Abstract
Adoption of no‐till seeding practices by many farmers has increased interest in using anhydrous ammonia (AA) in single‐pass seeding operations. It is expected that crop response to different fertilizer N sources and fertilizer placement will vary at the landscape level, because of inherent differences in soils related to topography. Two openers (side‐band and sweep wing tip) were evaluated for use in a single‐pass seeding operation of spring wheat (Triticum aestivum L.). The openers differed in fertilizer placement and soil disturbance. The effect of AA on grain yield and protein content as influenced by application rate and opener was investigated at varied landscape positions. The experiment was conducted at six sites in two years using a randomized complete block design. Averaged across year and location, wheat grain yield was higher on footslopes than on shoulders; however, the effect of landscape position was not consistent at all locations. Landscape position did not affect protein content. Application of AA with either opener resulted in grain yields and protein contents comparable to granular urea and ammonium nitrate (AN) fertilizers. Even at the highest AA application rate tested (105 kg N ha−1), no crop damage was expressed in final yield.
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