.
12. How does chemical nature of the soil change
due to continued use of chemical fertilizers ?
13. Explain various methods of fertilizer application.
14. Distinguish between farmyard manure and
compost manure.
15. Define manure. What are different manures and
how do they affect the soil ?
16. What is green manuring ? Give suitable
examples for green manures.
17. What are fertilizers ? Classify fertilizers.
18. Give a short account of biofertilizers.
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12.The most rapid removed chemicals are chlorides and sulphates, followed by calcium, sodium, magnesium and potassium. ... This gas combined with water can form a weak acid (carbonic acid) which will then react with some of the soil chemicals to form new ones.
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