Gravity flow type farmland underground leaching liquor collecting device

Abstract

The present invention discloses a self-flowing farmland underground drenching solution collecting device which belongs to the field for researching the environment science, agrology and plant nutriology. The device of the invention comprises an eluviation disk, a water-discharging pipe, a liquid-collecting pipe, a breathing pipe, a liquid drawing pipe, a sampling bottle, a buffering bottle and a vacuum pump; the eluviation disk is used for collecting the drenching solution; the liquid-collecting pipe is connected to the water outlet of the eluviation disk through the water-discharging pipe, the drenching solution in the eluviation disc can automatically flow into the liquid collecting tube; and the vacuum pump is used for extracting the drenching solution collected by the liquid-collecting pipe to the sampling bottle through the liquid drawing pipe under the buffering of the buffering bottle. Comparing with the prior art the invention has the characters of reasonable structure, convenient manufacturing, easy actualizing and the like, and the invention is especially suitable for monitoring the influence of the soil solutes of nitrogen, phosphor, agriculture chemicals and the like to the groundwater.

Description

technical field [0001] The invention relates to a self-flowing farmland underground drench solution collection device, which belongs to the research fields of environmental science, soil science and plant nutrition. The device is especially suitable for monitoring the impact of leaching of nitrogen, phosphorus, pesticides and other soil solutes on groundwater. Background technique [0002] The pollution of groundwater by nitrogen leaching from soil is not only an important agricultural problem, but also an important problem that threatens human health and survival. Studies have shown that about 30% to 50% of the fertilizers applied to the soil in the world enter the groundwater through soil leaching (Bi Jingwei, Zhang Jiabao, Chen Xiaomin, etc.: "The relationship between soil water leakage and nitrate nitrogen leaching in farmland soil Simulation Research", "Journal of Irrigation and Drainage", 2003, 22[6]). In the past, it was generally believed that the leaching loss of ...

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Problems solved by technology

[0003](1) The indoor soil column simulation method is simple, fast and easy to control, but it cannot accurately reproduce the actual field environment

[0004] (2) The seepage tank method overcomes the shortcomings of the indoor soil column simulation method, but it needs to dig a huge trench for sample collection, which requires a large amount of construction and high cost

Its main disadvantage is that the external pressure changes the soil water flow field, and it is impossible to accurately measure the actual flux of the field leaching solution and the migration process of the actual soil solute.

[0006] (4) The main problem of the clay suction cup method is that only a certain point of soil solution can be collected during sampling. To know the solution status of the entire soil section, multiple collectors need to be inserted, resulting in a substantial increase in cost

[0007](5) The sump method overcomes the shortcomings of the clay suction cup method, but when installing the sump, it is necessary to excavate the soil above the sump, which destroys the soil in the natural state water movement status

[0008] Therefore, in the absence of a standard method for soil leaching monitoring at home and abroad, research on a relatively simple, economical, and accurate self-flowing farmland underground leaching solution collection device will have broad development prospects in the field of soil leaching research.

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