Drip-fed fertilization refers to an agricultural technology in which the fertilized liquid is injected into drip irrigation by means of a fertilizing device under the condition of pressurized water source, and the fertilizer liquid is evenly transported to the root zone of the crop through a dripper with a small flow rate, which has water-saving and fertilizer-saving. , saving medicine and labor, quality and efficiency.
1. Drip irrigation and fertilization device
In the solar greenhouse, one or two drip irrigation pipes are laid per ridge, the dripper is upward, and the distance between the drip heads is about 30 cm. The first installation is a differential pressure fertiliser tank or a venturi fertiliser, and a mesh filter is installed at the rear end.
Second, drip fertigation program
Drip irrigation and fertilization adhere to a small number of principles. After planting, timely drip irrigation 20-25 square meters per mu to ease seedlings. In the seedling stage and flowering stage, no irrigation or drip irrigation is carried out 1-2 times, each irrigation is 6-10 square meters / mu, and each time adding fertilizer 3-5 kg / mu. During the fruit expansion period to the harvesting period, every 5-10 days of drip irrigation, each irrigation 6-12 square meters / acre, each fertilizer 4-6 kg / acre; depending on the growth of the tomato, you can stop adding fertilizer at a certain drip irrigation once. Stop drip fertilization 10-15 days before pulling .
Third, drip fertigation operation
　　 1. Fertilizer selection: The drip irrigation fertilizer is required to be soluble in water at normal temperature, and does not precipitate with other fertilizers, and is less corrosive to the drip irrigation system. Drip fertilizer is generally divided into homemade fertilizer and special fertilizer. The homemade fertilizer can be urea, potassium nitrate, ammonium nitrate, industrial or food grade monoammonium phosphate, potassium dihydrogen phosphate, white powdered potassium chloride and the like. It is recommended to use the special fertilizer for drip irrigation recommended by the relevant department. The nutrient content is required to be high, containing medium and trace elements; the ratio of nitrogen : phosphorus : potassium is about 1.2:0.7:1.1 in the early stage , about 1.1:0.5:1.4 in the medium term , and about 1:0.3:1.7 in the later stage .
　　 2 , fertilization operation: first dissolve the fertilizer in water, stir well and let stand for a while, then pour the filtered fertilizer into the fertilization tank (barrel). Generally , the fertilizer is added after 20-30 minutes of watering . The differential pressure fertilization method generally takes 40-60 minutes to prevent uneven or insufficient fertilization.
　　 3 , system maintenance: continue to drip irrigation for 20-30 minutes after each fertilization to flush the pipeline. After the system is running for one growing season, the drain valve at the lower part of the filter should be opened to clean the filter. After the drip fertigation 3-5 times, to a drip tube (tape) end opened for flushing.
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