Which of the following actions would best assure good aeration in a soil?
A) use a plastic mulch
B) remove excess water
C) increase the soil temperature
D) use cover crops, especially legumes
E) add organic residues
Question 2If you owned a dairy farm with poorly drained clay soils in a humid temperate region which of the following would be most satisfactory from the standpoint of soil aeration and temperature?
A) conventional moldboard plow system
B) no-till system
C) heavy chemical fertilization
D) heavy organic residues
E) ridge-till system
Question 3The partial pressure of oxygen in the atmosphere is 0.21 bar and that of nitrogen 0.78. Which of the following partial pressure levels would you expect to find in the pores of a moderately well-drained soil?
A) 0.15 (oxygen)
B) 0.21 (oxygen)
C) 0.50 (nitrogen)
D) 0.30 (oxygen)
E) 0.80 (nitrogen)
Question 4A well aerated soil is characterized by a relative abundance of ________.
A) methane gas B) micropores C) NO3- ions D) Fe2+ions E) NH4+ ions
Question 5Which of the following is not a major factor in determining the soil aeration status?
A) volume of macropores
B) nitrogen gas
C) redox potential
D) carbon dioxide
E) oxygen
Quick Reply
