Results 231 to 240 of about 537,886 (286)

Nutrient Balances of Rewetted Fens – Groundwater Lysimeter Results 

XXV International Grassland Congress (IGC 2023), 2023
With the raising of groundwater levels to protect fens and the climate, there may be a risk of nutrients, such as nitrogen or potassium, leaching into the groundwater. Great amounts of nutrients, which are accumulated largely by peat forming plants like Phragmites australis and Carex spec., are conveyed into rewetted fens through high amounts of ...
Hoysagk, J., Pesch, M., Eulenstein, F., Behrendt, A.   +3 more
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Efficient use of nutrients: an art of balancing

Field Crops Research, 1998
Abstract Nutrient-use efficiency is conceived as the product of uptake efficiency, i.e., the ratio of actual uptake to potential supply, and utilization efficiency, i.e., the ratio of yield to actual uptake. Both depend on the availability of the nutrient in relation to other growth factors, and require N, P and K perfectly in balance to reach their ...
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Treatment for Obesity: A Nutrient Balance/Nutrient Partition Approach

Nutrition Reviews, 2009
This paper examines the treatment of obesity, using a feedback model of nutrient regulation. A feedback model contains afferent signals and a central controller that transduces afferent information into efferent signals that modulate the controlled system.
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Hypothalamic Nutrient Sensing and Energy Balance

2009
Hypothalamic neurons have the capacity to sense and alter their activity in response to fluctuations in local nutrient concentrations. Alterations in glucose, fatty acid and amino acid concentrations have all been demonstrated to affect neuronal excitability and/or intracellular signaling pathways.
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The use of nutrient audits to determine nutrient balances in Africa

Food Policy, 2004
Abstract A model, designed to carry out soil nutrient audits, has been used to calculate nutrient balances for Africa for the period 1961–1998 for land used for arable and permanent crops. The model indicates that in Africa and most African countries, nutrient depletion has been increasing and in 1998 was 3.5 million tonnes nitrogen (17.4 kg N ha −1
Sheldrick WF, Lingard J
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Ecosystem Nutrient Balance and Dynamics

2000
Many attempts at balancing ecosystem-level nutrient budgets have been made in the past few decades using a variety of approaches, and for a variety of different purposes. Relatively simple mass balance equations have been used at the level of the watershed that might comprise single forested ecosystems (e.g., Binkley et al. 1982; Stohlgren et al. 1991;
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Nutrient Cycles and Mass Balances

2013
Chemical elements without a prominent gaseous phase at normal biologic temperature, such as calcium, magnesium, and potassium, have what is referred to as a sedimentary biogeochemical cycle (Odum 1959). That is, flux and cycling are affected primarily by hydrologic factors (including dissolution, erosion, and sedimentation), landslides, vulcanism, and ...
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Balance of nutrients: Is more better?

Science Translational Medicine, 2016
Changes in maternal plasma folate concentrations affect genome-wide DNA methylation status of the fetus.
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Balancing nutrient supply and nutrient requirements in grazing sheep

Small Ruminant Research, 2010
Abstract Attempting to achieve a balance between the supply of and requirements for the major nutrients implies that demands for major nutrients can be adequately quantified, that the nutritive value of the consumed diet can be described in similar terms and that the diet actually consumed by the grazing sheep can be estimated, or at least predicted,
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