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No-till seeded winter wheat: influence of date of nitrogen application on the seasonal pattern of crop growth and water use

dc.contributor.authorJohnston, A.M.
dc.contributor.authorFowler, D.B.
dc.description.abstractAn experiment was carried out to determine the influence of fertilizer N timing on the early season crop development and water use (ET) of no-till seeded winter wheat (Triticum aestivum L.). Ammonium nitrate N was surface broadcast either as early as possible (early), split between 2/3 early and 1/3 at the beginning of stem elongation (split), and 3 weeks after early (late), at rates of 0, 67, 134, and 202 kg N ha-1. Early and split-N application increased the early season plant development over Iate-N as recorded by tiller number and leaf area production. The development and maintenance of a larger leaf area with N fertilization in 1987 resulted in increased grain yields. However, high evaporative demand prior to anthesis in 1988 resulted in the 'collapse' of early season leaf and tiller responses. A positive correlation (r=0.82*) was recorded between leaf stomatal conductance (gl) and leaf relative water content, illustrating the importance of tissue water content in maintaining high photosynthetic activity. While added N increased pre-anthesis gl over the unfertilized check, the opposite response was recorded during the post-anthesis grain filling period. Increasing fertilizer N rate increased seasonal ET at 2 of the 8 trials by increasing post-anthesis ET over the unfertilized check. High pre-anthesis evaporative demand reduced season long ET to 159 mm in 1988, 59 % of the 218 mm recorded in 1987. Soil water contributed 16 % of total ET in 1987 and 30 % in 1988. The bulk of this soil water was taken up pre-anthesis, with 98 % of post-anthesis ET coming from rainfall.en_US
dc.description.versionNon-Peer Reviewed
dc.relation.ispartofSoils and Crops Workshop
dc.rightsAttribution-NonCommercial-NoDerivs 2.5 Canada*
dc.titleNo-till seeded winter wheat: influence of date of nitrogen application on the seasonal pattern of crop growth and water useen_US


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