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) Kimberley Environmental Horticulture Incorporated Kimberley Environmental Horticulture (KEH) is a small group of committed individuals who promote the use of indigenous plants for the landscaping of parks and gardens. Rehabilitation of Kimberley coast, bushland and pastoral regions are also high on our agenda. This includes planting seedlings, weed control, damage from erosion or any other environmental matter that comes to our attention. We come from all walks of life, from Professionals and Trades oriented occupations, Pensioners and Students, Public Servants and the Unemployed. We have a community plant nursery where we trial many old and new species, with a view to incorporating these into our landscaping trials. Our labour force are mainly volunteers, but with considerable help from the 'work for the dole' program, Indigenous Community Development Employment Program (CDEP) groups and the Ministry of Justice, with their community work orders; in this way we manage to train many people in the horticultural skills needed for indigenous plant growing. We constantly undertake field trips that cover seed and plant collection in the Kimberley. Networking around the Kimberley region and the east Pilbara is a necessary part of promoting our activities. We consult on a range of Environmental and Landscaping matters that deal with our region. Our activities involve improving Broome's residential streetscapes by including 'waterwise' priciples in planting out nature strips. Sustainable environmental horticulture is practised by members of our group. We use existing vegetation as the backbone of any plantings, using these species to advantage when planning to develop tree forms or orchards. The Broome region is sensitive to development. Subsequently many weed species have become dominant in and around developed areas. The use and movement of heavy machinery is the biggest single cause of environmental degradation. We dont live in a 'Tropical Paradise' but on the edge of the Great Sandy Desert. The plants that survive best here, grow in well-drained pindan sand, and are found from the Dampier Peninsular southward to where average rainfall is below 600mm. When we use rainforest species, detail is important when planting, water catchment, sunlight and understorey species are all considered. The use of recycled 'grey' water is an advantage here as well as treated waste-water, although many local species do not fare well with nutrients from this source. We use waterwise planting methods which include harvesting asmuch rainwater as possible, with swales designed to hold up to 200 litres, to help recharge the local groundwater aquifer. There has been a serious decline in this aquifer over the last few years. With the fast expansion of the Broome peninsular, more and more land is being covered by concrete, iron and bitumen so that much less water is available to replenish the aquifer, allowing the salt content to become significantly higher. The small Broome Peninsular is on the south-western corner of the Dampier Peninsular (bound by Broome, Derby and Cape Leveque at the northern tip). Compaction by vehicles also inhibits water retention due to the content of our local pindan sand, hard as concrete in the dry, going to soft and sloppy mud after rain. None of us are botanists, inevitably we have got some names wrong, names changed, or have not gone to sub-species level. If you note a photo or description may be wrong, please e-mail to kimenvhort@yahoo.com.au
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