Water Stable Aggregates (Cornell Sample Clauses

Water Stable Aggregates (Cornell. Scope and Application Soil aggregate stability is an indicator of soil health and is also influenced by the inherent particle size distribution. The formation of stable soil aggregates is often caused by increased soil organic matter content, resulting in improved infiltration and aeration of soils, and decreased soil erosion caused by wind or water. Unstable soil aggregates fall apart when hit by rain drops or irrigation water. The dispersed soil particles can block soil pores and form surface crusts, which reduce air exchange and water infiltration. The method described here is modified from the Cornell Soil Health Manual-Wet Aggregate Stability (Gugino et al., 2009), which simulates an impactful natural phenomenon: a heavy rainstorm when the surface soil is dry. Summary Soil is air dried at 30⁰C, soil that passes through a sieve with 2 mm openings are evenly spread on a sieve with 0.25mm openings. A rain simulator is placed 50cm above the sieve, and 1.25cm of rain is dropped by the simulator over a 5 minute period. The mass of sand sized particles is subtracted from the total mass of particles that remain on the screen. Water stable aggregates are the aggregates that remain in the sieve after test. Materials  2.0mm sieve  0.25mm sieve  Rain simulator  Balance  Stop watch  Oven Reagents  Deionized water Procedure
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