more CO2 gives a massive boost to corn …

Increased atmospheric CO2  is a massive boost to crop yields of up to 127%, whilst using less water. It’s a pity the Green false agenda wants to waste it all turning corn into ethanol.

Benefits of Atmospheric CO2 Enrichment on Maize — Summary (29 December 2015)
Nearly all agricultural species — including C4 plants — respond positively to increases in the air’s CO2 content by displaying enhanced rates of photosynthesis and biomass production, as well as higher rates of water use efficiency. This summary reviews some of the impacts of these and other related phenomena as they pertain to the C4 crop species of corn (Zea mays L.), or maize as it is often called…

Check it out at co2science. A small excerpt here, with my bolding:

This summary reviews some of the impacts of these and other related phenomena as they pertain to the C4 crop species of corn (Zea mays L.), or maize as it is often called.

Vanaja et al. (2015) investigated the growth and yield responses of three different maize (Zea mays L.) genotypes — DHM-117 (a single cross hybrid), Varun (synthetic) and Harsha (composite) — when exposed to ambient air containing 390 ppm of CO2 or enriched air containing 550 ppm of CO2. As illustrated in the figure below, the nine Indian researchers report that (1) “the improved grain yield due to 550 ppm CO2 was 46% in DHM-117, 61% in Varun and 127% in Harsha as compared with the ambient control,” that (2) “the improvement in grain yield was contributed by both increased grain number to the extent of 34%, 25% and 72% as well as enhanced test weight by 8%, 29% and 60% in DHM-117, Varun and Harsha respectively,” and that (3) “elevated CO2 also significantly improved the harvest index [Hi] of maize genotypes to the extent of 11% (DHM-117 and Varun) to 68% (Harsha).”


The impact of a 160 ppm increase in CO2 (550 ppm) on various growth and yield parameters of three maize genotypes (DHM-117, Varun and Harsha). Adapted from Vanaja et al. (2015)

As a result of these observations, Vanaja et al. concluded — in the final sentence of their paper — that “the positive and significant response of elevated CO2 on maize harvest index was due to higher partitioning of biomass towards reproductive parts rather than vegetative parts,” leading them to further conclude that this response “makes this crop more climate resilient.” […]

 

Read all this too:

Growth and Yield of Three Maize Genotypes in CO2 Enriched Air (29 December 2015)
In spite of the fact that the three maize genotypes of this study are C4 plants — which are typically somewhat less responsive to atmospheric CO2 enrichment than C3 plants — this report of a study conducted in India suggests that such need not always be the case…

About Tom Harley

Amateur ecologist and horticulturalist and CEO of Kimberley Environmental Horticulture Inc. (Tom Harley)
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