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WSET Diploma Unit 2 (OUT OF DATE) > Soil > Flashcards

Soil Flashcards

1
Q

Why is soil important for the vine?

A

It anchors the vine and provides nutrients for growth.

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2
Q

Define soil’s origin and properties.

A

The result of physical, chemical, and biological processes acting on organic substances and inorganic weathered rock (mineral matter) that accumulate on Earth’s surface.

It is porous, containing water and air.

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3
Q

What are the general proportions of soil components?

A

40-60%
Mineral Matter

20-50%
Water

10-25%
Air

Remainder
Organic

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4
Q

How has old world winemaking influenced the perception of soil fertility and viticulture?

A

Experiential learning has shown that stony, low fertility soil with good drainage restricts vegetative growth, warms quickly and radiates heat. The latter attributes are particularly important in cooler, damper environments.

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5
Q

What are the physical properties of soil?

A

Texture

Structure

Color

Water Availability and Drainage

Air

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6
Q

What are the chemical properties of soil?

A

Soil Acidity/PH

Nutrient Status

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7
Q

What are the biological properties of soil?

A

Organic Matter

Humus

Micro-organisms

Organisms

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8
Q

What type of soil can vines grow in?

A

A wide range that can be ameliorated to provide sufficient nutrients to the vine.

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9
Q

What is an important consideration when planting a vine regarding the availability of water, nutrients, etc.?

A

That the rootstock is appropriate to the soil.

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10
Q

What properties of the soil do texture and structure affect?

A

Water Availability and Drainage

Nutrient Availability

Aeration

Root Growth

Erosion

Ease of Cultivation

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11
Q

What are common soil particles and their relative diameter, in millimeters?

A

Clay
<0.002mm

Silt
0.002-0.02mm

Fine Sand
0.02-0.2mm

Sand
0.2-2mm

Gravel / Grit / Stones
>2mm

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12
Q

What is a Colloid?

A

A particle smaller than 0.001mm (1 micrometer, 1μm)

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13
Q

What is Soil Texture?

A

A measure of the proportions of inorganic clay, silt and sand that soil contains.

These particles are graded by their size.

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14
Q

What are the classifications of soil texture and their parameters?

A

Sand: 5% Clay particles

Loam: 25% Clay particles

Clay: 50% Clay particles

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15
Q

Which soils are heaviest and which are lightest?

A

Clay soils are heaviest.

Sandy soils are lightest.

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16
Q

Which soils are typically preferred for viticulture?

A

Loam soils.

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17
Q

Which soils hold more water content and why?

A

Heavy soils due to their high clay or silt content. The smaller particles hold water tightly on their surface..

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18
Q

Which soils hold less water content and why?

A

Light soils due to their high sand and gravel content. The larger particles create space that allows water to drain freely.

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19
Q

What are the benefits and risks of using coarser soils?

A

The soil offers good drainage which can benefit vines in damp regions, though whatever water remains is easily accessible. They do not typically retain nutrients. In some places, both water and nutrition can be controlled.

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20
Q

Regarding Microclimate, why is the proportion of clay in a soil important?

A

1) Clays have a great capacity to bind and hold water and nutrients.
2) Clay particles are negatively charged, so they can hold more nutrient elements (minerals).
3) The water absobed by clay may not be available to the vine.
4) Clay tends to heat up slower in spring and be cooler year round due to its water retention.

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21
Q

Viticulturally, why is the proportion of clay in a soil important?

A

1) Clay is slippery and expands when wet but shrinks when it dries. This can crack the Clay which forces the water out and could hurt the vine’s roots.
2) Clay becomes sticky when wet, making it difficult to work and drive on with machinery.
3) The structure of clay deteriorates when it is worked.
4) Dry clay soils are hard and solid, making root penetration difficult.

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22
Q

When does the presence of clay best benefit a vine?

A

When there is a proportion of larger particles to aid aeration and drainage. Mixing Clay with larger particles pushes the soil type closer toward a preferred Loam style.

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23
Q

Describe the characteristics of predominantly Sandy soils.

A

Coarse textured

Allow easy root penetration

Low nutrition and high drainage

May collapse under excess water

Heat up more quickly in Spring and are generally warmer than Clay soils

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24
Q

Describe the characteristics of soil that is predominantly Clay and Silt.

A

Fine textured

Impede root growth

High nutrition, water retaining

More stable than Sandy soils

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25
Q

Describe the characteristics of Loam soils.

