1. Of the major macronutrients nitrogen (N), phosphorus (P), potassium (K) and sulphur (S), two of them do not move very far in the soil. Once applied, they disperse only very short distances. Which are they?

2. Canola often goes into wheat stubble. Average spring wheat yield on the Prairies in 2017 was 52.1 bu./ac. Roughly how much phosphate (in lb./ac.) would an average wheat crop remove from the soil?

3. Why is it important to place anhydrous ammonia fertilizer (NH3) into moisture? (Choose the most important reason.)