yield, increases in these processes from elevated [CO2] would be particularly valuable.

Guide to Alternative Fuels

Guide to Alternative Fuels

Your Alternative Fuel Solution for Saving Money, Reducing Oil Dependency, and Helping the Planet. Ethanol is an alternative to gasoline. The use of ethanol has been demonstrated to reduce greenhouse emissions slightly as compared to gasoline. Through this ebook, you are going to learn what you will need to know why choosing an alternative fuel may benefit you and your future.

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