SCSC 301 Study guides, Class notes & Summaries

SCSC 301 Exam 1 (Graded A Plus) with Questions and Answers After a growing season of heavy tillage traffic across a soil, a soil property that is affected is: ANSWER bulk density From a biological point of view, the most important role of structural development in fine textured soils is to provide an increase in: ANSWER macro porosity The purity of light reflected by a soil is called: ANSWER chroma A word used to describe the consistence of soil is: ANSWER firm In a soil, having a...

SCSC 301 Unit 2 - Practice Questions and Verified Answers The porosity of the soil with a bulk density of 1.7 g/cm^3 and a particle density of 2.5 g/cm^3 is _____ % a. 17 b. 20 c. 25 d. 32 e. 68 ANSWER d. 32 A soil sample occupies 30 cm3 and weighs 50 g when wet. When dry, the soil occupies 20 cm3 and weighs 42 g. What is the gravimetric water content of this soil sample? a. 0.16 b. 0.19 c. 0.24 d. 0.50 e. none of the above ANSWER b. 0.19 What is the mass of 1 ha of soil t...

SCSC 301 Exam 3 Tamu with Latest Questions and Answers Which of the following is NOT a carbon-containing compound that is involved in the cycling of carbon associated with most plant/animal life forms? ANSWER calcium carbonate Which organic matter property affects the availability of nutrients to plants? ANSWER Cation exchange capacity **Complete degradation of residues (complete oxidation) results in _______ ANSWER CO2 Which of the answers below represents an immobilized form of N? ...

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...

SCSC 301 Exam 3 with Latest Questions and Answers Soil Colloid ANSWER organic and inorganic matter with very small particle size and a correspondingly large surface area per unit of mass; observe with electron microscope; adsorb cations and water and have surface charge Surface Charge ANSWER most soils negatively charged; net charge Crystalline Structure ANSWER atoms repeat themselves in a specific order Tetrahedra ANSWER linked together in a sheet, all tetrahedra in the sheet point ...

SCSC 301 Exam with Practice Questions and Answers A soil has a bulk density of 1.3 g/cm3, a particle density of 2.6 g/cm3, a total porosity of .5, and a gravimetric water content of .2. calculate the water-filled porosity. a) .2 b) .24 c) .26 d) .5 e) 1.30 ANSWER c After a growing season of heavy tillage traffic across a soil, a property that is affected is: a) texture b) bulk density c) particle density d) consistence e) color ANSWER B From a biological point of view, the...

SCSC 301 Exam with Updated Questions and Answers Which horizon is not part of the soil solum? ANSWER C Organic matter in soil typically accounts for ____% or less of the soils total volume. ANSWER 5% Pore space in soil may contain either _____ or _____ ANSWER Air Water Soils are the result of ______ and biota acting on parent material over time as modified by ______ ANSWER Climate Topography Though plants depend on soil for growth, which of the items below is found in soil, but ...

SCSC 301- Exam 4 with Questions and Answers Given values of soil pH, salt concentration, and % exchangeable sodium, distinguish among nonsaline, nonsodic, saline, saline-soidic, and sodic soils, and describe possible means of reclaiming such soils for crop growth. ANSWER Nonsaline - greater than 8.5 and as high as 9 or above because of sodium being on the exchange site, they hydrolyze into sodium carbonate and sodium bicarbonate in the soil solution. Saline soil vs. non-saline soil - elect...

SCSC 301 TAMU Test 1 with Questions and Answers Principle Components of Soil ANSWER -Air 25% -Water 25% ^ (healthy soil composition, those two vary from 50-0% to 0-50%) -minerals ~45% -Organics ~5% (again healthy soil it varies) % are by volume not mass Soil ANSWER Dynamic natural body having properties due to the combined effects of climate and biota as modified by relief acting on parent material over time. 5 thing that affect soil ANSWER Active: -climate -biota Passive: -p...

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...