Full TGIF Record # 22187
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DOI:10.4141/cjps91-148
Web URL(s):http://pubs.aic.ca/doi/pdfplus/10.4141/cjps91-148
    Last checked: 10/01/2015
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Publication Type:
i
Refereed
Author(s):Leyshon, A. J.
Author Affiliation:Research Station, Research Branch, Agriculture Canada, Swift Current, Saskatchewan, Canada
Title:Effect of rate of nitrogen fertilizer on the above- and below- ground biomass of irrigated bromegrass in southwest Saskatchewan
Source:Canadian Journal of Plant Science. Vol. 71, No. 4, October 1991, p. 1057-1067.
Publishing Information:Ottawa: Agricultural Institute of Canada
# of Pages:11
Keywords:TIC Keywords: Fertilization rates; Nitrogen fertilizers; Bromus inermis; Forage; Root weight; Root distribution; Dry weight
Abstract/Contents:"A 9-yr study was conducted on an alluvial clay load at Swift Current, Saskatchewan to determine the effect of annual application of urea-N (46-0-0) fertilizer on production, nutrient quality, N use efficiency, root mass, and root distribution of bromegrass (Bromus inermis Leyss.). Nitrogen was applied annually at the rates of 0, 50, 100, and 200 kg ha-1 N to an established stand of bromegrass. Plots were flood irrigated. Forage DM yields increased linearly with rate of N applied. In all years, the slope of the response was similar and averaged 24 kg DM kg-1 N. The average y-intercept value was 1794 kg DM ha-1. In years 1-4, the N concentration in the grass was depressed at low N rates but after 5 yr the N concentration increased at all N rates. Tissue NO3-N levels over 100 ppm occurred at the 200 kg N rate after 3 yr. Applications of N reduced plant P in all years; the extent depended on N rate. Uptake of N increased with increasing N rate as did the apparent N recovery. Nitrogen rate had no effect on root mass or distribution. Root mass totaled 31 888 kg DM ha-1 to 105-cm depth. Approximately 36% of the root mass was in the top 7.5 cm, 11.9% in the 7.5- to 15-cm depth and 16.9% in the 15- to 30-cm depth. Estimates of the soil space occupied by roots indicate that they would occupy a large proportion of the available pore volume. It was concluded that producers growing bromegrass under irrigation on medium- to heavy-textured soils in southern Saskatchewan can consistently expect considerable increases in hay yield of good quality with N fertilizer at rates up to 200 kg N ha-1. While forage production increased linearly in response to N fertilization, root accumulation remained at a constant level. Further studies are needed to establish maximum yields and economic rates of N application."
Language:English
References:39
Note:Tables
Graphs
Abstract also appears in French
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Leyshon, A. J. 1991. Effect of rate of nitrogen fertilizer on the above- and below- ground biomass of irrigated bromegrass in southwest Saskatchewan. Can. J. Plant Sci. 71(4):p. 1057-1067.
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DOI: 10.4141/cjps91-148
Web URL(s):
http://pubs.aic.ca/doi/pdfplus/10.4141/cjps91-148
    Last checked: 10/01/2015
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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