Although the watermelon's fertilizer requirement is relatively large, its own root system is relatively fragile, and the root system is likely to burn out due to excessive fertility. The whole growth process of watermelon from seedling to maturity has varying degrees of absorption of various fertilizers. It can be divided into the following growth stages according to the different needs of fertilizers in different periods:
The law of watermelon absorbing fertilizer
1. Seedling stage
At this stage, the watermelon absorbs less fertilizer and only accounts for a very small part of the total.
2. Extension period
At this stage, the absorption of fertilizer by watermelon has been greatly improved compared to the seedling stage, accounting for about one tenth of the total fertilizer. The fertilizer should be mainly nitrogen fertilizer, supplemented with phosphorus and potassium fertilizer.
3. Flowering period
At this stage, the demand for phosphate fertilizer in watermelon is relatively large. A certain amount of phosphate fertilizer is helpful to promote reproductive growth, prevent the weakening of vine leaves, and increase the fruit setting rate.
4. Fruiting period
During the period from fruit bleaching to the later stage of expansion, watermelon plants have the highest absorption of substances and nutrients, and the accumulation of dry matter occupies about 70% of the total, the absorption of nitrogen reaches 68%, and the absorption of phosphorus It reached 64%, and the absorption of potassium reached 66%. When the watermelon swelled to maturity, the absorption of fertilizer began to decline again.
In general, the absorption of nutrients in watermelon is less in the early stage, more in the middle and later stages, and less in the final stage. The absorption of large amounts of elements in the whole growth period of watermelon is potassium, nitrogen is the second, phosphorus is the least.
The critical period of nitrogen and phosphorus nutrition for watermelon is at seedling stage, the critical period for potassium nutrition is at vine extension stage, and the maximum nutritional efficiency period for watermelon is at melon stage.
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