The government will come out with details of a new scheme for farm sector projects by states in the next 4-6 weeks to implement the Rs 25,000 crore (Rs 250 billion) plan announced by Prime Minister Manmohan Singh last month.

"We are currently working with Ministry of Agriculture on implementing a new additional central assistance scheme," Planning Commission Deputy Chairman Montek Singh Ahluwalia said in New Delhi on Tuesday.

States have been advised to come up with their own agricultural plan, which should be consistent with their target for the sector and also with the country's aim to register four per cent growth in farming, Ahluwalia said.

"We expect that they (states) will provide their own resources up to a base line as a share of the total plan which we will determine, perhaps in the current year itself. Any expenditure above the base line can be met with a central contribution on a sharing basis," he added.

The new scheme would not be subject to crop specific conditionalities like the present centrally-sponsored schemes, the deputy chairman clarified.

"The agriculture ministry and we are working on this and we hope within the next 4-6 weeks we will work out the details of this plan," he said, adding that states that are quick to respond should be able to get assistance under this programme even in the current year.

While detailing the issues which emerged in the recently concluded National Developmnet Council meet, Ahluwalia said the yield potential for new variety for last four-five years has flattened, indicating a 'technology fatigue'.

He said the gap between yield potential of existing varieties and the actual realisation was 40-50 per cent in many cases and 300 per cent in one case.