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- W2076438352 abstract "Abstract The fate of N fertilizer applied annually for 5 or 6 years at rates up to 200 kg N ha −1 year −1 was determined on eight perennial grassland sites in western North Dakota. The amount of fertilizer N found in plant tops, roots, and as residual soil inorganic N, and the sum of these three fractions were determined for each site. The amount of fertilizer N recovered in each of these fractions was linearly correlated with the amount of fertilizer N applied to each site in almost all instances. Fertilizer N recovered in top growth was highest for smooth bromegrass ( Bromus inermis ) (about 80% of that applied), and least for the native prairie grasses (about 15% of applied), with intermediate values for crested wheatgrass ( Agropyron desertorum ). Likewise fertilizer N recovered in roots was greatest for bromegrass (near 15%), whereas soil inorganic N content was usually greatest under native range. Total fertilizer N recovered in these three fractions was usually near 50% for bromegrass sites, but only about 30% for native range sites. There was no evidence of appreciable runoff or deep percolation of nitrates. Fertilizer N not recovered was either immobilized in other forms of soil organic matter or lost to the atmosphere in gaseous forms. Available evidence indicates that only small quantities of fertilizer N would be expected to be immobilized in organic forms other than in plant roots, thereby suggesting that gaseous loss of applied N may have been significant at these dryland perennial grass sites." @default.
- W2076438352 created "2016-06-24" @default.
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- W2076438352 date "1980-05-01" @default.
- W2076438352 modified "2023-10-02" @default.
- W2076438352 title "Response of Semiarid Grassland Sites to Nitrogen Fertilization: II. Fertilizer Recovery" @default.
- W2076438352 doi "https://doi.org/10.2136/sssaj1980.03615995004400030023x" @default.
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