In drip irrigation, a kind of agricultural technology that delivers fertilizer solution to the root zone of the crop evenly with a small flow rate through a dripper, has the advantages of saving water, saving fertilizer, saving labor, quality, and high efficiency. The main points of the drip irrigation and fertilization of tomatoes are described below for reference.

First, drip irrigation device

In the greenhouse, 1 or 2 drip irrigation pipes are laid on each ridge, with the dripper upward and the dripper spacing is about 30 cm. The front end is equipped with differential pressure fertilization tanks or venturis and net filters.

Second, drip irrigation fertilization program

Drip fertilization adheres to the principle of a small number of times. Immediately after planting, drip irrigation was conducted for 1 time, and the amount of water was 20-25 m3/mu in order to ease the seedlings. Seedling and flowering period without irrigation or drip irrigation 1 to 2 times, each irrigation 6 ~ 10 cubic meters / acre, each time fertilizer 3 ~ 5 kg / acre. During the period from fruit enlargement to harvesting, drip irrigation is conducted every 5 to 10 days, each irrigation of 6 to 12 m3/mu, and 4 to 6 kg/mu of fertilizer per time; depending on the growing trend of the tomato, water and fertilizer may be added once. 10 to 15 days before the withdrawal of drip fertigation.

Third, drip irrigation fertilization operation

1. Fertilizer selection. The drip-fertigation requires water solubility at room temperature, does not produce precipitation when mixed with other fertilizers, and is less corrosive to drip irrigation systems. The drip irrigation fertilizer is generally divided into self-made fertilizers and special fertilizers. Self-made fertilizers include urea, potassium nitrate, ammonium nitrate, potassium dihydrogen phosphate, and white powdered potassium chloride. It is recommended to use special fertilizer for drip irrigation, requiring high nutrient content and containing trace elements. The ratio of nitrogen, phosphorus and potassium was about 1.2:0.7:1.1 in the early stage, about 1.1:0.5:1.4 in the middle stage, and about 1:0.3:1.7 in the later stage.

2. Fertilization operation. Fertilizer is first dissolved in water, fully stirred and allowed to stand for a period of time, and then the filtered fertilizer is poured into a fertilizing tank (barrel). Usually after 20 to 30 minutes of irrigation, adding fertilizer, pressure differential fertilization method and fertilizer time is generally 40 to 60 minutes, to prevent uneven or insufficient fertilization.

3. System maintenance. After each fertilization, continue drip irrigation for 20-30 minutes to flush the pipes. After the system has been operating in a growing season, the sewage valve in the lower part of the filter should be opened to clean the filter. After fertigation 3 to 5 times, the end of the drip irrigation tube (band) is opened for flushing.

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