Open hole fertilization is to dig an open hole in the middle of the two vegetables, the hole is inside the irrigation ditch, open the gap to the inside of the ditch, the gap is lower than the ditch irrigation level but higher than the bottom of the ditch, so that part of the irrigation can flow into the hole to dissolve And diffusing fertilizer; after covering the mulch, the mulch is torn out of a hole above the hole; 1 to 2 days before each irrigation, the fertilizer is applied into the hole; once acupoint, the whole vegetable is used during the growth period. Open hole fertilization reduces the process of digging and covering soil each time compared with conventional point fertilization; it overcomes the shortcomings of low fertilizer fertilization intensity and fertilizer utilization rate. Under the easier farming operation, concentrated fertilization was realized and the fertilizer efficiency was improved.
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Open hole fertilization technology for vegetables in solar greenhouse
   　 Technical points:
1 . The setting of open hole: eggplant, tomato and pepper, etc., with a large plant spacing, the plant spacing is more than 45 cm, and an open hole can be set in the middle of each vegetable; cucumber, loofah and other vegetables with a small plant spacing are generally about 25 cm apart. The method of large and small plant spacing can be adopted, the large plant spacing is 30 cm, the small plant spacing is 20 cm, and the open hole is set in the middle of the large plant spacing.
   　 The base fertilizer for open hole fertilization is in accordance with the current conventional base fertilizer application; the farming operations such as tillage, ridge and transplanting vegetables are conventional; after the vegetable is slowed down, before the mulch is covered, the ridge between the two vegetables and vegetables is dug. An open hole, the open hole is close to the inner side of the irrigation ditch, and is open to the side of the irrigation ditch. The bottom of the open hole is about 5 cm higher than the bottom of the ditching ditch; after the ground covers the mulch, the ground film is torn open a hole above the open hole. The size of the hole is convenient for fertilization into the hole; in autumn, the tomato is delayed, generally no film is applied, and the fertilizer can be directly applied to the open hole.
2 . Types of fertilizer: The fertilizer for open-point fertilization is mainly compound fertilizer, and it is better to use compound fertilizer containing nitrate nitrogen and sulfur, high nitrogen and potassium, and good water solubility.
3 . Fertilization amount: Fertilization amount in autumn and winter (from October to the end of February), about 12.5 kg per mu, and about 25 kg per mu in spring (from March to May); 50 to 60% of the amount of fertilizer applied.
4 . Fertilization time: Fertilizer is applied 1 to 2 days before watering. The number of watering and the amount of watering are based on farmers' habits.
5. A simple tool for fertilization: open-point fertilization can be made with simple tools. It can be rolled into a horn with iron, hard plastic or hard paper to make a fertilizer leak, which can increase the speed of fertilization.
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Armored doors are made of sturdy steel structures (called armor systems) in the middle of the door leaf,
The double-sided surface is covered with different solid materials for decoration.
Armored doors originated in Europe, and their main feature is their armor system (the middle of the door leaf)
Using a sturdy inner liner structure, and then using different surface coverings for decoration
The entire door can adapt to any decoration style; The materials that can be used on the surface are:,