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Effect of nitrogen fertilization and shading on morphogenesis, structure and leaf anatomy of Megathyrsus maximus genotypes. [PDF]
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Lignite-Based Nitrogenous Fertilizers
Energy Sources, 1983A 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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Fertilizer nitrogen isotope signatures
Isotopes in Environmental and Health Studies, 2007There has been considerable recent interest in the potential application of nitrogen isotope analysis in discriminating between organically and conventionally grown crops. A prerequisite of this approach is that there is a difference in the nitrogen isotope compositions of the fertilizers used in organic and conventional agriculture.
Bateman, Alison S., Kelly, Simon D.
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Nitrogen Fixation and Nitrogen Fertilization of Soybeans
Isotopes in Environmental and Health Studies, 1996Abstract In pot experiments with (15)N labelled soil and mineral (15)N, the influence of Bradyrhizobium (Rhizobium japonicum) inoculation and N fertilization on the symbiotic N(2) fixation and yield of soybeans [Glycine max (L.) Merill., cv. 'Fiskeby V'] was investigated.
W, Merbach, H J, Jacob
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Canadian Journal of Plant Science, 1995
An understanding the relationships between N-fertilization rate, crop-N recovery, residual inorganic N in soil and crop yield can assist in making N fertilizer recommendations which balance crop value and environmental risk. Nitrogen was applied to three plantings of broccoli at 0, 125, 250, 375, 500 and 625 kg N ha−1 as a broadcast application of ...
B. J. Zebarth +2 more
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An understanding the relationships between N-fertilization rate, crop-N recovery, residual inorganic N in soil and crop yield can assist in making N fertilizer recommendations which balance crop value and environmental risk. Nitrogen was applied to three plantings of broccoli at 0, 125, 250, 375, 500 and 625 kg N ha−1 as a broadcast application of ...
B. J. Zebarth +2 more
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Nitrogen Fertilizers: Meeting Contemporary Challenges
AMBIO: A Journal of the Human Environment, 2002At 81.7 million tonnes (Mt), commercial fertilizer nitrogen (N) accounts for approximately half of all N reaching global croplands today and supplies basic food needs for at least 40% of the population. The challenge is to continue to help meet that need while minimizing the risk of negative environmental impacts through improved N-use efficiency ...
Paul E, Fixen, Ford B, West
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Uptake of fertilizer nitrogen and soil nitrogen by rice using15N-labelled nitrogen fertilizer
Plant and Soil, 1980Data 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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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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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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