Farmland soil nitrogen and phosphorus loss biochar interception and reuse system and method

A biochar and farmland runoff technology, applied in the field of soil non-point source pollution control research, can solve problems such as the reduction of nitrogen and phosphorus utilization, and achieve the effects of increasing retention, reducing loss and improving utilization.

Pending Publication Date: 2020-11-24
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this biological buffer zone method can better intercept the nitrogen and phosphorus lost from the farmland soil, it is difficult to reuse the intercepted nitrogen and phosphorus in the farmland, and it still cannot solve the problem of nitrogen and phosphorus utilization caused by the loss of farmland nitrogen and phosphorus fertilizers. rate reduction problem

Method used

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  • Farmland soil nitrogen and phosphorus loss biochar interception and reuse system and method
  • Farmland soil nitrogen and phosphorus loss biochar interception and reuse system and method
  • Farmland soil nitrogen and phosphorus loss biochar interception and reuse system and method

Examples

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Effect test

Embodiment 1

[0038] A biochar interception and reuse system for farmland soil nitrogen and phosphorus loss, which includes: farmland 1, farmland runoff biochar interception zone 2, recycled biochar 3; farmland runoff biochar interception The belt is the main functional part of the system. It is located 0.8 meters behind the main runoff direction of the farmland where nitrogen and phosphorus biochar fertilizers are applied. The recycled biochar is filled in the farmland runoff biochar retention zone, and it can be passed after measuring the nitrogen and phosphorus content. Re-loading nitrogen and phosphorus for reuse, the biochar fertilizer that enters the farmland 1 where the nitrogen and phosphorus-loaded biochar fertilizer is applied constitutes the entire interception and reuse system.

Embodiment 2

[0040] The method of interception and reuse of the biochar interception and reuse system for nitrogen and phosphorus loss in farmland soil is as follows:

[0041] (1) Farmland applied with nitrogen and phosphorus biochar fertilizer: the applied biochar is prepared by soaking the nutshell biochar with a particle diameter of 2mm in a 1:2 high concentration mixed potassium dihydrogen phosphate according to a solid-liquid ratio of 1:20 And potassium nitrate solution, each liter of solution contains 100gKH 2 PO 4 And 200g KNO 3 After mixing, let it stand for 24 hours. Collect the impregnated biochar with a screen and dry it in an oven at 50°C for 3 days. Use 0.5M sodium bicarbonate and 1M sodium chloride solutions to make a solid-liquid ratio of 1:20. The content of phosphorus and nitrate nitrogen in biochar was 8.3% and 7.3% after leaching biochar; the excess potassium dihydrogen phosphate and potassium nitrate in the soaking biochar solution can be used repeatedly. The application r...

Embodiment 3

[0045] Application example of biochar interception and reuse system of soil nitrogen and phosphorus loss from corn planting farmland in Baiyangdian District

[0046] Preparation and application of biochar fertilizer: The purchased fruit shell biochar with a particle size of 2mm is soaked in a 1:2 high concentration (close to saturation) mixed potassium dihydrogen phosphate and potassium nitrate solution according to a solid-to-liquid ratio of 1:20. After homogenization, let it stand for 24 hours. Collect the impregnated biochar with a screen, and then dry it in an oven (Shanghai Boxun GZX-9076MBE) at 50°C for 3 days. Using 0.5M sodium bicarbonate and 1M sodium chloride solution to extract biochar with a solid-to-liquid ratio of 1:20, the content of phosphorus and nitrate nitrogen in the biochar was 8.3% and 7.3%, and the total was greater than 15%. The demand for nitrogen and phosphorus per acre of corn planting is about 5kg nitrogen and 5kg phosphorus, that is, the annual bioch...

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Abstract

The invention relates to a farmland soil nitrogen and phosphorus loss biochar interception and reuse system and method. The system comprises three links of application of nitrogen and phosphorus loaded biochar fertilizer to a farmland, a biochar interception zone of farmland runoff and reapplication of biochar in the interception zone to the farmland. Biochar is used for loading nitrogen and phosphorus and can serve as an improver to be applied to soil, so that control and recycling of farmland nitrogen and phosphorus non-point source loss are achieved. The system is simple in structure, easyand convenient to operate, high in practicability and low in cost, intercepted nitrogen and phosphorus nutrient elements are recycled while the soil nitrogen and phosphorus non-point source loss is controlled, and the soil quality is improved.

Description

Technical field [0001] The invention belongs to the research field of soil non-point source pollution control, and relates to farmland nitrogen and phosphorus loss control and nitrogen and phosphorus recycling system, in particular to a farmland soil nitrogen and phosphorus loss biochar interception and reuse system and method. Background technique [0002] The application of nitrogen and phosphorus fertilizers in farmland significantly increases the yield of farmland crops and ensures the huge demand for food in my country. At the same time, its excessive application will also significantly increase the risk of nitrogen and phosphorus loss in farmland soil, causing secondary environmental problems such as eutrophication of surrounding water bodies. . According to statistics, in 2011, the total amount of soil phosphorus runoff loss from farmland in my country was 63,700 tons, and the total amount of soil nitrogen runoff loss and total leaching loss were 2,365,400 tons and 1,797,4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C02F1/28A01G22/00A01G22/20C02F101/10C02F101/16
CPCA01G22/00A01G22/20C02F1/283C02F2101/105C02F2101/16C02F2103/001C05B7/00C05C5/02C05D9/00
Inventor 卢学强李海笑李玉鑫刘玉海
Owner NANKAI UNIV
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