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3.4 Soil
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What type of soil is best for rice farming?
clay soil
Why must soil be turned regularly?
mix air and organic matter
How can artificial fertilisers damage soil?
dry the soil
How can pesticides harm soil?
kill organic matter
How can growing the same crop damage soil?
removes nutrients
Why must nutrients be replaced?
plants use them up
How is compost different from artificial fertiliser?
improves texture
Why is compost added to soil?
replace nutrients
What must farmers do if there is no rain?
water the soil
How do farmers add air into soil?
digging
What is needed in soil to maintain its composition?
air
What else does organic matter provide?
nutrients
How does organic matter help soil?
holds water
Why is loam suitable for growing plants?
balanced composition
What is the particle size of loam?
mixed
What is the particle size of clay soil?
small
What is the particle size of sandy soil?
large
What happens to clay soil in hot weather?
it cracks
Why does clay soil become waterlogged?
water cannot drain
Why does clay soil have little air?
small particles packed tightly
Why does sandy soil contain more air?
large particles
Why does sandy soil drain water easily?
large air spaces
What type of soil forms from igneous rocks?
sandy clay soil
What type of soil forms from shale?
clay soil
What type of soil forms from sandstone?
sandy soil
What does the colour of soil indicate?
amount of organic matter
Give two words that can describe soil texture.
sticky crumbly
What does soil texture describe?
how soil feels
What are the main components of soil?
rock particles, organic matter, air, water
How is soil formed?
weathering of rocks
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