Sweet delicious carrots can only be achieved by growing your own. Approximately 620 seeds/gram
Hints:

Soil should be worked 15 to 25 cm [6-8"] deep.

Avoid fresh manure which may cause forks, splits and tough hairy roots.

Sow seed at a rate of 2-3 per 2 cm about 1 cm deep.

Carrot seeds need to stay damp until sprouted.

Sprouts will NOT push through crusted soil.

Harvest after carrots have a good orange colour when flavour is best.

Kuroda - 70 days. A popular variety in the orient, the roots are large, juicy and have exceptional flavour. Strong tops. Grows quickly with wide top or shoulder and slight taper to tip, so space and thin more than other varieties. Approximately 18 cm [7"] long.