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Because fertilizer contains alot of chemicals which help the plant to grow well and quickly.

Use of fertilizers is needed for all types of long-term crop production in order to achieve yield levels which make the effort of cropping worthwhile. See this website for a detailed discussion:

http://www.fertilizer.org/ifa/publicat/html/pubman/introd2.htm

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Q: Why is it necessary to use fertilizer in agriculture?
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