WOFOST distinguishes three levels of crop production:
1. Potential production: determined by crop variety, crop management, radiation and temperature;
2. Water-limited production, where water availability limits the potential production.
3. Nutrient-limited production where nutrient availability limits the water-limited production
However, nutrient-limited production in WOFOST but is not implemented in a biophysical way (see section 2.1.2 of the WOFOST manual). Nutrient-limited production is obtained through post-processing of the water-limited production results. Further reducing factors (weeds, pests, frost and diseases) are not taken into account in WOFOST.
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