Baltic index posts first weekly fall in seven on lower vessel rates

May 27 (Reuters) - The Baltic Exchange's main sea freight index extended decline for the fourth straight session on Friday and was headed for its first weekly fall in seven as rates across all vessel segments dipped.

* The overall index, which factors in rates for capesize, panamax, supramax shipping vessels, lost 252 points, or 8.6%, to 2,681. It fell 19.8% for the week.

* The capesize index dipped 660 points, or around 19%, to 2,818 points. The index fell about 38% this week.

* Average daily earnings for capesizes, which typically transport 150,000-tonne cargoes such as iron ore and coal, were down $5,467 at $23,373.

* Ukraine is desperately trying to export its vast stores of grain by road, river and rail to help avert a global food crisis but has no chance of hitting its targets unless Russia's blockade of its Black Sea ports is lifted.

* The panamax index fell 92 points, or 2.9%, to 3,048. The segment was down about 9.9% in four weeks.

* Average daily earnings for panamaxes, which usually carry coal or grain cargoes of about 60,000 to 70,000 tonnes, decreased $828 to $27,431.

* The supramax index lost 27 points to 2,796 points. (Reporting by Rahul Paswan in Bengaluru; Editing by Shinjini Ganguli)