What do you mean by Olfactory Indicators ?
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The indicator that detects the presence of smell or any odour ,taste is called as an olfactory indicator.
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Manures and fertilizers help in conserving and enriching the fertility of the soil. By growing plants again and again on the same soil, the soil becomes deficient in nutrients. Thus it is necessary to replenish the soil with these nutrients. That's why farmers add manures and fertilizers to the field.
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nhi ho skte ban aur delete bhi honge toh new bna lungi hehe
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