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# REDIRECT Soil horizon
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# and Soil
# Soil surface: cover crops to retain soil and lessen erosion, along with green manures to add nutrients and organic matter to the soil, especially nitrogen
In the Unified Soil Classification System ( USCS ) and the AASHTO Soil Classification system, the sand-silt distinction is made at the 0. 075 mm particle size ( i. e., material passing the # 200 sieve ).
Despite Wagner's increasing prominence as one of several acclaimed self-publishers of the period — along with Jeff Smith ( Bone ), Colleen Doran ( A Distant Soil ), James Owen ( Starchild ), and Sim — the series stalled after issue # 12 in 1994.
According to the Unified Soil Classification System, a # 4 sieve ( 4 openings per inch ) having 4. 75mm opening size separates sand from gravel and a # 200 sieve with an 0. 075 mm opening separates sand from silt and clay.
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