In order to make watermelon seedlings grow in a balanced way, we need to keep the soil moist for a long time. Why?

Watermelon, the growth condition is not very good, the seedlings grow slowly, and it has been planted for almost two months. The seedlings are short and there are not many vines. There are only a few leaves on the plant. Some leaves have many holes and are incomplete. There are even some yellow spots with curly edges. This is the disease of watermelon seedlings.

Some melon farmers plant watermelons in early spring in order to better sell watermelons in advance and sell them at a good price. In the case of outdoor planting, the growth of melon seedlings is very vulnerable to weather disasters. In spring, the temperature is generally unstable and there will be continuous rain. For example, in April 2022, it experienced extremely bad temperatures, and the temperature in the northern region dropped below 0 degrees, and even snowflakes and hail floated. Such a low temperature environment is very harmful to melon seedlings. After transplanting watermelon, the growth temperature should not be lower than 10~ 15℃. If the temperature is too low, the soil is wet and cold in rainy days, the sunshine is insufficient, the leaves of watermelon seedlings are limited in growth, the edges are curled, they can't bend and stretch completely, and there are few vines, so the seedlings will be stiff.

Watermelon has a shallow root system, so when choosing planting areas, it is necessary to choose sandy soil. The watermelon with sand pulp that we usually eat is very sweet and grows in that kind of soil natural environment. However, some soils do not have much nutrients, and the roots of melon seedlings can't digest and absorb much nutrients, which is harmful to normal growth. As can be seen from the picture below, the soil layer is white, without any nutrients, stuck together and the soil is not fine enough. Under such conditions, it is difficult for the root system of melon seedlings to contact closely with the soil, and it is difficult to digest and absorb many nutrients, so the root system grows slowly. After digging out the melon seedlings, it can be found that the main roots grow very little and very short, and the roots are pale, which can not digest the nutrients absorbed into the soil, resulting in the slow growth and stiffness of the seedlings.

Because watermelon originated in the tropical desert of Africa, it likes continuous high temperature and is not tolerant of low temperature. When it encounters frost, it will suffer from cold damage. Generally speaking, the suitable temperature for watermelon seeds to germinate is 25-30℃, and it is difficult to germinate within 15℃ or above 40℃. The suitable temperature for the growth and development of root system located above ground is 25-35℃, and the growth stops completely when it is lower than 10℃. In the case of drying, the temperature exceeds 48℃, or in the case of wet and cold gas, the temperature exceeds 52℃, which seriously affects plant growth. Sunburn can occur under continuous high temperature and strong light. Generally speaking, the suitable temperature for flowering is 25℃. The higher the night temperature, the more stamens and the less pistils.