Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Cca > Cca > Flashcards

Cca Flashcards

1
Q

What is not an essential nutrient for plants

A

Na

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What plant nutrient is a cation in soils

A

Potassium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What plant nutrient is a macronutrient

A

S- sulfur

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which element regulates stomata’s openings in plants

A

K - potassium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What beneficial elemet os important in animal nutrition

A

Se- selenium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What plant nutrient form is most immobile in soil

A

Phosphate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What it uptake form of nitrogen

A

NO3-

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the uptake form of phosphorus

A

H2PO4-

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the chemical uptake form of potassium

A

K+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What nutrient is a micronutrient

A

Cu - copper

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Which plant growth stage would you expect the highest demand for soil nutrients

A

Mid vegetative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the available source of nutrients

A

Soil minerals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

If a nutrient is released to the soil during decomposition of an organic material, ____ has occurred

A

Mineralization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

When a plant nutrient is absorbed with water that is moving to and into the plant root, the nutrient uptake process is called ___.

A

Mass flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

A major way calcium is supplied to plants is by ____.

A

Cation exchange

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Which nutrient is more soluble in a flooded soil than in an upland soil

A

Manganese

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What soil texture would likely have the lowest soil fertility

A

Sand

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

In which case would you expect the greatest nitrogen mineralization

A

Soil amended with biosolid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Which of the following is not needed for rapid nitrification to occur

A

Nitrate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Conditions which favor volatile losses of nitrogen as ammonia include

A

High temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Denitrification is the conversion of ____ to gaseous forms like dinitrogen and oxides of nitrogen

A

Nitrate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Symbiotic nitrogen fixation is the process where atmospheric nitrogen is converted to ammonia in the root nodules of ___.

A

Legumes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Immobilization of inorganic N during decomposition will be most likely if the material decomposing has a C:N ratio of ____.

A

35

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

A condition which favors symbiotic nitrogen fixation is ____

A

Low soil nitrate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Cropping system that substantially increase or decrease soil PH from PH 6.5 can _____ P availability

A

Decrease

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Soil sampling in a non-uniform field should be by the ___ method.

A

Grid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

The depth of sampling no-till soils as compared to conventionally tilled soil is ____.

A

Shallower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Nutrient concentrations ____ change with depth.

A

Usually

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

At which of the following soils test levels would you expect the greatest crop response

A

Low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

How are soil surveys useful in a soil sampling plan? They _____.

A

Provide yield potentials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Which of the following concepts of fertilizer recommendations increases soil fertility level most slowly?

A

Crop sufficiency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

If a soil contains 40 lb P/acre, it contains ___ ppm P

A

20

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Fertilizer recommendations obtained from a plant tissue analysis are ____ used to make a foliar fertilizer recommendation during that crop year.

A

Sometimes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

____ plant parts should be sampled to obtain reliable tissue test results.

A

Specific

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Which is the best pretreatment for a tissue sample prior to submitting the sample

A

Partially air dry in a paper bag

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

_____ is the plant nutrient concentration below which crop growth rate declines significantly

A

Critical value

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

The chlorophyll meter determines ____ sufficiency in a crop

A

N

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

Which of the following would not usually be a good source of N

A

Irrigation water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

The rate of N release is least affected by microbial activity for

A

Sulfur coated urea (no wax)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

If substantial ammonia is lost after application of UAN, a ____ inhibitor might reduce loss

A

Urease

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

Which of the following nitrogen fertilizer sources has the least % nitrogen

A

Ammonium sulfate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

Which of the following P sources is a liquid

A

Ammonium polyphosphate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

What is the most common form of potassium fertilizer

A

KCl

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

If a fertilizer is 13-13-13 on an oxide basis, what is the analysis on an elemental basis

A

13-5.7-10.8

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

The portion of a fertilizer that easily dissolves in water is

A

Water soluble

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

How many lbs of 10-20-10 should be applied to an acre of the fertilizer recommendation is 60 lbs of P2O5

