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Winter wheat: N-quantity and N-distribution are crucial for optimizing both yield and protein content

Year: 2025

Crop: winter wheat

Location: Wieselburg, Austria, medium-heavy soil with high silt content

Products: NAC 27 N


OBJECTIVES:

Influence of N-quantity and N-distribution on yield and protein content of winter wheat.


FERTILIZATION:

3 applications with NAC 27 N. P- and K-fertilization is done with single nutrient fertilizers based on removal. This long-term trial over a crop rotation winterwheat-maize-winter barley- sugar beet aims to identify climate-friendly fertilization strategies considering the influence of crop residues and cover crops. N-fertilization exceeds the legal limit on purpose for investigating the effects on humus content and N-losses. 


HARVEST RESULTS:

  • Increasing N-amounts result in yield increase up to a level of 200 kg N/ha
  • Additional N-quantities on top led to an increase of the protein content  
  • The N-fertilization pattern is key for N-efficiency (example 160 kg N/ha total N):
    • A moderate N-quantity of 40 kg N/ha at the first application brought higher yields and consequently higher protein contents compared to a first application with 80 kg N/ha. 
    • 40 kg N/ha at shooting did not reach the yield level compared to 80 kg N/ha at shooting 
    • Only the high N-amount of 80 kg N/ha at flag leaf stage increased the protein content remarkably – however at the expense of its yield caused by a too low N-amount at shooting. 


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