Sentences with phrase «level for plant growth»

However, the changes in climatic conditions arising from climate change could represent a far more important factor here: i.e. temperatures that increasingly exceed the optimum level for plant growth, like those experienced this summer, shifts in the vegetation periods, and more frequent droughts.

potential production estimated production of a crop under conditions when nutrients and water are available at optimum levels for plant growth and development; other conditions such as daylength, temperature, soil characteristics, etc., determined by site characteristics

Not exact matches

Called AmazonFACE (Free - Air Carbon dioxide Enrichment), it's based on a simple idea: For 12 years, researchers will spray pure CO2 into instrumented plots in the rainforest northwest of Manaus, Brazil, raising ambient concentrations to 600 parts per million — a level the world could reach as early as 2050 — all the while taking meticulous measurements to determine how the gas affects the growth of plants.

A final experiment used a mutant that created an excess of an enzyme that degrades cytokinin, finding that a base level of plant cytokinin was also necessary for nematode growth.

Seedlings were assessed for number and biomass of cluster roots, plant size and growth, and foliar phosphorus levels.

For instance, this device can help us understand the mechanisms by which various inputs and treatments alter plant growth at the cellular level.

«For all types of ecosystem the results show that high carbon dioxide levels can impede plants» ability to absorb nitrogen, and that this negative effect is partly why raised carbon dioxide has a marginal or non-existent effect on growth in many ecosystems,» says Johan Uddling.

What's more, even if plant growth does rise overall, the direct and indirect effects of higher CO2 levels will be disastrous for biodiversity.

As I already mentioned, compost tea is essentially a probiotic for plants, providing a concentrated source of the organisms plants need for optimal growth and improving the nutrient levels and microbiome of the soil as well.

The weed - cutter meanwhile can be used on generic enemies, but is best saved for the deadly plant growths on some levels.

If CO2 levels are higher then plant stomata will tend to remain open for a * shorter * period of time since the plant will more quickly be able to absorb the CO2 required for growth.

Others include the fact that many plants have evolved a trick for concentrating CO2, called C4 photosynthesis, so higher levels make little difference to them, and that in the tropics very high temperatures can impede growth.

Schmitt and Happer say our current CO2 levels are «low by the standards of geological and plant evolutionary history,» they pine for the days when «Levels were 3,000 ppm, or more,» and note that commercial greenhouse operators boost CO2 levels to» 1,000 ppm or more to improve the growth and quality of their plants.&levels are «low by the standards of geological and plant evolutionary history,» they pine for the days when «Levels were 3,000 ppm, or more,» and note that commercial greenhouse operators boost CO2 levels to» 1,000 ppm or more to improve the growth and quality of their plants.&Levels were 3,000 ppm, or more,» and note that commercial greenhouse operators boost CO2 levels to» 1,000 ppm or more to improve the growth and quality of their plants.&levels to» 1,000 ppm or more to improve the growth and quality of their plants.»

As CO2 levels rise, photosynthesis flourishes & plants take in more CO2, sparking more plant growth, photosynthesis & CO2 uptake; win - win for Gaia.

CO2 is a necessity of life itself since it makes possible green plants, the basis for animal life on Earth, and improves plant growth at current atmospheric levels

Repeated Pleistocene Epoch ice ages covered much of North America, Europe and Asia under mile - thick ice sheets that denuded continents, stunted plant growth, and dropped ocean levels 400 feet for thousands of years.

For the plants and trees, returning to the pre-drought levels of growth can take months or even years.

Plants response to higher CO2 levels result in less water utilation for photosynthesis (esp C4) which results in large gains of leaf growth (more growth for same water)-- forcing evapotranspiration to increase.

Is there a scientific basis for Robinson's claim that increased carbon dioxide levels will contribute to increased growth of some plants?

But according to Breakthrough Institute the highest rebound in energy use from efficiency occurs «not at the consumer level but in the productive sectors of the economy (industry and commerce) improving the efficiency of a steel plant may result in lower cost of steel, greater demand for steel, and also create greater economic growth - all of which will drive significant rebound in energy use following efficiency improvements.»

