Agronomy Soil Science and Fertility 2

Question 1

Soil organic matter improves soil structure primarily by doing what?

Accepted Answer

Promoting aggregate formation

Answer

Increasing bulk density

Answer

Raising soil pH

Answer

Reducing microbial activity

Question 2

Which micronutrient deficiency commonly appears as interveinal chlorosis on young leaves?

Accepted Answer

Iron

Answer

Manganese

Answer

Zinc

Answer

Boron

Question 3

What does the term 'base saturation' refer to in soil science?

Accepted Answer

Percentage of CEC occupied by base cations

Answer

Total amount of organic matter

Answer

Ratio of sand to clay

Answer

Depth of the A horizon

Question 4

Which soil order is commonly found in the Corn Belt and is highly productive for agriculture?

Accepted Answer

Mollisol

Answer

Oxisol

Answer

Aridisol

Answer

Spodosol

Question 5

Liming a soil primarily corrects which soil problem?

Accepted Answer

Excessive acidity

Answer

Low phosphorus levels

Answer

Poor drainage

Answer

High salinity

Question 6

What is the main form of nitrogen taken up by most crops from the soil?

Accepted Answer

Ammonium and nitrate

Answer

Urea

Answer

Organic nitrogen

Answer

Dinitrogen gas