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Soil Science Midterm

QuestionAnswer
The number of essential nutrients derived from the soil 14
pH 7.0, mineral soil. What's the net charge? negative
A clay tetrahedral layer has the _____ cation in its center. Si4+
A 2:1 Clay silicate layer has 1 octahedral layer
Cation exchange capacity is expressed as _____. milliequivalents per 100 grams of oven dried soil
The main source of pH dependent CEC is _____. soil organic matter
Vermiculite is a _____ clay 2:1
As BS decreases, soil pH... decreases
Ammonia volatilization most often occurs in high pH soils
potassium moves to plant roots via diffusion
ammonium moves to plant roots via diffusion
What elements are mycorrhizae most important for intaking? Nitrogen, phosphorus, copper, iron, zinc
What compounds increase soil pH CaCO3 Calcitic lime, CaMg(CO3)2 Dolomitic lime
A soil that has an EC < 4 mmhos/cm, pH < 8.5 and an SAR < 13 is____ (acidic, sodic, normal) normal
Ammonium sulfate acidifies soil via hydrolosis
Application of CaSO4 is used to increase floculation of sodic soils
Organisms that break down the toughest compounds in organic matter Fungi
microbes consume carbon and respire about ____ % of it as CO2 66
Created by: blakeypoo
 

 



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