UNIT 4: Answers

Practice #1 Answers
Determine if a pH reading is acid, neutral or alkali.
1.  6.0    acid
2.  7.5    alkali
3.  3.0    very acid
4.  13.0  very alkali

5.  6.5

6.  Yes, treat soil when it is 6.0 or below.

Practice #2 Answers
1.  pH readings away from neutral prevent nutrient reactions.
2.  BER is a calcium deficiency. 

Assessment Answers
For questions # 1-3, for standardized pH ranges,
1.  A pH level of 5 is:
     c. Acidic

2.  A pH level of 9 is:
     a. Alkali

3.  A pH level of 7 is:
     b. Neutral

4. For tomato soil, a pH level of 6.5 is:
     a.  pH balanced

True  5.  Alkaline soil prevents plant calcium uptake.

True  6.  Acidic soil prevents plant calcium uptake.

True  7.  Chemical pH testing may be completed with a home kit, or tested professionally.

False 8.  Lime is used to neutralize (lower the pH of) alkali soil. (Sulfur lowers pH)

False 9.  Sulfur is used to neutralize (raise the pH of) acidic soil. (Lime raises pH)

10.  Jack's soil is acidic.  He should add:
       a.  2 cups of lime per tomato plant

Return to Unit 4

Revised December 3, 2001
Copyright Anne Premont