A

300

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

How many lbs of 10-20-10 should be applied to an acre if the fertilizer recommendation is 26 lbs of P

A

300

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

If a manure contains 1.9% P on a dry basis and is 60% solids, what is the as is P concentration

A

1.1%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

Which of the following is the best way to maximize plant available N in manure

A

Incorporation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

When sampling a manure pile for analysis, how many samples is enough

A

Enough to assess manure availability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

Potassium can be leached into subsoil if long-term additions of ____ are applied to a soil

A

Lime

52
Q

Split applications of nitrogen fertilizer ____ as compared to a single application of the same amount of nitrogen

A

Reduce leaching losses

53
Q

_____ application of P usually results in the most available P

A

Banded

54
Q

Which of the following nutrient placement methods is common for small grains and forages

A

Top-dress

55
Q

Which of the following times of nutrient application is likely to use the least tractor time

A

At planting/ emergence

56
Q

Which of the following factors crates a situation where seed germination is likely reduced

A

Place a fertilizer with a high salt index near the seed

57
Q

As soil PH decreases, _____ increases

A

Hydrogen ion concentration

58
Q

Which of the following is the best measure of total acidity in a soil

A

Buffer pH

59
Q

Which of the following fertilizers has the greatest potential to decrease soil pH

A

Ammonium nitrate

60
Q

Which of the following soils would have the highest line requirements to meet a target of 6.5

A

PH 5, 25% clay, 2% organic matter

61
Q

At which of the following soils pHs would phosphorus be most available for plant uptake

A

6.8

62
Q

Which of the following micronutrients is more available at pH 7 than at pH 5

A

Mo

63
Q

Which of the following actually neutralizes soil acidity when lime is applied

A

CO3-

64
Q

Which of the following is not used in determining a lime recommendation

A

Exchangeable sodium percentage

65
Q

Lime passing through which of the following mesh sizes would be greatest benefit in neutralizing soil acidity?

A

60

66
Q

ECCE is the product of Effectiveness and

A

Calcium carbonate equivalence

67
Q

If the ECCE of a liming material is 65 and the line recommendation for a state is based on a material with an ECCE of 80, how should lime rate be adjusted for the material with an ECCE of 65

A

1.2 times recommendation

68
Q

Which of the following is least likely to change soil PH

A

Gypsum

69
Q

Which of the following is characteristic of a N deficiency

A

Leaves yellowed at the bottom of the plant first

70
Q

Soil testing and plant tissue test are usually

A

Used to test for nutrient deficiencies

71
Q

Which of the following best describes adaptive nutrient management

A

Adjust nutrient applications to optimize yields and profits

72
Q

Production history or level of management is a good way to determine

A

Yield goals

73
Q

Which of the following is not part of the 4R system

A

Sink

74
Q

Which of the following is commonly used to P loss assessments at the field scale

A

P Index

75
Q

Which of the following N losses is probably most important for a field of soybeans

A

Crop harvest

76
Q

Which of the following conditions allow N-based manure applications

A

Low P index

77
Q

If a manure contains 0.2% total P and 50% of the P contributed to soil test P, how much would soil test P increase if 5 ton/acre of the manure is applied to a soil

A

10 lb/acre

78
Q

Sinkholes in a Karat topography area can serve as conduits for N and P movement to

A

Streams, groundwater, reservoirs

79
Q

Which of the following is not part of the purpose of a nutrient management plan

A

Improve atmospheric conditions

80
Q

A comprehensive nutrient management plan should discuss

A

P movement to surface water

81
Q

The final step in a nutrient management plan is

A

Evaluation and adjustment

82
Q

Which of the following loss pathways is most concern for loss of nitrate N

A

Leaching

83
Q

Which of the following pathways is of most concern for loss of phosphate from recently tilled soil

