IP guidelines must specify agronomically desirable and environmentally acceptable target ranges for soil fertility for at least P and K.

A nutrient allocation plan for P and K for each crop on a plot/field level must be established, taking into consideration:

  • The actual field status of soil fertility in relation to agronomically desirable and environmentally acceptable levels (P, K evt Mg).
  • The balance approach: Off-farm fertilizer input must only compensate the real exportation and unavoidable technical losses resulting:
    • for annual crops in an balance of inputs and exports at a rotational level (including the technical unavoidable losses),
    • for perennial crops in an annual balance of inputs and exports.
  • Additional inputs can be justified to maintain the desired soil fertility level, Inputs exceeding this plan are unacceptable: for instance small quantities of phosphate are sufficient to cause over-enrichment of surface waters. Phosphate from agricultural land is mostly translocated by erosion of small soil particles.
  • The distribution of macro nutrients over the years might be different to the export with crops, as long as the rotational balances are maintained.
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