Runoff collecting and nitrogen-phosphorus monitoring system for rice-wheat rotation system

Abstract

The invention relates to a runoff collecting and nitrogen-phosphorus monitoring system for a rice-wheat rotation system. The runoff collecting and nitrogen-phosphorus monitoring system comprises runoff tanks, collecting barrels, runoff pipes and grid covers, wherein water outlets (7) are formed in the bottoms of the runoff tanks; scales are formed on the walls of the runoff tanks to measure runoff volume roughly; a collecting barrel support (6) is arranged at the bottom of each runoff tank, and used for fixing the corresponding collecting barrel collecting runoff water when the runoff volume is relatively low; one end of each runoff pipe (4) is fixed in the runoff tank, and bent downwards to for conveniently collecting the runoff water; the other side of each runoff pipe is arranged in a rice-wheat rotation field; three water inlets are formed in each runoff pipe; each first water inlet is 5-7 cm higher than the rice field, used for collecting the runoff water during a rice season non-drying period, and covered during other periods; each second water inlet is flush with the surface of the rice field, used for collecting the runoff water during a rice planting soil drying period, and covered during other periods; each third water inlet is formed in the bottom of the corresponding runoff pipe, flush with a corresponding ditch bottom formed by ditching in a wheat season, and covered during other periods; the grid covers are arranged at the exteriors of the water inlets of the runoff tanks; the upper ends of the grid covers are opened; pebbles are paved in the grids.

Description

technical field [0001] The invention relates to a runoff collection and nitrogen and phosphorus monitoring system of a rice-wheat rotation system, belonging to the technical field of runoff collection. Background technique [0002] In my country, agricultural non-point source pollution is the main source of pollution in the environment, and its severity is no less than the average level in the world. my country's agricultural level is far behind that of developed countries, and it still mainly relies on the use of chemical fertilizers and pesticides. As a result, the concentration of nutrients such as nitrogen and phosphorus in the field water is much higher than the normal range of surface water. According to statistics, the total phosphorus produced and discharged from agricultural non-point source pollution accounts for 24%-71% of the total pollution load in surface water. The use of pesticides in my country has already reached more than 260 tons, but its utilization ra...

AI Technical Summary

Problems solved by technology

[0003] At present, although domestic and foreign research on farmland runoff mostly focuses on the establishment of runoff ponds, it is not conducive to the collection of runoff when there is little runoff.

Although the application of small runoff buckets solves the problem of collecting runoff when there is little runoff, for farmlands that are flooded all the year round, especially rice fields, the bucket body is easy to float up, resulting in the failure of normal runoff collection.

In addition, there are many aquatic plants such as duckweed and algae in the surface water of the paddy field, and the amount of sediment is also large, which often causes blockage of the nozzle of the runoff pipe, resulting in runoff being unable to flow into the runoff collection device.

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