Results 151 to 160 of about 950,917 (198)

Immobilization of fertilizer nitrogen and consequences for nitrogen fertilization of cereals

2001
From field trials with winter cereals it is known that about half of the applied fertiliser N (N) is not recovered in crops nor in soil mineral N (Nmin). In some experiments it has been shown that most of this non-recovered N was immobilized by soil microorganisms, which reduced fertiliser N availability for the crops. In field trials with winter wheat
K. Blankenau, H.-W. Olfs, H. Kuhlmann
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Uptake of fertilizer nitrogen and soil nitrogen by rice using15N-labelled nitrogen fertilizer

Plant and Soil, 1980
Data from five field experiments using labelled nitrogen fertilizer were used to determine the relative effects of soil nitrogen and fertilizer nitrogen on rice yield. Yield of grain was closely correlated with total aboveground nitrogen uptake (soil+fertilizer), less closely correlated with soil nitrogen uptake and not significantly correlated with ...
K. R. Reddy, W. H. Patrick
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Lignite-Based Nitrogenous Fertilizers

Energy Sources, 1983
A sample of lignite from Elbistan was oxidized by nitric acid in two stages, using relatively dilute acid in the first stage and concentrated acid in the second stage, and then the oxidized product was ammoniated so that a coal-based fertilizer could be produced. The experiments of all the stages were designed by a 1/2 X full factorial design.
DINCER, S, BARIS, H
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Nitrogen‐15 Variations in Fertilizer Nitrogen

Journal of Environmental Quality, 1974
AbstractNitrogen‐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, 2000
Summary. 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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Effect of nitrogen fertilizer residues on the response of irrigated bromegrass to fertilizer nitrogen

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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Nitrogen Fertilization II: Fertilizer Requirements

2016
The 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, Antonio Delgado, Luciano Mateos, Francisco J. Villalobos   +3 more
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Environmental friendly nitrogen fertilization

Science in China Series C Life Sciences, 2005
With 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

2016
Nitrogen 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, Antonio Delgado, Luciano Mateos, Francisco J. Villalobos   +3 more
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Nitrogen Fertilization of Ponds

Transactions of the American Fisheries Society, 1978
Abstract 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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