CO2, an irrigation farmer’s delight …

More timely benefits of increased CO2, from co2science.

In a timely and most interesting paper, Deryng et al. (2016) report that rising atmospheric CO2 concentrations are expected by many to enhance photosynthesis and reduce crop water use,” but they write that “there is high uncertainty about the global implications of these effects for future crop production and agricultural water requirements under [projected] climate change.” Thus, they go on to combine the results obtained for networks of field experiments and global crop models in order to derive a global perspective on crop water productivity (CWP) — which is the ratio of crop yield to evapotranspiration — for wheat, maize, rice and soybeans under elevated CO2 and the associated climate change that is typically projected for a high-end greenhouse-gas emissions scenario. And what did they learn by so doing?

This exercise suggested, as the sixteen scientists report, that “the projected increase in the air’s CO2 concentration would likely increase global CWP by 10-27% by the 2080s, with particularly large increases in arid regions (by up to 48%, for example, in the case of rain-fed wheat).” And they add that “if realized in the fields,” the effects of elevated CO2 could considerably mitigate global yield losses while reducing agricultural consumptive water use by 4-17%.

In closing, the four US and twelve European researchers write that their findings “quantify the importance of CO2 effects on potential water savings and, in so doing, highlight key limitations of global hydrological models that do not consider effects of CO2 on evapotranspiration.” And, therefore, they further state that their results “demonstrate the need to expand field experiments and encourage greater consistency in modelling the effects of rising CO2 across crop and hydrological modelling communities,” which efforts would likely suggest potentially positive outcomes.

(My bold) Paper Reviewed
Deryng, D., Elliott, J., Folberth, C., Muller, C., Pugh, T.A.M., Boote, K.J., Conway, D., Ruane, A.C., Gerten, D., Jones, J.W., Khabarov, N., Olin, S., Schaphoff, S., Schmid, E., Yang, H. and Rosenzweig, C. 2016. Regional disparities in the beneficial effects of rising CO2 concentrations on crop water productivity. Nature Climate Change 6: 786-790.

Rainfall has been amazing across Australia for a decade now, ever since ‘climate activist’, Tim Flannery, declared Australia’s new permanent drought in 2007. So, this information is useful for the next drought period.

How Four Plant Species of Australia Respond to Declining Rainfall (10 February 2017)
It is believed by many that a decline in rainfall must ultimately drive various plant species from regions where they currently are found. But such may not always be the case. In fact, it may well be the exception


Ord River irrigation channel

Glassy-eyed” Leftists are hell-bent on destroying productivity with their insane carbon policies.

Update. Somebody should tell them, CO2 is not pollution, but a highly beneficial molecule that benefits us all. Oh, wait, they’ve already been told!

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
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One Response to CO2, an irrigation farmer’s delight …

  1. Pingback: CO2, an irrigation farmer’s delight … | pindanpost | Cranky Old Crow

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