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Nitrogen‐15 Variations in Fertilizer Nitrogen
Journal of Environmental Quality, 1974AbstractNitrogen‐15 concentrations of some commonly used nitrogen fertilizers are measured. Ammonium‐nitrogen has lower and nitrate‐nitrogen has higher 15N concentrations than atmospheric nitrogen. The mean difference between both is about 4 δ 15N.
H. D. Freyer, A. I. M. Aly
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Evaluating Decision Rules for Nitrogen Fertilization
Biometrics, 2000Summary. It is important, both for farmer profit and for the environment, to correctly dose nitrogen fertilizer for crop growth. Fertilizer recommendations are embodied in decision rules, which give a recommended dose of nitrogen (N) as a function of information available at the time the decision is made.
Antoniadou, T., Wallach, Daniel
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Canadian Journal of Plant Science, 1995
Two nitrogen (N) fertilizer response trials were superimposed, in 2 consecutive years, on a set of large plots of irrigated bromegrass (Bromus inermis Leyss.) that had been fertilized with different rates of fertilizer N up to 200 kg ha−1 for the previous 9 and 10 yr, respectively.
A. J. Leyshon, C. A. Campbell
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Two nitrogen (N) fertilizer response trials were superimposed, in 2 consecutive years, on a set of large plots of irrigated bromegrass (Bromus inermis Leyss.) that had been fertilized with different rates of fertilizer N up to 200 kg ha−1 for the previous 9 and 10 yr, respectively.
A. J. Leyshon, C. A. Campbell
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Nitrogen Fertilization of Ponds
Transactions of the American Fisheries Society, 1978Abstract Nitrogen fertilization failed to increase the production of bluegill (Lepomis macrochirus) and plankton in small experimental ponds (0.022 to 0.066 hectare) which were also fertilized with phosphorus. In an experiment conducted in larger ponds (0.57 to 10.32 hectares), nitrogen plus phosphorus fertilization was no more effective than ...
Claude E. Boyd, John W. Sowles
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Nitrogen Fertilization II: Fertilizer Requirements
2016The N balance allows the calculation of the fertilizer requirement which depends on the amount of N absorbed by the crop, the amount of inorganic N in the soil or produced by mineralization and N losses of the system, which are quantified by the Recovery Efficiency. A fertilization plan should take into account the variability of environmental factors,
Miguel Quemada +3 more
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Environmental friendly nitrogen fertilization
Science in China Series C Life Sciences, 2005With the huge intensification of agriculture and the increasing awareness to human health and natural resources sustainability, there was a shift towards the development of environmental friendly N application approaches that support sustainable use of land and sustain food production.
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Nitrogen Fertilization I: The Nitrogen Balance
2016Nitrogen is the most important nutrient in agricultural production. The natural input of N is due to N fixation, especially by Rhizobium bacteria that infect the roots of legumes. Organic N becomes inorganic through mineralization, and then inorganic N is absorbed by plants.
Miguel Quemada +3 more
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Fertilizer Nitrogen Management
1989ABSTRACT Nitrogen fertilizer supply is the primary nutrient limitation for both total world food supply and protein content. Unfortunately N fertilizer can also be a major contributor of N to ground water supplies if managed improperly. “Proper use” of N fertilizer involves accurate assessment of need before application.
G.A. PETERSON, W.W. FRYE
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The Impact of Nitrogen Fertilization
1980A main source of anthropogenic nitrous oxide in the future will be the increasing use of industrially produced nitrogen fertilizers. Biological processes in the soil convert fixed nitrogen to N2O which is emitted to the atmosphere. Large uncertainties are connected with these production processes, and reliable estimates of their efficiencies are ...
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