Why do my cucumbers grow into round balls?

I planted a garden this summer and everything has turned out well except for my cucumbers, they seem to grow in odd shapes and are half green and half yellow.I've eaten one and it was very tasty.

Try ammending the soil next crop with lots and lots of composted compost that is rich in vitamins and minerals.The kind of black soil compost that is called black gold add to it andfertilize it.

The last 8 in the fertilization is the fruit or food maker that makes your fruit grow out of the flowers big and green.