Which of the following is a way to maintain organic matter in the soil?
a. Leaving crop residues
b. Extensive use of herbicides
c. Planting the same crop each season
Question 2Which of the following is NOT a reason for why fine-textured soils have more organic matter?
a. Water and nutrient retention
b. Better supply of oxygen
c. Less nitrogen
d. Clay protects humus from further decay