Method for monitoring nitrogen and phosphorous leaching loss of paddy soil under fertilizing condition

Abstract

The invention discloses a method for monitoring nitrogen and phosphorous leaching loss of paddy soil under a fertilizing condition. The method includes the following steps: A, selecting an experimental field, namely selecting paddy soil for measuring; B, arranging small areas, namely setting the number of the small areas according to experiment processing number and repeating number; C, constructing the small areas; D, mounting seepage pipes, namely monitoring nitrogen and phosphorous leaching loss conditions of percolate at different depths; E, fertilizing the small areas, namely mixing fertilizer with soil after the field experimental small areas are built; F, raising and planting seedlings, namely selecting rice varieties and enabling planting space and number of each small area to be identical; G, irrigating the small areas, namely opening small grooves between the small areas and main grooves during irrigating of the small areas and watering towards the small areas; H, intertilling and weeding; I, preventing and controlling plant diseases and insect pests; J, harvesting paddy rice; K, sampling the percolate; L, testing nitrogen and phosphorous of the percolate, namely testing total nitrogen, nitrate nitrogen, ammonia nitrogen, total phosphorous and inorganic phosphorous in the percolate. The method is high in accuracy, high in operability, high in practicability and suitable for realtime testing of nitrogen and phosphorous leaching loss of the paddy soil of various types.

Description

technical field [0001] The invention relates to the technical field of agricultural non-point source pollution, and more particularly relates to a monitoring method for nitrogen and phosphorus leaching in paddy field soil under fertilization conditions, which is suitable for real-time monitoring of nitrogen and phosphorus leaching in various types of paddy field soil. Background technique [0002] With the improper increase of agricultural production's dependence on fertilizers, long-term fertilization and excessive fertilization cause soil nitrogen and phosphorus loss to cause agricultural non-point source pollution. The loss of nitrogen and phosphorus in farmland soil includes two ways, surface runoff and underground leaching. The loss of nitrogen and phosphorus in farmland along with surface runoff is easy to monitor by sampling, but the real-time sampling and monitoring of nitrogen and phosphorus loss caused by underground leaching is more cumbersome, especially because ...

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Problems solved by technology

The problem with this method is that the clay pipe is easily blocked by the soil colloid and the connection between the plastic pipe and the sand pipe is easy to fall off, so that the groundwater cannot be pumped out; It is free water, which affects the reliability of the measurement results; at the same time, the price of the clay tube used in this method is high, and in addition, the price of the air pump that needs to draw negative pressure is also relatively expensive

However, the problems in these methods are that first, it is necessary to use a suction pump or a negative pressure gauge to extract groundwater samples, which not only has high equipment costs, but also is cumbersome to operate. Second, when the plastic sampling tube is buried, the soil structure around the sampling tube is likely to be damaged, which affects the actual seepage of the normal seepage. In addition, some sampling tubes are sealed at the bottom and placed in paddy field soil to collect leachate. It is easy to make the leachate deteriorate and smell, which will affect the determination of nitrogen and phosphorus in the solution; there is also the fact that the upper end of the sampling tube is not covered, which will easily cause rainwater to enter the sampling tube, which also affects the determination of the concentration of nitrogen and phosphorus in the leachate

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