Speaking of which, is the current level of atmospheric CO2 better, or worse for plant growth and the biosphere?

But pollution also covers hundreds of chemicals which are fine or even beneficial at low levels but which if released in large quantities or in problematic circumstances cause «harm» — like phosphorus (grows your veges but also leads to toxic cyanobacterial blooms which kill cattle), nitrogen (grows crops kills many native species of plants and promotes weed growth costing farmers), copper (used as an oxygen carrier by gastropods but in high concentrations kills the life in sediments which feed fish), hormones like oestrogen (essential for regulating bodies but in high concentrations confuse reproductive cycles especially with marine life) or maybe molasses from a sugar mill (good for rum but when dumped into east coast estuaries used to cause oxygen sag in estuaries leading to massive fish kills).

Increased weed and pest pressure associated with longer growing seasons and warmer winters will be an increasingly important challenge; there are already examples of earlier arrival and increased populations of some insect pests such as corn earworm.64 Furthermore, many of the most aggressive weeds, such as kudzu, benefit more than crop plants from higher atmospheric carbon dioxide, and become more resistant to herbicide control.72 Many weeds respond better than most cash crops to increasing carbon dioxide concentrations, particularly «invasive» weeds with the so - called C3 photosynthetic pathway, and with rapid and expansive growth patterns, including large allocations of below - ground biomass, such as roots.73 Research also suggests that glyphosate (for example, Roundup), the most widely - used herbicide in the United States, loses its efficacy on weeds grown at the increased carbon dioxide levels likely to occur in the coming decades.74 To date, all weed / crop competition studies where the photosynthetic pathway is the same for both species favor weed growth over crop growth as carbon dioxide is increased.72

The claim that increased CO2 promotes crop yields is misleading in that plants may grow larger (and that growth eventually levels out and ceases), but increased atmospheric CO2 inhibits plants» abilities to uptake other critical nutrients (including nitrogen and phosphorus); thus resulting in plant nutrient deficiency and a deficiency for organisms that consume those plants.

A CO2 pulse in the atmosphere will take centuries to finally return to original levels, and that is completely ignoring any potential feedbacks from other parts of the system (ie temperatures raised for centuries could result in massve methane releases and loss of signficant low albedo ice sheets etc.) The experiments I am aware of that show improved plant growth in elevated CO2 levels require that all additional biological needs are amply provided for.

rooflite soil has the perfect level of water retention, porosity & drainage for enhanced stormwater retention & healthy plant growth

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For tree growth and recruitment, our study showed competition negatively affected tree growth and recruitment but no effects of climate change at the stand level were detected although studies from satellite data (40) showed that global warming facilitated plant growth.

A lowering of atmospheric carbon dioxide levels near the beginning of this time period occurred in response to the rise of land plants and likely cooled Earth, but the rapid growth of extensive Gondwanan ice sheets was delayed for tens of millions of years, until the Late Mississippian.»

The optimum level of CO2 for plant growth is about 5 times higher, 2000 ppm, yet the alarmists warn it is already too high.

As CO2 levels rise, photosynthesis flourishes & plants take in more CO2, sparking more plant growth, photosynthesis & CO2 uptake; a win for Gaia.

In fact, atmospheric CO2 levels at 400 ppm are approximately one - third the optimum required for plant growth as commercial greenhouses demonstrate by raising levels to 1200 ppm for increased yields.

Other researchers used historical (real - world) data for land use, atmospheric CO2 concentration, nitrogen deposition, fertilization, ozone levels, rainfall and climate, to develop a computer model that simulates plant growth responses for southern US habitats from 1895 to 2007.

I am looking for an exceptional opportunity for professional growth at the plant management level in a manufacturing environment in Kentucky or Southeast where I can make a positive difference by leading a team to improve manufacturing systems and processes; set a vision of success and apply my skills which I have used to increased profitability and reduced cost for other companies.