The amount of fertilizer required for melons is very large, especially for potassium. This shows that potassium nutrition is dominant in the cultivation of high yield and good quality vegetables. In addition, the absorption of calcium by vegetables is large, and excessive absorption of potassium and calcium can affect the absorption of magnesium. Therefore, pay attention to the coordination of these three nutrients when fertilizing. With the rapid development of tropical and high-efficient agriculture in Hainan, the growing area of â€‹â€‹various economic crops and vegetables is increasing, and the demand for organic fertilizers is also increasing. However, due to the dependence on chemical fertilizers and the pursuit of short-term benefits, the cultivation of green manure in traditional agricultural farming systems is rare, crop straws have been burned, and the accumulation, stacking, and production of traditional farmyard fertilizers have become less and less. Nutrients such as poultry manure and bullpen fertilizer are not many, and the cost of commodity organic fertilizer is relatively high, thus affecting the input of growers to organic fertilizer. The application of soil testers to the demand for nutrient elements is even more clear.
The amount of organic fertilizer used by most farmers is 10-15 t/hm2. Since winter vegetables are all crops that have a long growing period, high yield, and require large amounts of fertilizer, the soil in Hainan is very thin. Therefore, it is generally required to apply 30-75 t/hm2 of high-quality organic fertilizer as a base fertilizer. It can be seen that there is a large gap in the actual application amount. The use of chemical fertilizers in the production of melons in winter is relatively abundant in our province. However, from the laws of nutrient demand for melons, it appears that nitrogen and phosphorus are abundant and potassium is insufficient. The main reason for this situation is that farmers do not understand the soil nutrient status and the required fertilizer characteristics of vegetables, nor do they know how to properly allocate nutrients to fertilizers sold on the market. Therefore, fertilization has great blindness. Which kind of vegetable is not divided into before, middle and later stages. It only pays attention to applying nitrogen fertilizer or applying compound fertilizer, but neglects the important role of potassium fertilizer. This irrational fertilization method not only raises production costs, but also causes undesirable consequences.
Through the soil tester's determination of soil nutrients, there is a more scientific basis for the control of the amount of fertilizer applied during the cultivation of the vegetables. Hainan has rich winter water and heat resources and is suitable for the development of counter-season melons. However, due to the thin soil and predatory operations, it has severely restricted the sustainable development of melon vegetable production. Therefore, it is imperative to popularize scientific fertilization based on fertility.
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