Stats: Soil and Water Management

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This quiz has been taken 6 times
The average score is 39 of 50

Answer Stats

Question	Answer	% Correct
Irrigation is needed when the soil moisture deficit equals 6 inches. How long will it be before irrigation is needed if the average daily ET is 0.5 inches and one 1 inch rainfall event occurs with no runoff? Initial soil moisture deficit is 2 inches .	10	100%
If a field has an 11 foot change in elevation over a distance of 1000 feet, the slope is _____%.	1.1	100%
The bulk density of 100 cm³ of dry soil that weighs 145 g is ____ g/cm³.	1.45	100%
The area of a rectangular field that is 1250 feet long and 700 feet wide is ___ acres.	20	100%
A day when there is _____ probability of precipitation would be best for pesticide application to minimize pesticide losses in runoff.	20%	100%
Which of the following NO3- concentrations would be considered hazardous to an infant?	44 mg/L	100%
Knowing the drainage class of soil is helpful when building a __ _	All of the above	100%
Which of the following is negatively charged?	Anion	100%
Subsurface compaction from tillage usually starts ____.	At the depth of tillage	100%
____ are raised soil areas used to improve drainage.	Beds	100%
Phosphorus transport from a field can be reduced by ____.	Buffer strip	100%
Tile drain spacing is smallest for a ____ soil.	Clay loam	100%
The irrigation method where water is applied at low volume is _____.	Drip	100%
When crop residues are removed from a field, soil _____ increases.	Erosion	100%
Nutrient enrichment of a surface water is termed______.	Eutrophication	100%
Maximum plant available water is _____ minus ____.	Field capacity, permanent wilting point	100%
Which kind of soil structure would be typical for a good seed bed?	Granular	100%
Poorly drained soils that are wet most of the year are often __ _	Grey	100%
Which of the following are most sensitive to saline water?	Humans	100%
The stable form of soil organic matter is called ______.	Humus	100%
Which of the following can decrease bulk density?	Incorporating Compost	100%
Which of the following is not an example of a contribution of soil organic matter to soil properties?	Increased molybdenum availability	100%
Soil microorganisms cause ______ in soil structure when crop residues are added to soil.	Increases	100%
Any factor that ____ runoff and ____ surface protection, increases erosion.	increases, decreases	100%
______ decreases odor and NH3 losses from biosolids.	Injection	100%
Which of the below is an example of sub-surface drainage?	Interceptor Drain	100%
Water moving horizontally in a soil is called _____ flow.	Lateral	100%
Which of the following pollutants is in water is not generally attributed to agriculture?	Mercury	100%
Cations are held on the CEC by ____ charges on clay and organic matter.	Negative	100%
Soil organic matter is a source of ____ for crops.	Nitrogen	100%
What is the most important soil property that affects soil health?	Organic matter	100%
In most situations, surface soil _____ will be lower after water erosion occurs.	Organic matter content	100%
Rapid water movement downward in large pores after a rain is called _____.	Preferential flow	100%
Which of the following is most important in carbon sequestration?	Reducing tillage	100%
Maintaining surface residues on a soil will ____ surface soil warming in the Spring.	Retard	100%
Good structure in the subsoil improves _____.	Root elongation	100%
Phosphorus is transported by _____ from fields.	Runoff	100%
Which kind of erosion removes a thin layer of soil?	Sheet	100%
What is the textural class of soil that is 10 percent clay and 35 percent sand?	Silt Loam	100%
The amount of soil that can be lost by erosion, while crop production is maintained economically for the long term is _____.	Soil loss tolerance	100%
_____ irrigation allows the most control to prevent runoff.	Sprinkler	100%
Which of the following increases as a soil's clay content increases?	Surface area	100%
Seedling emergence is hindered by _____.	Surface crusting	100%
Which of the following has the greatest impact on infiltration?	Surface residue	100%
Which of the following has the greatest impact on infiltration?	Surface soil texture	100%
Which of the following would be an acceptable conservation practice for a steep slope?	Terracing	100%
The maximum value for plant available water is _________.	The difference between field capacity and wilting point	100%
In order to increase soil organic matter levels, ______ must be markedly reduced or eliminated.	Tillage	100%
What standards are used to determine if a water body is impaired?	Total maximum daily load	100%
Maximum ET generally occurs ______.	When atmospheric demand peaks	100%
Ten ppm of NO3- (mw is 62) is ____.	All of the above	67%
Limited soil moisture generally _____ nutrient uptake.	Decreases	67%
Sediments in runoff decrease ____ in surface waters.	Light penetration	67%
Which of the following clays contributes most to CEC if the same amount of each clay is present?	Montmorillonite	67%
If a soil has an EC of 0.6 siemens per meter and contains 20 percent sodium on the CEC, it is a ____ soil.	Saline-Sodic	67%
Which of the following irrigation systems is least labor intensive?	Sprinkler	67%
A horizon that contains illuviated clay is the _____ horizon	B	50%
Soil erosion potential is highest in which of the following?	Clean-till	50%
In a typical row crop production system, most of the soil organic matter originates from _______.	Crop Residues	50%
Excessive soil moisture generally ____ nutrient uptake.	Decreases	50%
Potassium fixation occurs when which of the following clays is present in soil?	Illite	50%
Which of the following textural classes has the largest potential available water?	Silt Loam	50%
Which of the following factors does not affect wind erosion?	Slope length	50%
A _____ is specifically designed to improve ground water quality before ground water can move to a stream.	Tree planting	50%
Which of the following is a kind of wind erosion that forms dust storms?	Suspension	33%
How many acres in the S½ of the S½ of Section 29?	160	0%
If a septic system is being planned for a housing subdivision, a __ order soil survey is needed.	1st	0%
What is the percent crop residue cover if the average number ofresidue intersections is 20 at 6 inch increments over 50 feet?	20	0%
Well water contamination from surface water can be prevented by using a ____.	Casing	0%
Which of the soil textures listed below has the highest porosity and lowest bulk density?	Clay	0%
Which of the following soil textures has the greatest % porosity?	Clay	0%
When organic materials decompose, most of the C ends up as ____.	CO₂	0%
Which of the following organic materials would be expected to mineralize the most nitrogen?	Dairy manure	0%
Leaching is most impacted by _____.	Depth to restrictive layers	0%
Which of the following must exist for ET to occur?	High temperature	0%
Which of the following favors increased soil microbial activity?	Increase in soil water content from 20 to 40 percent of water holding capacity	0%
Maintaining crop residues on the surface and _____ reduce surface compaction.	Light tillage	0%
Soil _____ has little effect on sulfate movement.	pH	0%
Which of the following increases soil water storage?	Precipitation	0%
Soil structure modifies the physical properties of soil _____.	Texture	0%

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Soil and Water Management - Statistics