Day 7 notes

Day 7 notes - Notes 2/8/08 Day 7- Physical Measurements in...

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Notes 2/8/08 Day 7- Physical Measurements in Soils 1. Soil Consistence - describes the resistance of soil to mechanical stress (or manipulation) at various moisture contents. a. Dry Consistence i. Loose, soft, slightly hard, hard, very hard, extremely hard, ii. (remember loose, soft, hard) b. Moist consistence i. Loose, very friable, friable [{very delicate; a little pressure can destroy the ped}], firm ,very firm, extremely firm ii. (remember friable, firm) c. Wet consistence i. Plasticity -describes the moldability of the soil ; can be rolled into thin thread 1. non-plastic, slightly plastic, plastic, very plastic 2. (remember plastic) ii. Stickiness - described at the moisture content at which the soil adheres to fingers and thumb 1. Non-sticky, slightly sticky. Sticky, very stick 2. (remember sticky) iii. Both plasticity and stickiness are related to the amount and type of clay and Organic Matter content 1. Organic Matter decreases the plasticity and stickiness d. Brittle - moist peds resist pressure, but rupture abruptly. i.
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This note was uploaded on 03/26/2008 for the course AGRO 301 taught by Professor Dr.tomhallmark during the Spring '08 term at Texas A&M.

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Day 7 notes - Notes 2/8/08 Day 7- Physical Measurements in...

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