Method for planting ramie in middle-level heavy metal contaminated soils

Abstract

The invention discloses a method for planting ramie in middle-level heavy metal contaminated soils. 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 soils; 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 75.1-78.4kg/mu and 88.8-91.7kg/mu which are the same as or even higher than those of the newly planted ramie garden with clean soils at the same term; moreover, the heavy metal content of raw ramie can be controlled in a range specified in related standard, and the safe and efficient agricultural utilization of middle-level heavy metal contaminated soils is realized. The method is simple and convenient in technique and easy to implement; moreover, the effect of the method is even higher if applied to the mild heavy metal contaminated soils. The method has a broad application prospect in mass areas with heavy metal contaminated soils.

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 moderately polluted by heavy metals, which is suitable for popularization by farmers and agricultural technology departments in heavy metal polluted areas. 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 total arable land area. W...

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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 metal pollution, in the early growth stage of heavy metal polluted areas, the root development is still seriously threatened, and even "corroded" by heavy metals. new root system is particularly serious), sexual reproduction (i.e. seed breeding) technology is not suitable for large-scale promotion and application in areas polluted by heavy metals (a large number of new root systems die after emergence, resulting in a lack of seedlings / lack of a lot of hemp gardens), and root cutting sowing The workload is too large, the transportation cost is too high and the species (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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