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Management and Application of Subsurface Drip Irrigation

Release Date:

2019-12-27

(1) Selection of drip irrigation laterals. For row-sown, densely planted crops such as vegetables, the root system has a limited distribution and is highly sensitive to water and nutrient supply, necessitating a high emitter spacing and a greater quantity of laterals. Therefore, using lower-cost drip irrigation tape as the lateral can effectively reduce the overall cost of the drip irrigation system while ensuring reliable operation and convenient installation and use.

( 1) Selection of drip irrigation laterals. For row-sown, densely planted crops such as vegetables, the root system has a limited distribution and is highly sensitive to water and nutrient supply, necessitating a high emitter spacing and a greater quantity of laterals. Therefore, using lower-cost drip irrigation tapes as laterals can effectively reduce the overall cost of the drip irrigation system while ensuring reliable operation and convenient installation and use.

(2) Subsurface drip irrigation layout. Before drip irrigation is introduced into the greenhouse, ridges should be formed along the span (or length) of the greenhouse, with a ridge width of 40 centimeters, tall 10-15 Centimeters, forming double high ridges with a lower center; drip irrigation tape is laid in the central depression of the double high ridges, and the ridges are covered with plastic mulch. The center-to-center spacing of the double high ridges is generally 1 rice; therefore, the spacing for the drip irrigation laterals is 1 m. The length of each drip irrigation laterals is generally equal to the width (or length) of the greenhouse; for vegetables with high water requirements, two sets of laterals are sometimes installed. The lateral pipes are typically laid along the rear wall of the greenhouse (or parallel to the span of the greenhouse), with their length matching the greenhouse’s length (or span). At the head of each lateral, fertilizer application devices and secondary mesh filters are installed.

　　( 3) Benefits of drip irrigation for vegetables. Under-film drip irrigation in greenhouses and plastic tunnels generally uses less water than flood irrigation. 70% This method can significantly reduce humidity inside the greenhouse, thereby decreasing the incidence of diseases and pests and improving vegetable quality; it also maintains higher greenhouse temperatures than conventional flood irrigation, allowing fresh vegetables to be brought to market up to two weeks earlier. Subsurface drip irrigation in greenhouse cultivation can further increase vegetable yields. 20%-40% , the payback period is generally 4-6 months.

　　3. Subsurface drip irrigation management of

　　( 1) Standardized operation. To achieve optimal results with vegetable drip irrigation, design, installation, and management must be carried out in accordance with standardized procedures; filtration equipment must not be removed at will, nor should holes be drilled arbitrarily at any location.

　　( 2) Pay attention to filtration. For drip irrigation under plastic mulch in greenhouse facilities, regularly clean the mesh screens inside the filters; replace any damaged screens immediately, and promptly open the end caps to flush out sediment and silt from the drip irrigation piping network.

( 3) Apply an appropriate amount of irrigation. The duration of each drip irrigation session should be determined based on the degree of water deficit and the vegetable variety, generally kept within 1-4 hour

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