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| Web URL(s): | http://www.tandfonline.com/doi/pdf/10.1080/01904169709365264
Last checked: 10/13/2015
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Report |
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| Author(s): | Griffith, Stephen M.;
Alderman, Stephen C.;
Streeter, Donald J. |
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| Author Affiliation: | National Forage Seed Production Research Center, USDA, ARS, Corvallis, OR |
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| Title: | Italian ryegrass and nitrogen source fertilization in western Oregon in two contrasting climatic years: II. Plant nitrogen accumulation and soil nitrogen status |
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| Article Series: | Italian ryegrass and nitrogen source fertilization in
western Oregon in two constrasting climatic years. Part 1 |
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| Source: | Journal of Plant Nutrition. Vol. 20, No. 4/5, 1997, p. 429-439. |
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| Publishing Information: | New York: Marcel Dekker, Inc. |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Lolium multiflorum; Nitrogen fertilization; Nitrogen; Climatic factors; Nutrient availability; Soil fertility; Growth; Calcium nitrate; Ammonium nitrate; Ammonium sulfate; Ammonium chloride; Urea dicyandiamide; Comparisons; Fertilizer types; Nitrogen uptake; Seed yield; Biomass; Dry weight; Tillers (vegetative); Shoots; Roots; Growing degree days; Nutrient status improvement; Soil pH
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| Cultivar Names: | Marshall |
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| Geographic Terms: | Western Oregon |
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| Abstract/Contents: | "To develop optimum nitrogen (N) fertilization practices with the least impact on environmental quality and with the greatest economic return, it is imperative that a greater understanding of crop and soil N dynamics be sought. This paper reports on research conducted with these objectives: (i) to determine the relationship between plant N and dry matter accumulation and soil N status as affected by N-source fertilization as a function of accumulated growing degree days (GDD), and (ii) to determine if western Oregon soil conditions favor ammonium (NH₄) over nitrate (NO₃) nutrition during the conditions favor ammonium (NH₄) over nitrate(NO₃) nutrition during the period of grass seed crop growth. In a companion paper, plant growth and seed yield component data were discussed in relation to N-source treatments and climatic year effects. Western Oregon field plots of Italian ryegrass (Lolium multiflorum Lam.) were fertilized with calcium nitrate, ammonium nitrate, ammonium sulfate, ammonium chloride, and urea-dicyandiamide (DCD) to manipulate soil NH₄ and NO₃ ratios. Italian ryegrass accumulated the greatest portion of plant N and dry mass between tiller elongation and mid-heading. Reduced growth and seed yield in 1991, compared to 1992, were associated with lodging and low soil pH. Higher soil NH₄ levels in 1991 were most likely responsible for a greater reduction in soil pH for that year. Declines in soil pH due to elevated NH₄ levels during climate years normal to western Oregon, wet and cool, may have an additive effect to other factors limiting seed yield. When cool wet soil conditions exist NH₄ was the predominate mineral N-form. Information reported here and in the companion paper is valuable to farm manager and consultants in the context of N fertilization of ryegrass grown for seed in western Oregon. It begins to establish criteria for the future development of site specific nutrient management plans and adds knowledge that will aid in improving N-use efficiency through improving N fertilizer timing and N source use" |
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| Language: | English |
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| References: | 13 |
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| Note: | Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Griffith, S. M., S. C. Alderman, and D. J. Streeter. 1997. Italian ryegrass and nitrogen source fertilization in western Oregon in two contrasting climatic years: II. Plant nitrogen accumulation and soil nitrogen status. J. Plant Nutr. 20(4/5):p. 429-439. |
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| Web URL(s):
http://www.tandfonline.com/doi/pdf/10.1080/01904169709365264
Last checked: 10/13/2015
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: QK 867 .J67 |
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