No-till seeded winter wheat: influence of date of nitrogen application on the seasonal pattern of crop growth and water use
| dc.contributor.author | Johnston, A.M. | |
| dc.contributor.author | Fowler, D.B. | |
| dc.date.accessioned | 2018-09-15T15:36:11Z | |
| dc.date.available | 2018-09-15T15:36:11Z | |
| dc.date.issued | 1991-02-21 | |
| dc.description.abstract | An 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.version | Non-Peer Reviewed | |
| dc.identifier.uri | http://hdl.handle.net/10388/10597 | |
| dc.language.iso | en | en_US |
| dc.relation.ispartof | Soils and Crops Workshop | |
| dc.rights | Attribution-NonCommercial-NoDerivs 2.5 Canada | * |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ | * |
| dc.title | No-till seeded winter wheat: influence of date of nitrogen application on the seasonal pattern of crop growth and water use | en_US |
| dc.type | Presentation | en_US |
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