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A rotor blade for a wind turbine is provided, wherein the rotor blade has radial bores in a wall of a blade root portion, the radial bores being staggered in a longitudinal direction of the rotor blade, and longitudinal bores in the wall of the blade root portion, wherein each of the longitudinal bo

A rotor blade for a wind turbine is provided, wherein the rotor blade has radial bores in a wall of a blade root portion, the radial bores being staggered in a longitudinal direction of the rotor blade, and longitudinal bores in the wall of the blade root portion, wherein each of the longitudinal bores extends from a blade flange to a corresponding radial bore.

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What is claimed is: 1. A rotor blade for a wind turbine, comprising a first plurality of radial bores in a wall of a blade root portion, said first plurality of radial bores having a first diameter; a second plurality of radial bores in the wall of the blade root portion, said second plurality of r

What is claimed is: 1. A rotor blade for a wind turbine, comprising a first plurality of radial bores in a wall of a blade root portion, said first plurality of radial bores having a first diameter; a second plurality of radial bores in the wall of the blade root portion, said second plurality of radial bores having a second diameter different from the first diameter, said first and second plurality of radial bores being staggered in a longitudinal direction of said rotor blade; and a plurality of longitudinal bores in the wall of the blade root portion, wherein each of said plurality of longitudinal bores extends from a blade flange to a corresponding one of said first and second plurality of radial bores. 2. The rotor blade according to claim 1, wherein the longitudinal lengths of the longitudinal bores can be divided in a first group of short lengths and a second group of long lengths. 3. The rotor blade according to claim 2, wherein the longitudinal lengths of the adjacent longitudinal bores are alternately selected from the first and second group. 4. The rotor blade according to claim 1, wherein a first group of radial bores is located at a first longitudinal distance from the blade flange and a second group of radial bores is located at a second longitudinal distance from the blade flange, wherein said first distance is smaller than said second distance. 5. The rotor blade according to claim 4, wherein the radial bores are alternately selected from said first and second groups, when seen in a circumferential direction of the blade root. 6. The rotor blade according to claim 4, wherein the diameter of the radial bores in the first group is smaller than the diameter of the radial bores in the second group. 7. The rotor blade according to claim 1, wherein a first group of longitudinal bores has a first longitudinal length and a second group of longitudinal bores has a second longitudinal length, wherein said first length is smaller than said second length. 8. The rotor blade according to claim 7, wherein the longitudinal bores are alternately selected from said first and second groups, when seen in a circumferential direction of the blade root. 9. The rotor blade according to claim 1, wherein the distance between neighboring radial bores is adapted to provide sufficient structural strength for bearing extreme loads. 10. The rotor blade according to claim 1, wherein adjacent radial bores are longitudinally spaced from each other by 0.5 to 10 times the diameter of a radial bore. 11. A wind turbine rotor blade comprising, in a blade root section thereof, a first plurality of radial holes in a wall of a blade root portion, said first plurality of radial holes having a first diameter; a second plurality of radial holes in the wall of the blade root portion, said second plurality of radial holes having a second diameter different from the first diameter, said first and second plurality of radial holes being staggered in a longitudinal direction of the rotor blade; and a plurality of longitudinal holes, each longitudinal hole connecting a hub end of said rotor blade and a radial hole, wherein said plurality of longitudinal holes comprises a first group of short holes and a second group of holes so that the radial holes associated with the first group and the radial holes associated with the second group are spaced with respect to each other in a longitudinal direction of the rotor blade. 12. The wind turbine rotor blade according to claim 11, wherein the lengths of the longitudinal holes in the first group are equal. 13. The wind turbine rotor blade according to claim 11, wherein the lengths of the longitudinal holes in the second group are equal. 14. The wind turbine rotor blade according to claim 11, wherein the difference in the longitudinal length between the first and second groups is in the range of 1% to 60% of the longitudinal length of the long holes in the second group. 15. The wind turbine rotor blade according to claim 11, wherein the longitudinal holes are alternately selected from the first and second groups, when seen in a circumferential direction of the root section. 16. A wind turbine having at least one rotor blade, said rotor blade being attached to a hub by means of a T-bolt connection, wherein the T-bolt connection comprises fastening bolts inserted into longitudinal bolt holes provided in a blade root of the rotor blade, and cross bolts inserted into a plurality of radial bolt holes provided in the blade root of the rotor blade, wherein the plurality of radial bolt holes comprises: a first plurality of radial bores in a wall of a blade root portion, said first plurality of radial bores having a first diameter; a second plurality of radial bores in the wall of the blade root portion, said second plurality of radial bores having a second diameter different from the first diameter, said first and second plurality of radial bores staggered in a longitudinal direction of the rotor blade; and wherein short longitudinal bolt holes and corresponding short fastening bolts and long longitudinal bolt holes and corresponding long fastening bolts are provided in said T-bolt connection. 17. The wind turbine according to claim 16, wherein the short longitudinal holes have the same length. 18. The wind turbine according to claim 16, wherein the long longitudinal holes have the same length. 19. The wind turbine according to claim 16, wherein the longitudinal length of the longitudinal bolt holes and corresponding fastening bolts alternates between long and short in a circumferential direction of the blade root. 20. The wind turbine according to claim 16, wherein adjacent radial bores are longitudinally spaced from each other by 0.5 to 10 times the diameter of a radial bore.