Yellow watermelon. Yellow flesh watermelon, commonly known as "black gluten", is mostly planted in coastal and plain areas. Yellow-fleshed watermelon is a good fruit among melons, with oval shape, green yellow belt, obvious dark green reticulation, golden yellow flesh, crisp sweet sand, strong melon fragrance and unique flavor. The mature single fruit is about 1.5kg, which is suitable for planting coarse sand semi-fruit with good drainage.

Watermelon fruit is pulp fruit, fertilized by ovary. The whole fruit consists of peel, pulp and seeds. Among them, the peel develops from the house wall, the pulp develops from the placenta, and the seed develops from the fertilized ovule. Different varieties of watermelon show different shapes, sizes, skin colors, patterns and flesh colors. These characteristics are often used as the main basis for distinguishing varieties.

Identification of melon and fruit: The size of fruit mainly depends on the size of ovary and the development of fruit about 20 days after flowering. 4 ~ 5 days after the female flower blooms is the key period for fruit setting. In the following 15 ~ 20 days, the fruit volume mainly increased, and the growth accounted for about 90% of the whole melon weight. Before the fruit ripens 10 day, the volume increases slowly, mainly due to the changes of the internal components of the fruit.

Therefore, pruning should be done in time before and after flowering, fertilizer and water management should be strengthened, artificial pollination should be assisted, and the fruit setting rate should be improved.

Watermelon fruits have different shapes, including round, high round, short oval and long oval. Usually, longitudinal growth is the main growth in the early stage, and transverse growth is the main growth in the middle and late stage. In the early stage of fruit development, abnormal fruit often appears when it encounters low temperature, dryness, insufficient light and excessive nutritional growth.