Draining and salt-removing method for newly-ploughed salinized farmland
A farmland and water pipe technology, applied in soil drainage, agriculture, soil lifting machinery, etc., can solve the problems of inability to ensure drainage, easy collapse and silting, and high soil salinity, so as to improve land utilization and avoid large investment. , the effect of expanding the scope of application
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Embodiment 1
[0019] Concealed pipe material selection: use 100 mm PVC plastic sewer pipe, and uniformly punch small holes with a diameter of about 3 mm on the pipe wall, with a punching rate of 75%, wrap two to three layers with coarse chemical fiber materials, and bind them with plastic ropes.
[0020] The specific steps of the drainage and salt discharge method of salinized farmland:
[0021] 1. Digging trenches
[0022] Use an excavator to dig a ditch with a depth of 1.5 to 2.0 meters, a width of 30 cm at the bottom of the ditch, and a slope of 1:0.5. After the ditch is dug, the bottom of the ditch should be rested immediately, and the slope should be well controlled by leveling.
[0023] 2. Laying
[0024] Lay 40 cm wide plastic woven cloth at the bottom of the ditch to prevent gravel from mixing with mud, and lay 15 cm thick gravel on top, preferably with more coarse sand, and lay wrapped hidden pipes. The upper part is spread with 15-20 cm thick gravel, and then 40 cm wide plastic...
Embodiment 2
[0032] Adopt the drainage and salt discharge method of salinized farmland provided by the present invention, through the application in the paddy field, use the excavator to dig trenches, lay, and design the outlet of the hidden pipe and the distance between the hidden pipes, so as to detect the application effect of the present invention. For details, see Table 1.
[0033] It can be seen from Table 1 that when the rice began to be irrigated in May, the displacement of the two underground pipes gradually increased, while the salinity of the discharged groundwater gradually decreased. Start without water. The annual displacement of the 2-meter-deep underground pipe is 44267.1 cubic meters, and the salt discharge capacity is 214.1 tons. The annual displacement of the 1.5-meter-deep underground pipe is 20,689.5 cubic meters. Due to the low-lying terrain and high groundwater salinity, the annual salt discharge is 256.1 tons.
[0034] Generally, the salinity of farmland irrigatio...
Embodiment 3
[0036] Using the method for drainage and salt removal of salinized farmland provided by the invention, the effect of the method for drainage of underground pipes provided by the invention on reducing soil salinity is verified.
[0037] See Table 2. Through the monitoring and analysis of soil salt content at different levels (0-200cm) at 10, 20, 30, 40, and 50 meters on the east and west sides of the hidden pipe, it is found that drainage and salt discharge of the 2-meter-deep buried pipe have a great effect on reducing soil salinity. The obvious range of influence is about 30 meters to the east and 50 meters to the west of the hidden pipe. The 0-100cm soil salt content within 30 meters to the east of the hidden pipe decreased by an average of 21.8%, and the 0-200cm soil salt content decreased by an average of 38.1%; the 0-100cm soil salt content within 50 meters to the west of the dark pipe decreased by an average of 30.2%, 0 -200cm soil salt content decreased by 40.5% on aver...
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