Question

question 1 (1 point)
what is the risk of irrigation water with high ph (alkaline)?
o a lower plant survival
o b constant ph regardless of use
o c some nutrients may become unavailable to plants
o d improved nutrient availability

question 2 (1 point)
high salinity in irrigation water primarily harms plants by:
o a making it hard for them to absorb water and nutrients
o b causing them to grow faster
o c attracting more insects
o d turning them blue

question 3 (1 point)
which is a potential outcome of poor water quality for irrigation?
o a more rainfall
o b increased wildlife populations
o c lower crop yields
o d no effect on soil structure

Explanation:

• Question 1: High - pH (alkaline) irrigation water can cause chemical reactions in the soil that make certain nutrients (such as iron, manganese, and phosphorus) less soluble and thus unavailable for plant uptake.
• Question 2: High salinity in irrigation water creates an osmotic imbalance. The high salt concentration in the soil solution makes it difficult for plant roots to absorb water (as water tends to move from an area of lower salt concentration - inside the root cells - to an area of higher salt concentration - the soil solution) and also affects nutrient uptake.
• Question 3: Poor - quality irrigation water (whether due to high salinity, high pH, or contamination) can lead to reduced plant growth, nutrient deficiencies, or toxicity, all of which result in lower crop yields.

Answer:

• Question 1: C. Some nutrients may become unavailable to plants
• Question 2: A. Making it hard for them to absorb water and nutrients
• Question 3: C. Lower crop yields