Method for planting ramie in soil seriously contaminated by heavy metal

Abstract

The invention discloses a method for planting ramie in soil seriously contaminated by heavy metal. The method comprises the following steps: A, selecting a specific variety of ramie with high resistance against heavy metal contamination and cultivating strong ramie seedlings by using a young shoot cottage propagation technique; B, constructing a ramie garden and applying a passivator to reduce the activity of heavy metal in the soil; C, transplanting in right time and carrying out rational close planting; D, scientifically carrying out cross dressing and cracking stems in right time; and E, preventing and controlling insect disease prevention in time and strengthening winter cultivation management of the garden. Practical results show that the yields of the newly planted ramie garden in the current year and the next year are respectively 71.8-74.3kg / mu and 84.8-86.3kg / mu, which are basically the same as those of the newly planted ramie garden with clean soil at the same term; moreover, the content of heavy metal in the raw ramie garden can be controlled in a range specified in related standard, and the safe and efficient agricultural utilization of soil seriously contaminated by heavy metal is implemented. The method is simple and convenient in technique and easy to implement and can be popularized to and applied by mass farmers and departments of agricultural technology in areas with serious heavy metal contamination.

Description

technical field [0001] The invention belongs to the technical field of agricultural environment conservation and restoration, and more specifically relates to a method for planting ramie on soil heavily polluted by heavy metals, which is suitable for popularization and application by farmers and agricultural technology departments in areas with severe heavy metal pollution. Background technique [0002] With the continuous advancement of industrialization and urbanization, the problem of heavy metal pollution in my country's soil has been paid more and more attention by people. According to relevant reports, in the early 1980s, the area of ​​cultivated land polluted by heavy metals such as cadmium, lead, mercury, arsenic, chromium, and nickel in my country was only 2.67 million hectares, but it increased to 6.67 million hectares in 1988 and exceeded 1,000 by the end of the last century. million hectares, which has exceeded 20 million hectares, accounting for about 20% of the ...

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Problems solved by technology

[0007] The second is that ramie is a plant with fibrous roots. Even if some specific varieties have the ability to resist heavy heavy metal pollution, the root development is still seriously threatened in the early growth stage of heavy metal pollution areas, and even "corroded" by heavy metals. Death (seedlings) The new root system is especially serious at the early stage), and the sexual reproduction (seed breeding) technology is not suitable for large-scale promotion and application in areas with serious heavy metal pollution (a large number of new root systems die after emergence, resulting in a lack of seedlings / columns in the hemp garden), and cutting The workload of root seeding is too large, the transportation cost is too high and the seed (source) resources are limited

[0009] Fourth, the pH value of the soil is directly related to the activity of heavy metals in the soil, which affects the quality of agricultural products

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