Unit 3

No description yet. This curated deck is ready for daily study.

Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

What number range does the pH scale follow?

Back (Answer)

0-14

Front (Question)

If something has a pH between 0-6, it is…

Back (Answer)

acidic

Front (Question)

if something has a pH between 8-14, it is…

Back (Answer)

basic

Front (Question)

if something has a pH of 7, it is…

Back (Answer)

neutral

Front (Question)

2 ways to determine soil pH:

Back (Answer)

pHw: water suspension test.. water measures H+ ions attached to soil pHs: lab field kit

Front (Question)

4 ways that pH governs productivity:

Back (Answer)

• Nutrient Availability • Strong acidic soils have low CEC occupied by K, Mg, &Ca • Affects pesticides • Affects microbial activity

Front (Question)

Factors causing pH to change? (9)

Back (Answer)

• Depletion of bases by erosion • Amount of rainfall/percolation • Absorption of bases by plants • chemical fertilizers • tillage • acid rain • waste & sewage sludge • irrigation • plant roots

Front (Question)

What is buffer capacity?

Back (Answer)

The resistance of the soil to changes in pH

Front (Question)

what is active acidity?

Back (Answer)

H ions in solution

#10

Front (Question)

What is reserve acidity?

Back (Answer)

Absorbed H+ & Al+

#11

Front (Question)

Reserve acidity depends on…

Back (Answer)

the higher the CEC, the greater the buffer capacity

#12

Front (Question)

Why correct soil pH? (acidic levels)(5)

Back (Answer)

• Elements can reach toxic levels (deadly) • Microbial activity and population will be low • Ca & Mg may be deficient • Lose more potassium • low pH can mobilize heavy metals (deadly)

#13

Front (Question)

POSSIBLE TEST QUESTION: If on a budget, what should you fix before adding nutrients?

Back (Answer)

#14

Front (Question)

Liming materials

Back (Answer)

Calcitic Limestone Dolomitic Limestone Burned Lime: Made by heating limestone Hydrated Lime: Burnt lime with water added Marl: freshwater deposit in swamp areas Ground seashells Lime-rich industrial waste wood ash

#15

Front (Question)

What is burned lime?

Back (Answer)

a liming material made by heating limestone

#16

Front (Question)

what is hydrated lime?

Back (Answer)

burnt lime with water added

#17

Front (Question)

what is marl?

Back (Answer)

freshwater deposit in swamp areas

#18

Front (Question)

Quantities of lime are determined by?:

Back (Answer)

Current pH Desired pH Buffer capacity chemical makeup and fineness of liming material used

#19

Front (Question)

5 factors influencing liming frequency?

Back (Answer)

• soil texture • rate of N fertilization • rate of crop removal • amount of lime applied • pH desired range

#20

Front (Question)

When is the best time to lime? (2)

Back (Answer)

• soil test for lime needed every 3 years 2. 3-6 mos. before planting legumes

#21

Front (Question)

What is ENM?

Back (Answer)

Effective Neutralizing Method

#22

Front (Question)

ENM tells us

Back (Answer)

how many tons per acre of material to apply

#23

Front (Question)

ENM on soil test says 850, quarry has calculated ENM to be 475…. how much per acre needs to be applied?

Back (Answer)

850/475=1.78 tons per acre

#24

Front (Question)

Alkaline soils have a pH above…

Back (Answer)