1. Look at the melon color. The skin, pedicel and navel of desert melon in Ningxia should be valued. Desert melons with regular melon shape and clear texture are generally popular, and black-skinned melons should be dark and shiny. In addition, the pedicel and umbilical part of the melon should be tightly closed and slightly retracted. It is better for the vine handle to be close to the skin of the melon downwards, and the proximal part is thick and green, which is a sign of maturity.

2. Listen to the melon sound. To identify the sound of watermelon, you can hold the watermelon in your hand and pat it gently with one hand. If you make a "thump" sound and the feeling of dragging the watermelon is a little shaky, it is a ripe melon. If you make a "chug" sound, it is a relatively mature reaction. Generally, watermelons that make a poof-poof sound are over-mature melons, and those that make a clicking sound are raw melons.

3. weigh the melon. Feel the weight of watermelon. If the watermelon of the same size is heavier and more mature, its weight will be lighter. If the water content of raw melon is relatively high and the melon body is relatively heavy, then the mature melon will be heavier because of the crisp hanging meat and loose tissue.