Agriculture

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35 Terms

1
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What four components make up soil?
Organic matter

Inorganic matter

Water

Air
2
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Describe the characteristics of sandy soils
\-gritty in texture

\-water drains through it easily

\-sand dries up quickly
3
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Describe the characteristics of clay
\-it drains slowly

\-sticky when wet and hard when dry
4
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Describe the characteristics of silt
\-fairly well drained

\-tends to hold more moisture that sandy soils
5
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What is the use of nitrate ions in plant growth
they combine with glucose to form amino acids which in turn bond together to create proteins needed for plant growth.
6
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What is the use of phosphates in plant growth
They are an important component of DNA and cell membranes and is required for respiration and growth
7
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What is the use of potassium in plant growth
It must be present for the enzymes required for photosynthesis and respiration to function effectively
8
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What is the use of magnesium in plant growth
It is used for manufacturing chlorophyll without it photosynthesis would not occur
9
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What is the use of organic matter in soil fertility
\-it increases the water holding capacity

\-it increases the air spaces within the soil

\-it prevents the loss of mineral nutrients

\-it increases the number of decomposers thus providing additional drainage
10
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Describe the differences between clay and sand
\-sand has large air spaces while clay has poor air spaces

\-sand drains well while clay has poor drainage

\-sand has poor retention of humus while clay retains humus (aka moisture)

\-sand is easier to cultivate while clay is harder to cultivate
11
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Name the different types of agriculture
Subsistence farming

Commercial farming

Arable

Pastoral
12
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Describe Subsistence farming
It is the cultivation of food to meet the needs of the farmers and their families
13
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Describe commercial farming
It is the cultivation of food with the main aim of selling it for cash
14
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Describe arable farming
It is the production of plants for consumption by humans
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Describe pastoral farming
It is the rearing of animals and production of animal related products
16
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Name ways you can increase agricultural yields
\-Crop rotation

\-Fertilizers

\-Irrigation

\-Mechanisation

\-Selective breeding

\-Genetically Modified Organisms(GMOs)

\-Controlled environments

\-Pesticides
17
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What are the advantages of crop rotation?
\-diseases in the soil affecting the plant are left behind

\-the soil in the new plot is likely to have essential nutrients needed for the growth of another crop

\-pest population is reduced as they need to find a new site
18
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Describe the advantages and disadvantages of overhead sprinklers
Advantages

\-it is easy to set up

\-can cover a large area with one sprinkler

Disadvantages

\-large droplets may cap the soil

\-small droplets my be blown away by wind

\-water lands on leaves and soil and may evaporate easily
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What are the advantages and disadvantages of clay pot irrigation
Advantages

\-simple technology is used

\-easy to check the amount of water used

Disadvantages

\-only suitable for permanent plants

\-large labor cost
20
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What is the use of water in plants?
\-it is essential for cell activity

\-it is used in photosynthesis

\-mineral uptake requires water in the soil
21
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What are the advantages and disadvantages of trickle drip irrigation?
Advantages

\-water is placed directly at the base of the plant

\-it is automated and controlled via computer

\-water is used very efficiently

Disadvantages

\-expensive to install and complex to maintain

\-grit can block tubes
22
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What are the advantages and disadvantages of flood irrigation?
Advantages

\-inexpensive

\-can cover large areas quickly

Disadvantages

\-inefficient use of water

\-damages soil structure
23
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What are the benefits of mechanisation?
\-larger area can be cultivated

\-reduces labor costs

\-ploughing can be done even when the soil is heavy
24
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Why should pests be controlled?
\-they compete with crops for light, water and nutrients

\-they reduce the quality of a seed or grain crop

\-they might be poisonous

\-they make cultivation difficult
25
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What are the advantages and disadvantages of biological control in dealing with pest problems?
Advantages

\-no chemical residue

\-no need to reapply

\-the predator will die naturally when the pests are controlled

Disadvantages

\-not as instant as chemical control

\-pests may breed faster than the predator

\-predator my feed on unintended plant
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