A

Erosion

84
Q

Which of the following clays contributes most to CEC if the same amount of each clay is present

A

Montmorillonite

85
Q

If a soil has an EC of 0.6 Siemens per meter and contains 20 percent sodium of the CEC, it is a ___ soil

A

Saline-sodic

86
Q

What is the textural class of soil that is 10 percent clay and 35 percent sand

A

Silt loam

87
Q

Which of the following increases as a soils clay content increases

A

Surface area

88
Q

Which of the soil textures listed below has the highest porosity and lowest bulk density

A

Clay

89
Q

The maximum value for plant available water is

A

The difference between field capacity and wilting point

90
Q

Which of the following textural classes has the largest potential available water

A

Silt loam

91
Q

Which kind of soil structure would be typical for a good seed bed

A

Granular

92
Q

Soil structure modifies the physical properties of soil

A

Texture

93
Q

Good structure in the subsoil improves

A

Root elongation

94
Q

The bulk density of 100 cm3 of dry soil that weighs 145 g is ____ g/cm3

A

1.45

95
Q

Which of the following soil textures has the greatest % porosity

A

Clay

96
Q

Which of the following can decrease bulk density

A

Incorporating compost

97
Q

In a typical row crop production system, most of the oil organic matter originated from

A

Crop residues

98
Q

The stable form of soil organic matter is called

A

Humus

99
Q

Soil organic matter is a source of ____ for crops

A

Nitrogen

100
Q

In order to increase soil organic matter levels, ____ must be markedly reduced or eliminated

A

Tillage

101
Q

Which of the following is most important in carbon sequestration

A

Reducing tillage

102
Q

Which of the following favors increased soil microbial activity

A

Increase in soil water content from 20 to 40 percent of water holding capacity

103
Q

Which of the following organic materials would be expected to mineralize the most nitrogen

A

Dairy manure

104
Q

What is the most important soil property that affects soil health

A

Organic matter

105
Q

How many acres in the S1/2, of the S1/2 of section 29

A

160

106
Q

The area of a rectangular field is 1250 feet long and 700 feet wide is ___ acres

A

20

107
Q

If a field has an 11 foot change in elevation over a distance of 1000 feet, the slope is___ %

A

1.1

108
Q

Which kind of erosion removes a thin layer of soil

A

Sheet

109
Q

Which of the following is a kind of wind erosion that forms dust storms

A

Suspension

110
Q

Which of the following does not affect wind erosion

A

Slope length

111
Q

The amount of soil that can be lost by erosion, while crop production is maintained economically for the long-term is called

A

Soil loss tolerance

112
Q

In most situations, surface soil ____ will be lower after water erosion occurs

A

Organic matter content

113
Q

Which of the following would be an acceptable conversation practice for a steep slope

A

Terracing

114
Q

Soil erosion potential is highest in which of the following scenarios

A

Clean-till

115
Q

What is the percent crop residue cover if the average number of residue intersections is 20 at 6 inch increments over 50 feet

A

20

116
Q

When crop residues are removed from a field, soil _____ increases

A

Erosion

117
Q

Subsurface compaction from tillage usually starts ___

A

At the depth of tillage

118
Q

Seedling emergence is hindered by

A

Surface crusting

119
Q

Maintaining crop residues on the surface and ___ reduce surface compaction

A

Light tillage

120
Q

Which of the following increases soil water storage

A

Precipitation

121
Q

Which of the following has the greatest impact on infiltration

A

Surface soil textire

122
Q

Runoff decreases as ___ increases

A

Surface residue

123
Q

Phosphorus is transported by ___ from fields

A

Runoff

124
Q

Excessive soil moisture generally ___ nutrient uptake

A

Decreases

125
Q

The irrigation method where water is applied at low volume is

A

Drip

126
Q

___ are raised soil areas used to improve drainage

A

Beds

127
Q

Tile drain spacing is smallest for a ___ soil

A

Clay loam

Cca (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions