Singh, addressing a press conference here today, said that in order to achieve the target of doubling farmers' income in five years, the agriculture sector needed to grow at a rate of 10 per cent.
He also slammed the Modi government, saying its "nice sounding slogans" such as 'Start up India, Stand up India' and 'Skill India' are not backed by effective policies.
Modi has said that he dreamt of seeing farmers' income getting doubled by 2022 when the country completes 75 years of its Independence.
Singh said that the average growth of agriculture in the first three years of the Modi government "is only 1.8 per cent per year. This is half the average of agricultural growth of 3.7 per cent, which we have achieved in our ten years (of UPA rule)."
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Stating that 50 per cent of the country's population is dependent of agriculture, the former prime minister said, "Modiji has given the slogan of doubling the farm income in five years. Doubling it in five years requires an annual growth rate of farm incomes of 14 per cent."
"I have seen no programme that would achieve such a growth for the country's farmers as a whole. Perhaps, this is another election jumla (rhetoric). But, I feel that the government would be well-advised to come forward with a credible plan to achieve a growth rate of this order," Singh said.
While sharing his views on the negative effects of demonetisation, Singh also took a dig at Modi's other initiatives -- 'Start up India, Stand up India' and 'Skill India', saying there exists no policy in place to back these "nice sounding slogans".
In a veiled attack on Modi's style of functioning, Singh said leaders should also listen to the criticism to take corrective action instead of just expecting praise.
"I have spent a lot of time on demonetisation because it worries me that in a world, where economic policy is becoming increasingly complex, we are not developing a culture where policy option are critically-assessed and criticism offered are heard to take a corrective action," he said while expressing his views on the note ban.
The senior Congressman also raised doubts over Modi's claim of making India a developed economy by 2022.
"He was recently quoted in the press as saying that India will become a developed country by 2022. I would be the happiest person in the world if he can delivers (on) that. But, is he really aware of what it implies?" Singh asked.
According to him, Greece, which is at the lower end of developed countries, has a per capita income of USD 25,000, while India's current per capita income is USD 5,000.