Open hole fertilization is to dig an open hole in the middle ridge of two vegetables. The hole is in the inner side of the irrigation ditch, and the gap is opened 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 some irrigation can flow into the hole to dissolve And spread the fertilizer; after covering the film, tear the film out of a hole above the hole; apply the fertilizer into the hole 1 to 2 days before each irrigation; make a hole and use the whole growing period of the vegetable. Open-point fertilization reduces the number of digging holes and soil covering procedures compared with conventional points; it overcomes the disadvantages of low fertility, low fertilizer supply, and fertilizer utilization. Under the easier agricultural operation, concentrated fertilization was achieved and fertilizer efficiency was improved.

one. Open-pit setting: vegetables with large plant spacings such as eggplant, tomato, and pepper, generally more than 45 cm away from each other, can have an open hole in the middle of each vegetable; cucumbers, loofahs and other vegetables with a small spacing, generally 25 cm or so, Large and small plant spacings of 30 cm and small plant spacings of 20 cm can be used. The open space is set in the middle of large plant spacing.

The basal fertilizer fertilized in the open hole is in accordance with the current conventional basal fertilizer application rate; farming operations such as ploughing, ridging, and transplanting vegetables are performed according to the conventional method; after the vegetative seedlings are covered, the ridges between the two vegetables and vegetables are dug on the ridges between the two vegetables and vegetables. An open hole, an open hole near the inner side of the irrigation ditch, and open to the side of the irrigation ditch, the bottom of the open hole is about 5 cm higher than the ditch of the irrigation ditch; after the ground covers the mulch, the mulch tears a hole above the open hole. The size of the hole is convenient for the degree of fertilization within the hole; the autumn delay of the tomato is generally not covered by a film and can be directly applied to the open hole.

two. Fertilizer types: Fertilizers for open-face fertilization are mainly compound fertilizers, and compound fertilizers containing nitrate nitrogen and sulfur, high nitrogen and potassium, and water-soluble compounds are preferred.

three. Fertilizer amount: Fertilizer amount is about 12.5 kg compound fertilizer per acre in autumn and winter (October to the end of February), about 25 kg compound fertilizer per acre in spring (March to May), and the amount of open hole fertilizer may also be for farmers. 50 to 60% of the fertilizing amount.

four. Fertilization time: Fertilizer is applied 1 to 2 days before watering. The number of times of watering and the amount of watering are according to the farmers' habits.

Fives. The simple tool for fertilizing: open-point fertilization can be used to make simple tools. It can be rolled into a horn tube with iron sheet, hard plastic or hard paper, and it can be used as a fat leaker to increase the speed of fertilization.

six. Appropriate area: This technology is suitable for Shandong Province and Northern China.

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