Explanation may include
- high salt levels—low water uptake
- high metal levels—high stress, low yields
- excess phosphorus—discoloration
- excess nitrogen—yellowing and weakness.
Process/Skill Questions:
- How do excess levels of some necessary nutrients have a negative effect on crop yields?
- What types of corrective measures and/or management practices could one implement to eliminate or minimize the effects of water pollutants in irrigation water?
- Why is it important to determine whether soils have excessive nutrient levels before irrigating? Explain.