A

A largely balanced mix of Clay, Silt, and Sand.

Freely draining with large water retention capacity.

Possess some of the drainage of Sandy soils and a good proportion of the water and nutrient retaining Clay soils.

Fertile and can encourage too much vegetative growth.

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26
Q

True or False

Particles greater than 2mm are excluded from soil texture measurements.

A

True, though Gravel and larger stones have important effects on soil.

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27
Q

What effects do Gravels have on soils?

A

In the soil they reduce water retention and improve drainage

On the soil they reduce erosion and aid soil moisture conservation

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28
Q

What effect does Gravel have on Microclimate?

A

They store heat during the day and radiate it back into the canopy at night.

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29
Q

What is Soil Structure?

A

The Friability of the soil.

How clay, silt, and sand clump together to form aggregates and how readily the aggregates crumble.

How well the soil forms lumps and crumbs.

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30
Q

What are the characteristics of well structured soil?

A

Roots can easily penetrate

Water and air can access the soil

Resistant of wind and water erosion

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31
Q

What is a Soil Aggregate?

A

Groups of soil particles bound more strongly to each other than to surrounding particles. These aggregates form a matrix that creates the overall Soil Structure.

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32
Q

Why is organic matter important to the formation of Soil Aggregates and how does the process work?

A

Aggregates start to form when Colloidal Clay binds with organic matter such as water, microbial filaments, and organic secretions.

These then bind with silt, sand, and other organic particles to form Aggregates.

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33
Q

What is the effect of organic matter on Friability?

A

Organic matter improves Friability. The ideal level of organic matter in a soil is 3-10%, considered moderate to high.

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34
Q

What is the ideal level of Friabaility of a soil?

A

Aggregates up to 2cm that crumble easily increases the rate at which water and air move through soil and subsoil. Roots can also penetrate with ease.

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35
Q

What is the correlation between Friability and the access roots, water, and air have to a soil?

A

Direct positive correlation.

More Friability means more root, water, and air penetration.

Less Friability means less access as the Aggregates do not crumble easily.

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36
Q

What influences soil structure?

A

Organic matter

Earthworms and other soil organisms

Wetting and drying

Freezing and thawing

Presence of plant roots

Cultivation and other soil management practices

Texture

Drainage

Compaction

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37
Q

How can the stability of a soil be improved?

A

The addition of more organic matter

The activity of soil organisms

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38
Q

How do earthworms improve Soil Stability?

A

They help bind soil particles into stable aggregates

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39
Q

What can poor Soil Structure lead to?

A

Capping/Crusting: the hardening of the soil’s surface

Puddling: rainwater stays on the soil surface, causing extensive erosion

Sieving: Clay particles are carried down with the water through the soil, sometimes forming a layer that prevents drainage and aeration

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40
Q

Why is it important for air to penetrate into the soil?

A

The growing tips of vine roots and aerobic soil microbes require oxygen to grow

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41
Q

Why is water penetration important?

A

Root tips require water to obtain nutrients. Too much, however, will drown the tips and cut off their air supply.

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42
Q

What is Waterlogging?

A

inadequate drainage that decreases soil aeration, thus restricting root growth and the depth at which roots can reach.

Prolonged waterlogging can kill roots from lack of air.

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43
Q

How does subsoil help vines in regions with dry summers cope with the lack of water?

A

The roots can tap into water stored in the subsoil late in the season.

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44
Q

What soils are most fertile?

A

Loamy soils.

Those with a balance of freely draining soil structure and large water holding capacity.

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45
Q

How much water do vines need during the growing season?

A

500mm (more in hot conditions)

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46
Q

The rate of vine growth in many wine regions is largely determined by what?

A

The availability of water.

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47
Q

Why is aeration essential in soil?

A

Provides oxygen to aerobic organisms and suppresses growth of anaerobic organisms

Removes carbon dioxide and other waste gases formed by breakdown of organic matter and by plant roots

Provides roots with oxygen essential for respiration and growth

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48
Q

In what soils can air movement be severely restricted?

A

Poorly structured clay soils

Heavily compacted soils

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49
Q

Aeration is affected by the ability of the soil to do what?

A

Drain effectively

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50
Q

What determines a soil’s ability to drain water effectively?

A

Soil structure and depth of impermeable soil layers

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51
Q

Vines do not grow well on poorly drained soils. Why?

A

The soils are cooler and take longer to heat in the spring.

