Scsc 301 exam 1 - Study guides, Class notes & Summaries

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SCSC 301 Tamu Exam 1 with Questions and Answers Chapter1 The Soils Around Us: Why is soil important? ANSWER 5 major functions: 1. medium for plant growth 2. support for buildings and roads (engineering medium) 3. habitat for organisms ication of waters and regulator of water supplies ling system for nutrients and organic wastes Medium for plant growth ANSWER -physical support -supply mineral nutrients -hold water (plants require a continuous stream of water to maintain photosynthes...

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SCSC 301 Exam 2 with Questions and Answers Soil Atmosphere ANSWER -Varies from atmosphere -Contains 2 main gases needed for the two most important biological processes -High CO2, lower O2 than atmosphere -vital for soils to exchange gases Photosynthesis - consumes CO2 and H2O and releases O2 and produces sugars Respiration - Consumes O2 and releases CO2, H2O, and energy -Microbes and plant roots need O2 and removal of CO2 C6H12O6 + 6O2 --> <-- 6CO2 + 6H2O Oxygen Availabi...

SCSC 301 - EXAM 3 with Questions and Answers Name the eight most abundant elements in soils; be able to order their percentage compositions in rock versus soils, surface versus subsoil, and coarse versus fine particles. ANSWER 1. Oxygen (O) 2. Silicon (Si) 3. Aluminum (Al) 4. Iron (Fe) 5. Calcium (Ca) 6. Sodium (Na) 7. Potassium (K) 8. Magnesium (Mg) -Ordered from increasing to decreasing in abundance -Oxygen, iron, calcium, potassium and magnesium are all essential for plant growt...

SCSC 301- SPRING 2024 Exam with Questions and Answers A soil having a pH of 8.0, 20% exchangeable sodium, and 5 dS conductivity is: ANSWER saline, sodic The most economical means of decreasing the soil pH from 7.0 to 4.5 in a non-calcareous soil is: ANSWER sulfur With the passage of time, the soil pH tends to: ANSWER decrease The compound that can be used as an agricultural liming material is: ANSWER CaCO3 Calcium Carbonate reacts with the carbonic acid in the soil solution to for...

Loess correct answer: Silt to very fine sand. Deposited by the wind. Volcanic ash correct answer: Soils of very low bulk density and high fixation of phosphorus. Glacial till correct answer: Poorly sorted. Glacial wash correct answer: Well sorted. Texture correct answer: The size distribution of inorganic (mineral) primary particles. Silt correct answer: .05-.002 mm in diameter USDA correct answer: Who is our final say on particle diameter of soils? Permeability corre...

SCSC 301 Exam 3 Questions With Correct Answers .12 ft deep peak of temp - ANSWER-About Oct. Nov. .9 steps in rock to soil development - ANSWER-1. physical disintegration 2. chemical alteration 3. changes in mineral distribution 4. formation of secondary minerals 5. appearance of higher plants 6. development of soil structure 7. leaching of bases 8. downward movement of clay 9. Fe/Al oxides are the remaining minerals .A horizons - ANSWER-topmost mineral horizon with some organic matter ...