Law of fertilizer requirement of watermelon

Watermelon needs less fertilizer in the seedling stage, and it will increase gradually when it enters the spreading stage. Nitrogen fertilizer is the main fertilizer, followed by phosphorus and potassium fertilizer. At the flowering stage, watermelons have a great demand for phosphate fertilizer, and the application of phosphate fertilizer at this time will help to grow and improve the fruit setting rate. Watermelon fruiting period is the largest amount of fertilizer in the whole growth process, so we must give sufficient nutrition at this time.

Principles of fertilization for watermelons:

1. Organic fertilizer is given priority to and chemical fertilizer is supplementary. The application of organic fertilizer can not only improve the soil structure and supply comprehensive nutrition, but also increase the sweetness of watermelon and improve the quality of watermelon.

two。 Suitable application of nitrogen fertilizer, heavy application of potassium fertilizer, supplementary application of micro-fertilizer. Nitrogen is an essential element for the growth of watermelon, but too much nitrogen application leads to exuberant stem and leaf growth, stem diameter, leaf hypertrophy, stem and leaf overlap, weakening photosynthesis, imbalance of vegetative growth and reproductive growth, resulting in poor fruit setting and affecting watermelon yield. Potassium is the most needed element in watermelon life. Potassium can promote the transport of photosynthates and improve the yield and quality of watermelon. Therefore, it is more important to apply more potash fertilizer to watermelons.

3. According to the different growth stages and growth of watermelon, soil and climatic conditions, timely and appropriate amount of fertilizer.

In the process of watermelon cultivation, base fertilizer generally accounts for 70% of the total fertilizer application, so base fertilizer must be fully applied before planting, especially in plots where the land fertility is not enough.