They restrict root growth, leading to a reduced resistance to drought and an increased risk of mineral deficiency

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52
Q

How does drainage affect machinery in the vineyard?

A

Poor drainage reduces the bearing capacity of a soil.

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53
Q

What effect does soil compaction have in the vineyard?

A

Poor rain infiltration (increased erosion)

Poor soil structure (reduced drainage aeration, and root penetration.

54
Q

What are the biological aspects of a soil attributed to?

A

The microscopic and visible organisms that are mostly active in the top 10cm of soil.

55
Q

From where does the organic matter in soil originate?

A

Plant and animal remains, secretions, and excretions broken down in the soil by soil organisms.

56
Q

What are some soil organisms?

A

Beetles

Mites

Earthworms

Fungi

Bacteria

57
Q

What is the organic content in soil?

A

Sugars

Starches

Cellulose

Nitrogenous Compounds

Lignin

Mineral Matter

58
Q

What organic content is rapidly broken down by soil organisms?

A

Sugars

Starches

Nitrogenous Compounds

Some Cellulose

59
Q

What is Humus?

A

Residual organic matter composed of Lignin, Mineral Matter, and Cellulose not broken down by soil organisms. It decomposes much more slowly than other organic content and forms a significant portion of the soil’s organic material. It is a black or brown colored mixture.

60
Q

What is the benefit of organic matter to soil?

A

Increases nutrient availability

Improves water permeability and retention

Makes heavy clay soils more friable

The major water and nutrient storing component of loose, free-draining sandy soils

61
Q

What benefit does Humus have on soil?

A

Maintains soil structure by binding particles

Retains available nutrients

High water retention capacity

Small range of swelling and shrinking and easy to crumble

Gradually releases nutrients as the Humus is slowly mineralized

Darkens the color, increasing heat absorption

62
Q

What are soil layers?

A

Stratifications of the soil texture and structure over time.

These can be investigated by digging a soil profile, revealing the depth of the layers, their drainage, and any root barriers.

63
Q

Which soil organisms are considered Macrofauna?

A

Burrowing vertebrates

Moles, Rabbits, etc.

64
Q

Which soil organisms are classified as Mesofauna?

A

Invertebrates

Slugs, snails, nematodes, worms, earthworms, wildlife, mites, insects, centipedes, millipedes

65
Q

Which soil organisms are classified as Microorganisms?

A

Algae, Bacteria, Fungi

66
Q

How do Microorganisms benefit soil?

A

They break down dead organic matter for their own growth, converting essential elements in organic matter into simple inorganic forms. These inorganic materials are important for the next generation of plants.

67
Q

What is Mineralization?

A

The decomposition of chemical compounds in organic matter which are released by Microorganisms as soluble, inorganic forms.

68
Q

Where does chemical activity occur in soil?

A

The colloidal fraction, the matrix of tiny clay particles and organic matter.

69
Q

What are the chemical properties of soil?

A

Nutrient availability

Soil acidity and pH

70
Q

What are Macronutrients? Name them.

A

Elements that plants require in relatively large quantities.

Nitrogen (N)

Phosphorus (P)

Potassium (K)

Calcium (Ca)

Magnesium(Mg)

Sulfur (S)

71
Q

How does Nitrogen appear in soil?

A

It is derived from decomposing organic matter and the fixation of atmospheric nitrogen.

72
Q

How does Phosphorus appear in soil?

A

It is insoluble and, thus, poorly available. Microorganism activity helps make phosphorus more available.

73
Q

How does Potassium appear in soil?

A

It is a constituent if clay minerals. Acidic soils may not have enough, thus requiring fertilization.

74
Q

How does Calcium appear in soil?

A

It is found in limestone, typically as particles of Calcium Carbonate.

75
Q

How does Magnesium appear in soil?

A

It is more common in loam and clay soils. Magnesium deficiency is more likely in sandy soils.

76
Q

How does Sulfur appear in soil?

A

Naturally or by applications in the vineyard.

77
Q

What are Micronutrients? Name them.

A

Nutrients that the vine needs in very small quantities.

Iron (Fe)

Manganese (Mn)

Molybdenum (Mo)

Copper (Cu)

Zinc (Zn)

Boron (B)

78
Q

How does Iron appear in soil?

A

Iron is present and available in all soils except calcareous soils.

79
Q

How does Manganese appear in soil?

