Current N recommendation schemes are based on the Maximum Economic Yield (MEY), as obtained at "economic optimum' fertilizer application rates. Environmental standards for the amount of mineral N left in the soil at harvest time will soon restrict fertilizer rates to obtain an Environmentally Acceptable Production (EAP). For MEY, but especially for EAP, spatial variability of N supply in a field which is managed as if it were a homogeneous unit should be taken into account. Degree of spatial variability in N supply should be explicitly taken into account in future discussions of the conflict between environmental and production targets.
DOI:
https://doi.org/10.18174/njas.v40i1.16529Pontuação Altmetric:
Dimensões Contagem de citações:
Ano de publicação
1992
Autores
Idioma
English
Palavras-chave
crop yield, nitrogen fertilizers, prices, residues, minerals, simulation models
