Details

Autor(en) / Beteiligte

• Tubana, B.S
• Arnall, D.B
• Holtz, S.L
• Solie, J.B
• Girma, K
• Raun, W.R

Titel

Effect of Treating Field Spatial Variability in Winter Wheat at Different Resolutions

Ist Teil von

• Journal of plant nutrition, 2008-10, Vol.31 (10-12), p.1975-1998

Ort / Verlag

Taylor & Francis Group

Erscheinungsjahr

2008

Quelle

Taylor & Francis

Beschreibungen/Notizen

• This study was conducted to determine the scale at which spatial variability should be treated using an in-season nitrogen fertilization optimization algorithm (NFOA). Treatments included variable nitrogen (N) rate applications at three resolutions (0.84, 13.4, and 26.8 m2), two treatments of 90 kg N ha-1 fixed rate applied preplant or midseason, and a check plot. Treatments were arranged in a completely randomized design with three replications established at two locations for three years. On average, the NFOA-based N rates achieved a higher N use efficiency (NUE) of 41% compared with only 33% of the 90 kg N ha-1 fixed rate applied midseason. The highest NUE among the NFOA-based N rate treatments was 56% at 13.4 m2 resolution. These benefits were attributed to a large reduction in NFOA-based N rate recommendations. Determining midseason N rate requirements using NFOA at 13.4 m2 resolution resulted in increased NUE and net return to N fertilizer.