Scsc 301 - Study guides, Class notes & Summaries

A soil has a bulk density of 1.3 g/cm^3, a particle density of 2.6g/cm^3, a total porosity of .5 and a gravimetric water content of 0.2. Calculate the water-filled porosity. correct answer: .26 After a growing season of heavy tillage traffic across a soil, a soil property that is affected is: correct answer: bulk density From a biological point of view, the most important role of structural development in clayey textured soils is to provide an increase in: correct answer: macro porosity...

After a growing season of heavy tillage traffic across a soil, a soil property that is least affected is: correct answer: Particle density From a biological point of view, the most important role of structural development in clayey textured soils is to provide an increase in: correct answer: macro porosity The purity of light reflected by a soil is called: correct answer: chroma A word used to describe the consistence of a soil is: correct answer: plastic A soil horizon in which ...

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 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...

Soil water Energy - ANSWERdifferences in energy level of water from one site to another determines direction and rate of water movement in soils and plants. Wetter soil has water held at a higher energy, etc. Matric Potential - ANSWERmost limiting potential factor to plants, baseline is pure free water (assigned a value of 0), water has low energy and is bound with little freedom to move Saturated - ANSWERall soil pores are filled with water, matric potential is zero. Theoretical Satiat...

A soil with a pH of 8.0, 10% exchangeable sodium, and 5 dS/m conductivity is: -saline, non-sodic -non-saline, non-sodic -non-calcareous -saline, sodic -non-saline, sodic correct answer: saline, non-sodic The most economical means of decreasing the soil pH from 7.0 to 4.5 in a non-calcareous soil is by the addition of: -neutral salts -gypsum -ferrous sulfate -nitrogen fertilizer -agricultural limestone correct answer: ferrous sulfate With the passage of time, the soil pH t...

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 Final Test with Questions and Answers a typical moist surface soil contains approximately ANSWER 25% air 25% water 45% minerals 5% organic matter a common primary silicate mineral which weathers to form secondary silicate minerals in soils ANSWER agate a primary phosphorous mineral that is resistant to weathering ANSWER apatite one of the more soluble and therefore, easily weathered minerals in acid soils is ANSWER dolomite a property used in distinguishing among miner...

SCSC 301 - Exam 1 Questions With Complete Solutions

SCSC 301 Exam 1 with Questions and Answers Soils in Texas ANSWER There are 255 distinct soils in Texas Texas has a variety of types of soil 5 Major Soil Functions ANSWER 1. Medium for Plant Growth 2. Support for buildings and roads 3. Habitat for organisms 4. Purification of waters and regulator of water supplies 5. Recycling system for nutrients and organic wastes Medium for plants growth ANSWER Physical support Supply mineral support Holds water → plants require a continuous...