Turtle to reproductive age, and in the appropriate breeding season will lay eggs, this is their reproductive mode. Turtles reach a certain age before they reach functional maturity, at which time they can reproduce. Generally speaking, most turtles have the ability to reproduce when they are 4-5 years old. But the specific is not sure, because some turtles sexual maturity time will be slightly earlier, in 3 years old or so can be sexually mature. When raising turtles in captivity, you can also try to breed them.
As mentioned above, after the turtle reaches the age of sexual maturity, it will breed in the appropriate breeding season. Specifically, turtles have higher requirements for water temperature when they breed, so they will breed when the water temperature is suitable. Summer is the right season for turtle breeding. Specifically, first mating, then laying eggs, and then hatching eggs. In fact, even without mating, female turtles can lay eggs, but these eggs can not hatch, because they have not yet been fertilized. The period of soft-shelled turtle laying eggs is between June and September every year, and the peak period is between June and July.
If you want to let the artificially raised turtles lay eggs, you can artificially control the surrounding environment. For example, you can prepare a special incubator, and set up some special tools in it, such as ventilation windows, for example, you can also prepare an infrared bulb, which can be used as a heat source and so on.