Method for reducing farmland drainage canal nitrogen and phosphorus loss through charcoal

A technology of farmland drainage and biochar, which is applied in the field of agricultural non-point source pollution control, can solve problems such as poor drainage, reduced effect of ecological ditch reduction, and waterlogging of farmland, and achieve the effect of maintaining smooth water flow, easy implementation, and simple operation

Inactive Publication Date: 2016-06-29
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high groundwater level in the plains of the Pearl River Delta, waterlogging problems often occur in the farmland during the rainy season. If the aquatic plants are directly planted in the ditch, the aquatic plants will often cover the entire ditch after a period of growth.
However, if the aquatic plants grow too densely in the ditches, it is easy to cause poor drainage and aggravate the problem of farmland waterlogging
Moreover, with the passage of time, nitrogen and phosphorus in the bottom sediment of the ditch continue to accumulate, and the reduction effect of the ecological ditch on nitrogen and phosphorus is also greatly reduced.

Method used

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  • Method for reducing farmland drainage canal nitrogen and phosphorus loss through charcoal
  • Method for reducing farmland drainage canal nitrogen and phosphorus loss through charcoal
  • Method for reducing farmland drainage canal nitrogen and phosphorus loss through charcoal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A farmland drainage ditch was randomly selected in a vegetable field in the suburbs of Guangzhou, and a biochar matrix frame system was constructed according to the following steps.

[0040] S1. Set the matrix frame, see figure 1 As shown, the width of the matrix frame is controlled at 3 / 4 or less of the width of the farmland drainage ditch, and holes are provided in the matrix frame to facilitate the normal flow of ditch water;

[0041] S2. Spread a layer of fine gravel at the bottom of the matrix frame, and then fill in a mixed matrix composed of soil matrix and biochar;

[0042] S3. Transplanting aquatic plant seedlings in the mixed substrate;

[0043] S4. The matrix frame is placed in the farmland drainage ditch, and the matrix frame is kept a certain width away from both sides of the ditch.

[0044] Specifically, in this embodiment, the width of the farmland drainage ditch is 0.8-1.2 m, and the average width is 1.0 m. Prepare plastic frames with length (m), widt...

Embodiment 2

[0046] Refer to Example 1 for the implementation steps. The implementation test was carried out in August 2015, and the specific implementation method is the same as above.

[0047] The indoor simulated soil column leaching test method was used to test the effect of biochar on the loss of soil nitrogen and phosphorus. The proportions of biochar added to the soil were 2%, 4%, 6% and 8%, respectively, and no addition treatment was set. For comparison, see Figure 4 and Figure 5 shown ( Figure 4 and Figure 5 Numbers 1 to 10 in the middle right column indicate the number of water leaching times in the test). The test results showed that there was a significant difference between the biochar treatment and the control (p<0.05), the greater the amount of biochar added, the smaller the leaching loss of soil TN and TP. Therefore, biochar can effectively reduce the leaching loss of soil TN and TP.

[0048] The method of indoor hydroponic experiment was adopted to test the reduc...

Embodiment 3

[0051] The implementation test was implemented in April, 2015, and the specific implementation method was the same as above, and the effect of reducing nitrogen and phosphorus with biochar and aquatic plants for the test implementation was the same as in Example 1. In order to test the implementation effect of the technology of the present invention, sampling sections were respectively set at the upstream (before the iris) and the downstream end (behind the barracuda) of the ecological ditch constructed by the technology of the present invention, and the changes in nitrogen and phosphorus concentrations were continuously sampled and monitored after a rainfall. Another 50m farmland natural drainage ditch (with weeds growing naturally on both sides of the ditch) was selected as a control for monitoring over the same period. The results are shown in Table 1. The results in Table 1 show that the average removal rate of TN and TP after one rainfall in the ecological ditch constructe...

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Abstract

The invention discloses a method for reducing farmland drainage canal nitrogen and phosphorus loss through charcoal.By means of the high adsorbability of charcoal for nitrogen and phosphorus, aquatic plants are planted in a soil matrix containing charcoal and placed in a farmland drainage canal in a frame mode, and therefore the distribution layout of aquatic plants in the ecological canal is controlled; by means of the absorption and adsorption effect of the aquatic plants and the charcoal in the soil matrix on nitrogen and phosphorus on canal water, the nitrogen and phosphorus concentration in the canal water is lowered, the purpose of reducing the nitrogen and phosphorus loss is achieved, the aquatic plants in the canal can be prevented from growing too densely, and therefore the smooth waterflow in the canal is ensured.The method is low in investment cost, and easy to operate and implement.

Description

technical field [0001] The invention relates to the field of agricultural non-point source pollution control, in particular to a method for reducing nitrogen and phosphorus loss in farmland drainage ditches by using biochar. Background technique [0002] The fertile land in the Pearl River Delta Plain is an important agricultural product production base in Guangdong Province. Farmland drainage ditches are densely distributed in the area. Under the conditions of high land replanting index and frequent short-duration rainstorms, soil nitrogen and phosphorus are easily lost with farmland drainage. Entering the river gushing water body, causing eutrophication of the water body. Studies have shown that the use of aquatic plants to construct ecological ditches can significantly reduce the concentration of nitrogen and phosphorus in the ditch water. However, due to the high groundwater level in the plains of the Pearl River Delta, waterlogging problems often occur in farmland duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G1/00A01B79/00A01B79/02
CPCA01B79/00A01B79/02A01G22/00
Inventor 卓慕宁李定强谢真越韦高玲
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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