A

Clay and Loam soils are typically well supplied with Manganese but its availability reduces as pH increases. Deficiency can occur in lime-rich soils.

80
Q

How does Molybdenum appear in soil?

A

It is available in more basic (higher pH) soils.

81
Q

How does Copper appear in soil?

A

Rarely deficient due to copper-containing fungicide sprays (Bordeaux Mixture). It is less available in low pH soils.

82
Q

How does Zinc appear in soil?

A

It is available in most soils and may be unavailable to vines in calcareous soils.

83
Q

How does Boron appear in soil?

A

It is readily available but may be restricted by dry soils.

84
Q

What depletes the pool of available minerals in soil?

A

Vine growth

85
Q

What augments the pool of available minerals in soil?

A

Weathering of rock minerals

Precipitation and deposition from the atmosphere

Mineralization of organic matter

Application of mulches and inorganic fertilizers

86
Q

Which elements are necessary for vine growth that are not considered in soil analysis? Why?

A

Carbon (C), Hydrogen (H), and Oxygen (O) are supplied atmospherically as Carbon Dioxide and Water.

Chlorine (Cl) is widely available.

87
Q

What is pH?

A

A logarithmic scale of the acidity or alkalinity of a solution.

The lower the number, the more acidic the solution is.

88
Q

What are the ideal pH level and range for viticulture?

A

Ideal
~7

Optimum Range
5.5 - 8

89
Q

What is the effect that pH has on viticulture?

A

pH affects the solubility of nutrients and, thus, their availability to the vine.

90
Q

What effect does acidic soil have on vine growth?

A

They are detrimental to vine growth, causing notable nutrient deficiencies such as Nitrogen and Phosphorus.

Soils with pH <5 cause Aluminum and Manganese toxicity.

At pH 4.5, the soil becomes too acidic for vines to perform.

91
Q

How can soils be made less acidic?

A

Applying lime or dolomite can increase alkalinity. This should be done before planting vines as it will take time for the minerals to reach the root zone.

92
Q

What level of soil pH typically occurs in regions where rainfall exceeds 500mm?

A

Acidic soils are typically associated with such excessive rainfall and may need soil treatments for amelioration.

Rain leeches basic elements such as lime and chalk from the soil in runoff.

Bordeaux is an example.

93
Q

What level of soil pH typically occurs in regions with less than 500mm of rainfall?

A

Alkaline soils. There is less runoff due to rain and, thus, more availability of chalk and lime.

94
Q

What conditions show the most noticeable influence of bedrock?

A

Temperate regions

Young soils

95
Q

What is the main determinant of the mineral composition of soil?

A

The parent material, though parent rock does not necessarily dictate quality of fruit.

96
Q

What are the three main rock types?

A

Igneous

Sedimentary

Metamorphic
(heated and/or pressurized sedimentary rock)

97
Q

What are the viticulturally important bedrocks?

A

Limestone

Chalk

Slate

Schist

Granite

Volcanic rocks

98
Q

What is the effect of cultivation on soil pH?

A

Soils tend to become more acidic due to the release of organic acids on the breakdown of organic material.

99
Q

What is Limestone? Where is it commonly found?

A

A sedimentary rock formed mainly of calcium carbonate.

Jerez, Spain
Limestone Coast, Australia
Burgundy, France
St. Emilion, Bordeaux, France

100
Q

What is Chalk? Where is it commonly found?

A

A soft, fine-grained, sedimentary type of limestone

Champagne, France
Chablis, France

Portlandian Limestone can be found in

Central Vineyards, Loire Valley, France
Touraine, Loire Valley, France
Southern England, U.K.

101
Q

What is Kimmeridgian Limestone?

A

A limestone deposited in the Kimmeridgian period, 157-152 million years ago. Kimmeridgian limestone is rich with fossilized seashells and minerals.

102
Q

What is Kimmeridgian Soil?

A

A gray colored soil based on Kimmeridgian limestone. Kimmeridgian Clay is a clay-based soil containing the same limestone. It is soft and water retaining.

The principal soil type of the Loire Valley, Chablis, Champagne, and Burgundy.

103
Q

What is Portlandian Limestone?

A

A limestone deposited in the Portlandian period, 120-130 million years ago. It has a higher lime content than Kimmeridgian limestone and is susceptible to fracturing and shattering. It does not contain fossilized seashells characteristic of Kimmeridgian limestone.

104
Q

What is Portlandian Soil?

