How to solve the problem of watermelon powder in dry weather

the low temperature in the early growth stage of watermelon is the main reason for the lack of pollen. Watermelon likes temperature, is afraid of cold, and dies when it meets frost. The suitable temperature range is 15-35℃, and when it is lower than 1℃, it is easy to suffer from cold damage, which affects flower bud differentiation. The thermal insulation performance of arch shed is poor, and there will be low temperature chilling injury. Some vegetable farmers even have freezing injury when planting watermelons, and the flower buds of watermelons are poorly differentiated. When watermelon is planted, the temperature in some sheds may even be lower than 5℃ at night. Watermelon usually blooms and pollinates in March in early spring, when the temperature is still low. Low temperature during watermelon flowering will directly lead to pollen abortion, resulting in little or no pollen in male flowers. Male flowers suitable for female pollination are mostly carried out when the 3-5 true leaves are unfolded, which is the time for watermelon seedlings to be planted. Therefore, temperature management before and after planting is very important.

poor light before flowering also easily affects pollen formation. Watermelon is the most light-demanding vegetable, with a light saturation point of 8, lux and a light compensation point of 4, lux. Under the condition of low light, the pollen is not well developed. In the case of cloudy days, watermelon has no pollen even if it blooms; On sunny days, watermelon pollen production is good, which directly proves the negative effect of poor light on pollen formation.

Poor nutrition supply caused by overgrowth and root injury can easily lead to poor pollen development. From the field, we can see that the overgrowth of plants has little flowering and less pollen production, which is mainly caused by the excessive growth of nutrients, which makes the nutrition for the growth of flower buds less. Partial application of nitrogen fertilizer and over-wet soil can easily cause watermelon to grow in vain. In order to prevent excessive growth, watermelons are generally not watered before flowering. If the soil is too dry and the root system is injured during flowering, it will also cause pollen dysplasia. Watermelon lacks some nutrients, especially medium and trace elements, which can also cause pollen dysplasia. Such as boron, calcium, etc., have a great influence on pollen development. If it is lacking, pollen development will be affected.