Results 341 to 350 of about 1,606,732 (407)

Fertilizer nitrogen isotope signatures

Isotopes in Environmental and Health Studies, 2007
There 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, 1996
Abstract 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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Influence of nitrogen fertilization on broccoli yield, nitrogen accumulation and apparent fertilizer-nitrogen recovery

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, P. A. Bowen, P. M. A. Toivonen   +2 more
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Response of soil characteristics and bacterial communities to nitrogen fertilization gradients in a coastal salt‐affected agroecosystem

Land Degradation and Development, 2020
Understanding the relationship between fertilization and soil bacterial communities in a salt‐affected environment is essential for alleviating the adverse impact of excessive salinity on soil biochemical functioning.
R. Yao, Jinsong Yang, Xiang-Ping Wang, W. Xie, Fu-le Zheng, Hongqiang Li, Cong Tang, Hai Zhu   +7 more
semanticscholar   +1 more source

Nitrogen Fertilizers: Meeting Contemporary Challenges

AMBIO: A Journal of the Human Environment, 2002
At 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, 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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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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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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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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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
openaire   +3 more sources