Method for planting kenaf on heavy metal contaminated soil

Abstract

The invention discloses a method for planting kenaf on heavy metal contaminated soil. The method includes the following steps: A, preparing the land and building an area, and applying an passivant to reduce the activity of soil heavy metal; B, selecting a specific kenaf variety with high heavy metal pollution resistant capacity, sowing sufficiently in due time, and guaranteeing a full stand through one sawing; C, determining suitable close planting, performing thinning and final singling in due time, and reserving basic seedlings; D, intertilling and weeding timely, topdressing and irrigating reasonably, and cultivating effective strong plants; and E, strengthening pest control and achieving high yield of the kenaf. The original kenaf outputs of mild, moderate and serious contaminated kenaf gardens are 276.2+ / -25.5, 247.6+ / -23.4 and 220.9+ / -21.2kg / mu respectively when the method is used for planting the kenaf, the high yield level in southern kenaf areas in our country is reached, content of heavy metal in the original kenaf can be controlled within a relative standard limit, agricultural safety and efficient utilization of the heavy metal contaminated soil are achieved, the technique is simple and convenient, the method is easy to implement, and an extremely wide application prospect is provided in vast 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 kenaf 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 seri...

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Problems solved by technology

[0007] Second, the applicant's research results and practice also show that even if some varieties have the ability to resist heavy metal pollution, the root system development in the early growth stage of the heavy metal polluted area, especially the seedling stage, is still seriously threatened, and even due to heavy metal "corrosion" leading to death and serious shortage 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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