Relation between soil mineral nitrogen before sowing and optimum nitrogen fertilization in onions

@inproceedings{Visser1995RelationBS,
  title={Relation between soil mineral nitrogen before sowing and optimum nitrogen fertilization in onions},
  author={C.L.M. de Visser and Wim van den Berg and H. Niers},
  year={1995}
}
To study the relationship between the amount of soil mineral nitrogen before sowing of onions (Nmin) and the optimum amount of nitrogen fertilizer (Nopt), 36 multilevel fertilizer nitrogen trials were conducted in the Netherlands between 1978 and 1982. For 26 trials Nopt was within the studied range (0-200 kg N/ha) and could be estimated using a quadratic response function. A significant linear relationship between Nopt and Nmin before sowing was only found when Nmin in the layer 0-30 cm was… CONTINUE READING