Poor countries claim they have met rich nations’ demands to constrain tariff protection for vulnerable farmers, a move they said should boost the flagging Doha round of global trade talks.

A meeting of the Group of 33 developing countries in Indonesia said it had reduced by half the indicators it would use to determine which agricultural products would receive special protection. But rich countries declined to say whether the concessions were sufficient to induce them to make fresh offers in the talks, which have been spluttering since their restart in January.