The principles of application of organic fertilizers and chemical fertilizers cannot be reversed. The principle of applying fertilizers is organic fertilizers, supplemented by chemical fertilizers, and cannot be reversed. Only in this way can the high-quality and high-yield vegetables be free from pollution. Organic fertilizer must be fully cooked. Incompletely decomposed organic fertilizers such as chicken manure contain a large amount of salts and pests, and human and financial resources are required to control pests after application. In addition, the application of chemical fertilizers should be avoided and they should be formulated according to the needs of different vegetables.

The application amount of phosphorus and potassium cannot be reversed in the growth process of melons and solanaceous vegetables. Nitrogen is the key to plant formation. Phosphorus and potassium are the main elements of fruit formation. According to relevant information, the ratio of phosphorus and potassium in the forming elements of melons and solanaceous vegetables is 1:2 to 1:3, and the utilization rates are 20% to 30% and 50% to 70%, respectively. Therefore, in the fertilization process, we must pay attention to the application of more potassium fertilizer, reasonable with the application of nitrogen fertilizer, phosphate fertilizer, which is particularly important after fruit set. Partial application of diammonium phosphate must be avoided. And it is necessary to use bio-fertilizer rationally to regulate nutrient supply.

The order of pest control, nutrition regulation and watering cannot be reversed. If the watering is first, and the control of pests and diseases is followed by nutrient regulation, on the one hand nutrient overgrowth, lack of reproductive growth, lighter internodes, thin leaves, fine stalks Severe falls are serious. On the other hand, due to the increased humidity in the shed after watering, diseases such as Phytophthora, Pythium, Downy Mildew, etc. will be accelerated and the disease will be aggravated. Therefore, we must first use drugs to prevent diseases and pests, and then use inhibitors to regulate the growth of plants, and then watering and fertilizing. Only in this way can we avoid self-contradictory problems, in order to increase production.

The sequence of watering and stumping and transplanting colonization cannot be reversed in some areas. There have been mistakes in the establishment of watering stumbling and transplanting seedlings, resulting in dead seedlings. Many vegetable growers generally spread organic fertilizers and chemical fertilizers in the sheds first, and then plough them. After flattening, the ridges are planted and the vegetable seedlings are planted and watered after planting. This process makes the roots of the vegetable seedlings lose water, and it is easy to contact with fertilizers to cause burning of roots, or to cause ammonia poisoning. Water is used to make oysters, and after seedlings are transplanted, it is not easy for the fertilizer to be dissolved and diluted by water to cause burning of roots, and it is not easy to produce gas damage. Therefore, water should be used to make oysters, then planting seedlings, and then using fertilizer solution to irrigate the roots. You can irrigate once every 7 to 10 days, and even irrigate 3 to 4 times.

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