Measuring soil quality -discusses and gives guidelines for sampling and site characterization. Soil respiration -measured using an aluminum cylinder that is 6 inches in diameter and 5 inches long. The cylinder is capped and accumulated carbon dioxide respired by soil organisms and plant roots is measured. Respiration provides a measure of biological activity, which is related to nutrient cycling and breakdown of pollutants in the soil. Infiltration -measured using the same cylinder as in the soil respiration test.
Infiltration is important to reducing runoff and storing water in the soil for plant growth.
Bulk density is related to root growth, biological activity, and movement of water and air in the soil. It relates to nutrient availability and plant growth. Soil nitrate levels are important for plant growth and water quality. Aggregate stability -determined by sieving soil in water and measuring the amount of aggregates greater than 0.25 mm in diameter that remain on the sieve. Aggregation is important in decreasing erosion, increasing water and air movement, and preserving organic matter in the soil.