Answers

2015-07-01T22:12:34+05:30
They are used in wheat crop because it is a plant which gets many threats like insects,pests,climatic changes,fertility of the soil,etc.........
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2015-07-03T17:49:45+05:30
The fertilizers/manure  used in wheat crops are:- 
.Nitrogenous fertilizers.
.Potassic fertilizers.
.Phosphatic fertilizers.
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