Planting method of flax in heavy-metal contaminated soil

Abstract

The invention discloses a planting method of flax in heavy-metal contaminated soil. The method comprises the following steps of: A, preparing soil and building a field, and applying passivator to reduce activity of heavy metal in the soil; B, selecting a specific flax variety with strong heavy metal contamination resistance, sowing in enough amount at proper time to guarantee full seedlings; C, rationally and closely planting, intertilling / weeding / topdressing in time to culture effective robust plants; and D, reinforcing prevention and control of diseases and insect pests, harvesting at proper time, and drying in the sun and storing appropriately. By the flax planting method, the average yields of raw stems in light, medium and heavy contaminated soil is respectively 308.2+ / -29.0, 283.2+ / -30.3 and 254.7+ / -28.6kg / mu, which reaches the high-yield level of the flax growing areas in South China; and the content of heavy metal in raw stem coarse fiber can be controlled in a range of related standard limit, so that agricultural safety and effective utilization of heavy metal contaminated soil can be realized. The method is simple in technology and practical, and has wide application prospect in broad heavy metal contaminated areas.

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 flax on heavy metal-polluted soil, 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. What's more serio...

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Problems solved by technology

[0007] Second, the applicant's research results and practice also show that even though some fiber flax varieties have the ability to resist heavy metal pollution, the root development in the early growth stage, especially the seedling stage, is still seriously threatened in heavy metal-polluted areas, and even due to heavy metal "Corrosion" leads to death, resulting in serious dead seedlings and lack of seedlings

[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

The results of years of research and practice by the applicant show that the long-term application of large amounts of physiologically acidic nitrogen fertilizers such as ammonium chloride, ammonium sulfate, and ammonium nitrate and chemically acidic phosphate fertilizers such as superphosphate will directly lead to a decrease in the pH value of the soil. Increase the activity of heavy metals in the soil, increase the absorption and accumulation of heavy metal elements by crops, and affect the quality of agricultural products

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