Plsoil quiz one -

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Unformatted text preview: PLSOILIN 105 & 106 Quiz One February, 2012 Record your answers on an optically scanned “bubblesheet” for grading. Also record your answers on this page, so you can figure out how many questions you got correct when the correct answers are posted. No quizzes will be returned. Answers will be linked to the course webpage. By definition, the maximum diameter of a silt particle is... 2 mm 1 mm 0.1 mm (= 100 pm) 0.05 mm (= 50 [.Lm) 0.002 mm (= 2 pm) In soil science terminology, topsoil is usually called “loam”. iii: flaunts aWW CW For soil structures such as small aggregates (spheroidal) or prisms to be able to form in soil, which size class of particles must be present in soil? Clay Sand Silt A topsoil with many spheroidal aggregates usually has bulk density than a structureless, sandy soil with very few aggregates. Higher WWW?) 01631154743 ”wet ’1‘ (‘me Macro/0M5 Because water molecules have a positive end and a negative end, water is called a polar molecule. True False 6. C? D. E. N 9° ®p0w® D. 10. Two or three days after a heavy rain, gravity has removed all the water from soil that it can, and the soil water content is said to be at... Saturation Field capacity The permanent wilting point The post-gravitational level The hygroscopic coefficient Which one of the soils below probably contains the most water at the permanent wilting point? Clay loam Loam Loamy sand Sandy loam Silt loam Increasing the amount of organic matter in a soil will increase the plant-available water it can store. True False During which season of the year, might a heavy, organic mulch cause soil temperatures to be less desirable for gardeners? Spring Summer Autumn q . Winter When will a soil have higher concen- trations of CO2 in its air-filled pores? Q) When the soil is at field capacity. B. When the soil is at the permanent wilting point. ...
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