NPK Fertilisers

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14 Terms

1
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What are the three salts in NPK fertilisers
Nitrogen, Phosphorus and Potassium
2
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Why may the soil be deficient in nutrients
Used up by previous crops
3
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What does ammonia produce when it is reacted with water and oxygen
Nitric acid
4
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What does ammonia produce when it is reacted with nitric acid
Ammonium nitrate
5
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Why is ammonium nitrate a good compound to use in a fertiliser
Has nitrogen from two sources
6
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What is the formula of an ammonium ion
NH4+
7
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What two potassium salts are mind and used as a source of potassium
Potassium chloride and potassium sulfate
8
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Why can’t the salts phosphate rock be used by plants to acquire nutrients
Because the phosphate salts in the rock are insoluble
9
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What do we react with phosphate rock to produce soluble phosphates
Acids
10
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Phosphate rock + Nitric acid goes to…
Phosphoric acid and calcium nitrate
11
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Phosphate rock + Sulfuric acid goes to…
Calcium sulfate and calcium phosphate
12
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What is the mixture of calcium sulfate and calcium phosphate known as
Single superphosphate
13
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Phosphate rock + Phosphoric acid goes to…
Calcium phosphate
14
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What is calcium phosphate known as
Triple superphosphate