Sentences with phrase «soil nitrogen»

For example, once a tree has essentially as much CO2 as it can use, other conditions such as soil nitrogen availability, will become limiting.

By Cheryl Mackowiak, IFAS Extension, University of Florida Given the challenges of excessive water, are there ways we can determine, after significant rain events, if soil nitrogen has leached beyond our crop's root zone?

Litterfall 15N abundance indicates declining soil nitrogen availability in a free - air CO2 enrichment experiment.

«Understanding soil nitrogen management using synchrotron technology.»

Soil nitrogen expert Eric Davidson, a scientist at the Woods Hole Research Center in Falmouth, Mass., who was not involved in the study, said the finding is important because it focuses scientists, policymakers and farmers on making reductions where they will make the most difference.

«In our research, we have found that cover - crop mixtures that excel at nitrogen retention can decrease soil nitrogen supply to cash crops and limit their yield.

«These harness the best of organic farming combined with new technologies to better monitor the nutritional status of soils and plants and to recycle waste and with the promise of new wheat varieties able to utilise soil nitrogen more efficiently.»

In addition, corn plants deplete soil nitrogen, which must be replaced by constant doses of fertilizer.

Koven CD, Lawrence DM, Riley WJ (2015) Permafrost carbon − climate feedback is sensitive to deep soil carbon decomposability but not deep soil nitrogen dynamics.

«We know that biochar impacts the soil nitrogen cycle, and that's how it reduces nitrous oxide,» said Masiello, a professor of Earth, environmental and planetary science.

Since changes in the soil nitrogen cycle are driven by microbes, could bacteria associated with invasive species not only be responsible for the observed changes in soil nutrient concentrations, but also for enabling the continued growth and persistence of the invader species?

Long - term growth In a 13 - year field experiment on 296 open - air plots, the researchers grew perennial grassland species under ambient and elevated concentrations of both atmospheric CO2 and soil nitrogen.

Soil nitrogen and phosphorus levels have doubled in the last century because of agricultural use, and even in places where agriculture does not happen the nitrate levels in the lakes of Greenland are higher than at any time in the last 10,000 years.

The soil nitrogen levels in the organic farming systems increased 8 to 15 percent.

In a 13 - year field experiment on 296 open - air plots, the researchers grew perennial grassland species under ambient and elevated concentrations of both atmospheric CO2 and soil nitrogen.

The relationship between GPP and NEP appears to be so strongly controlled by the nutrient status of the forest that terrestrial biosphere models may be unable to accurately predict the carbon balance of forest ecosystems without information on background nutrient availability27 — soil nitrogen, phosphorous, potassium, pH — and on changes in soil and plant nutrient cycling resulting from human activities (such as nitrogen deposition, climate change and elevated CO2).»