Crop rotation method capable of reducing content of cadmium in leaf vegetables

Abstract

The invention discloses a crop rotation method capable of reducing content of cadmium in leaf vegetables. According to the crop rotation method, aquatic leaf vegetables and dry-farmed leaf vegetables are cultured in a paddy-upland rotation manner in a cadmium overproof vegetable field with pH of smaller than 7. The crop rotation method particularly comprises the following steps: (1) planting the first batch of aquatic leaf vegetables in a manner of waterflooding in the whole growth period; (2) after the aquatic leaf vegetables are harvested and when the wetness of the soil is suitable, planting the dry-farmed low-Cd-accomulation leaf vegetables and spraying water during the growth period of the leaf vegetables according to the growth requirements of the leaf vegetables; (3) after the dry-farmed leaf vegetables are harvested, repeating the step (1) and the step (2) and so on; (4) during the growth period of the leaf vegetables, carrying out fertilization in a conventional leaf vegetable fertilizing manner. According to the crop rotation method, the content of Cd in the leaf vegetables can be obviously reduced in an aquatic leaf vegetable and low accumulation type dry-farmed leaf vegetable crop rotation mode; the leaf vegetables are enabled to accord with the national food hygiene standards; the crop rotation method has the advantages of convenience for implementation, simplicity for operation and the like.

Description

technical field [0001] The invention relates to a cultivation method of leafy vegetables, in particular to a crop rotation method for reducing cadmium content of leafy vegetables. Background technique [0002] In recent years, unreasonable industrial and agricultural activities have led to the accumulation of heavy metals in a considerable number of vegetable soils in my country, among which the problem of excessive cadmium (Cd) content is more prominent. Cd is a heavy metal element with high bioavailability, strong accumulation and high toxicity. Compared with other heavy metals, Cd is more easily absorbed by crops, especially leafy vegetables, and is one of the most important heavy metal pollution elements in leafy vegetables. Leafy vegetables are the type of vegetables with the largest daily consumption. Cd enters and accumulates in the human body through the food chain, posing a potential threat to human health. Therefore, it is an urgent task to find ways to effectivel...

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Problems solved by technology

However, the variety mix in this interplanting model is relatively simple, such as the super-accumulator sedum + low-accumulation plant corn, sedum + high potassium-rich taro varieties, etc., which are more suitable for small plots with serious pollution

At present, most of the polluted farmlands are relatively light in pollution, and the adoption of this model will affect the yield per unit area of ​​agricultural products, thereby affecting economic benefits, and it is difficult to popularize and apply it on a large scale in practice.

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