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Because we need to know is land fertile or not and agriculture will be prosperous or  not  

ph of soil has to be basic i.e7.0...then crops may grow properly

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So that we will come to know that the soil contains acid or a base .
if it does not have a ph of 7.0 ten we need to add fertilizer
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i am will go in 8 grade now i am in 7 grade
ohh good
u r male or female
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