Abstract
Changes in the soil phosphorus and potassium status on three farming systems in the Northeast Polder during 25 years are related to the fertilizer regime over this period.
The changes in the nutrient status of the soil are reflected in fertilizer policy. High rates of phosphate dressings markedly increased the phosphate status of the soil and built up a reserve of phosphate. In contrast, the potassium status decreased by about half, because only potatoes in the rotation were dressed with potassium.
Methods of fertilization are discussed and suggestions are made with regard to possible improvements.
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The results of this investigation have also been reported in Dutch as a note of the Institute (Nota 59, 1978).
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Prummel, J. Fertilizer regime and changes in the phosphate and potash status of a silty marine clay soil during 25 years. Fertilizer Research 1, 95–101 (1980). https://doi.org/10.1007/BF01073181
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DOI: https://doi.org/10.1007/BF01073181