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If you continuously grow corn that removes 200 kg of N per hectare each year from the soil, you may have to supply 400 kg of N per hectare per year

  1. If you continuously grow corn that removes 200 kg of N per hectare each year from the soil, you may have to supply 400 kg of N per hectare per year as fertilizer. What happens to the extra N? Why are applied P and K likely to be recovered by the crop more efficiently than is applied N in the long run?  
  2. Why does Al3+ become a dominant exchangeable cation in acidic soils? Why is it not a dominant cation in neutral soils?  
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