Chapter 14

Question 1

The incorporation of plant residues into soil increases their rate of decay.

Answer 1

True

Question 2

Moldboard plowing leaves adequate residue cover to protect the soil.

Answer 2

False

Question 3

Excessive plowing can lead to the loss of organic matter.

Answer 3

True

Question 4

Primary tillage smoothes the seedbed for planting.

Answer 4

False

Question 5

Conventional tillage requires less time and energy than conservation tillage.

Answer 5

False

Question 6

No-till is commonly used on wet soils in northern regions.

Answer 6

False

Question 7

A benefit to the ridge till system is earlier planting.

Answer 7

True

Question 8

Good soil-to-seed contact is important for planting success.

Answer 8

True

Question 9

Fall plowing can facilitate earlier planting.

Answer 9

True

Question 10

Oxygen is not a factor in seed germination.

Answer 10

False

Question 11

Light is a requirement for germination for most crop species.

Answer 11

False

Question 12

The mechanism of dormancy can result in germination being staggered over years.

Answer 12

True

Question 13

Seed of some cereal crops undergoes after-ripening before germination.

Answer 13

True

Question 14

The initiation of metabolic processes in the seed occurs after germination.

Answer 14

True

Question 15

At low seeding rates, plant populations are not utilizing resources optimally.

Answer 15

True

Question 16

Typical row spacing of corn and soybean have increased since the 1950’s.

Answer 16

False

Question 17

On approximately how much planted land is conventional tillage used in the United States?
A. 1/10
B. 1/4
C. 1/3
D. 1/2

Answer 17

C. 1/3

Question 18

Which piece of equipment shears off sections of soil and flips them over?
A. chisel plow
B. moldboard plow
C. cultivator
D. disk plow

Answer 18

B. moldboard plow

Question 19

How much residue does moldboard plowing typically leave?
A. 0 to 15 percent
B. 10 to 25 percent
C. 20 to 30 percent
D. greater than 30 percent

Answer 19

A. 0 to 15 percent

Question 20

Which of the following crops leaves the most residue after harvest?
A. wheat
B. soybean
C. corn
D. barley

Answer 20

C. corn