Results 351 to 360 of about 1,606,732 (407)

Fertilizer Nitrogen Management

1989
ABSTRACT 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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Global assessment of nitrogen fertilizer: The SCOPE/IGBP nitrogen fertilizer rapid assessment project

Science in China Series C Life Sciences, 2005
Nitrogen (N) availability is a key role in food and fiber production. Providing plant-available N through synthetic fertilizer in the 20th and early 21st century has been a major contributor to the increased production required to feed and clothe the growing human population. To continue to meet the global demands and to minimize environmental problems,
Arvin R, Mosier, J Keith, Syers, John R, Freney   +2 more
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Liquid nitrogenous fertilizers

The Journal of Agricultural Science, 1959
The results show that liquid fertilizers generally gave lower yields of dry matter than conventional solid fertilizers in four experiments on grassland. In seven trials, on autumn wheat, spring wheat, sugar beet and kale, the efficiencies of the two forms of fertilizer were similar.Liquid fertilizers containing ammonia must be injected into the soil ...
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Nitrogen fertilizers promote denitrification

Biology and Fertility of Soils, 1997
A laboratory study was conducted to compare the effects of different N fertilizers on emission of N2 and N2O during denitrification of NO3 – in waterlogged soil. Field-moist samples of Drummer silty clay loam soil (fine-silty, mixed, mesic Typic Haplaquoll) were incubated under aerobic conditions for 0, 2, 4, 7, 14, 21, or 42 days with or without ...
R. L. Mulvaney, S. A. Khan, C. S. Mulvaney   +2 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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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 potatoes

American Potato Journal, 1958
1. Yield increases under irrigated Long Island conditions were obtained with applications up to 210 pounds of nitrogen per acre with Cobbler and Katahdin varieties. 2. Nitrogen distribution had little effect on yield as long as vines were allowed to go to maturity. 3. When less than 70 pounds of the total nitrogen was applied
R. L. Sawyer, S. L. Dallyn
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Nitrogen Fertilization Increases Soil Microbial Biomass and Alters Microbial Composition Especially Under Low Soil Water Availability

Microbial Ecology, 2022
Wanting Li, L. Xie, Chunzhang Zhao, Xu-Dong Hu, C. Yin   +4 more
semanticscholar   +1 more source

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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Fate of fertilizer nitrogen.

Journal of Soil Science, 1985
SUMMARY Results are presented from a three year lysimeter investigation, employing single ( 15 NH 4 NO 3 ) and double ( 15 NH 4
D. BARRACLOUGH, E. L. GEENS, G. P. DAVIES, J. M. MAGGS   +3 more
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