A

A sandy limestone soil found above Portlandian Limestone in Chablis. It lacks the mineral content of and does not retain water as well as Kimmeridgian Soil.

105
Q

What is Slate? Where is it commonly found?

A

A metamorphic rock mostly derived from shale usually formed into flat sheets

Mosel, Germany

106
Q

What is Shale?

A

A sedimentary rock formed from compacted clay, silt, or sand. It can from Slate when exposed to low-grade pressure or heat.

107
Q

What is Schist? Where is it commonly found?

A

A metamorphic rock composed largely of parallel layers. The composition of these layers varies but include Chlorite, Talc, and Graphite.

Douro, Portugal
Cote-Rotie, Northern Rhone, France

108
Q

What is Granite? Where is it commonly found?

A

A volcanic rock formed beneath the earth’s surface, giving it a medium to coarse-grained composition

Beaujolais, France
Alsace, France

109
Q

What are Volcanic Rocks? Where are they commonly found?

A

Igneous rocks formed at the earth’s surface, giving it a fine grained composition

Etna, Sicily
Madeira, Portugal
Kaiserstuhl, Southern Germany

110
Q

What depth of a soil profile is most critical and why?

A

The top meter as it contains the most nutrients and the bulk of the root zone.

111
Q

What pests can be found in soil?

A

Phylloxera

Nematodes

112
Q

What soils are the least preferred habitat of Phylloxera?

A

Sandy soils

113
Q

How does Phylloxera affect the vine?

A

It borrows into the vine’s root system and feeds off of its carbohydrates and water.

114
Q

What Nematodes are dangerous to grapevines that can be found in soil?

A

Root-knot Nematodes

Dagger Nematodes

115
Q

How do Root-knot Nematodes affect the vine? Where are they found?

A

They cause root damage, impeding water and nutrient uptake. This restricts growth, vigor, and yield.

Found primarily in Australian vineyards.

116
Q

How do Dagger Nematodes affect the vine? Where are they found?

A

They are implicated in the spread of diseases such as fanleaf virus

Found in vineyards around the world

117
Q

What choices are available to combat Nematodes in the vineyard?

A

Leaving vineyards fallow as the spread of infection by Nematodes is slow. The eggs, however, can survive for a long time so this expensive proposition may not be effective.

Nematocides can control Nematodes, but they kill both harmful and helpful Nematodes and can fail to eradicate the problem.

118
Q

What effect does high levels of salts in soil have on the vine?

A

Reduction of grapevine growth and yield

119
Q

What part of the world has issues with salinity in vineyards?

A

Australia

120
Q

What is the correlation between Calcium (Ca) in a soil and its pH?

A

Direct Correlation.

More Calcium = More Alkalinity

Less Calcium = More Acidity

121
Q

What is calcareous soil?

A

Soil with a high lime content

122
Q

What benefit does calcareous soil offer?

A

It can restrict Potassium (K) uptake into ripening fruit, maintaining lower juice pH.

Potassium increases pH, making the juice less acidic and, therefore, less desirable.

123
Q

What risks are associated with calcareous soil?

A

A lack of available Iron (Fe), Manganese (Mn), and Zinc (Zn)

Lime-induced Chlorosis is a visible symptom of Iron deficiency

124
Q

What is the role of Calcium in the soil?

A

It is an important component of soil structure and helps maintain the stability of soil aggregates.

The amount of Calcium in a soil also determines the soil’s pH. Too much creates alkaline soils while too little creates acidic soils

125
Q

What is Calcite?

A

A limestone also known as Calcium Carbonate

126
Q

What is Dolomite?

A

A limestone that is a mixture of Magnesite (Magnesium Carbonate) and Calcite (Calicium Carbonate)

127
Q

What is Magnesite?

A

A limestone also known as Magnesium Carbonate

128
Q

What is Gypsum?

A

A fairly soluble calcium mineral that helps keep soil aggregates together. It also prevents them from breaking down into their constituent parts (sand, silt, clay particles) and reduces susceptibility to waterlogging.

129
Q

What is Marl?

A

A crumbly mix of clay and limestone

130
Q

Where does most biological activity in a soil take place?

A

The upper 10cm

131
Q

How does drainage work?

A

Water infiltrates the soil profile and is held temporarily according to the soil’s storage capacity. It is here where the water is available to the vine’s roots.

The water is then drained downward to the water table.

WSET Diploma Unit 2 (OUT OF DATE) (18 decks)

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