Details

Autor(en) / Beteiligte

• Morris, K.B
• Martin, K.L
• Freeman, K.W
• Teal, R.K
• Girma, K
• Arnall, D.B
• Hodgen, P.J
• Mosali, J
• Raun, W.R
• Solie, J.B

Titel

Mid-season recovery from nitrogen stress in winter wheat

Ist Teil von

• Journal of plant nutrition, 2006-05, Vol.29 (4), p.727-745

Ort / Verlag

Philadelphia, NJ: Taylor & Francis Group

Erscheinungsjahr

2006

Quelle

Taylor & Francis

Beschreibungen/Notizen

• Although spring-applied nitrogen (N) has been shown to be most efficient, the technique of delaying all N applications until mid-season, and the resultant effect on maximum yields, has not been thoroughly evaluated. This experiment was conducted to determine if potential yield reductions from early-season N stress can be corrected using in-season N applications. Data from three experimental sites and two growing seasons (six site-year combinations) were used to evaluate three preplant N rates (0, 45, and 90 kg ha(-1)) and a range of in-season topdress N rates. Topdress N amounts were determined using a GreenSeeker hand-held sensor and an algorithm developed at Oklahoma State University. Even when early-season N stress was present (0-N preplant), N-applied topdress at Feekes 5 resulted in maximum or near-maximum yields in four of six site-year combinations when compared with other treatments receiving both preplant and topdress N.