"On World Soil Day we reaffirm our commitment to making our soil healthier. When soil is in good heath, our farmers get more wealth," he tweeted.
"From today, there will be nationwide initiatives where farmers will get soil health cards and other inputs. Best wishes to farmers and officials," Modi said in another tweet.
The government's soil health card is an endeavour to improve the health of the soil and provide guidance to farmers on soil-related issues, he said.
Under the scheme, soil health cards are proposed given to all 14.5 crore farmers in the country in the next three years. The cards will carry crop-wise recommendation of fertilisers required for farm lands, thereby helping farmers in identifying health of soil and judiciously use soil nutrients.
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The government has set a target to collect 102.61 lakh samples in the 2015-16 fiscal. Till last month, it has able to collect over 55 lakh samples, of which 31.43 lakh samples have been tested and 26.53 lakh soil health cards have been issued, as per the Agriculture Ministry's data.
The ambitious scheme was announced in the first budget presented by Finance Minister Arun Jaitley in July last year.
The flagship scheme of the ministry has been sanctioned Rs 568 crore for the next three years.
The scheme assumes importance as the imbalanced application of fertilisers have caused deficiency of primary nutrients (nitrogen, phosphorus, and potassium), secondary nutrients (such as sulphur), and micro-nutrients (boron, zinc, copper etc.) in most parts of country.