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Method for no-tillage remediation of heavy metal polluted farmland through intercropping of pennisetum purpureum and astragalus sinicus

A technology of milk vetch and heavy metals, applied in the field of resources and environment, can solve the problems of low efficiency of plant extraction and restoration, achieve the effects of reducing costs and environmental risks, promoting overwintering, and fixing soil nutrients

Pending Publication Date: 2022-02-15
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, the efficiency of plant extraction and restoration is relatively low. How to improve the efficiency of plants to repair heavy metals has become an urgent problem to be solved.

Method used

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  • Method for no-tillage remediation of heavy metal polluted farmland through intercropping of pennisetum purpureum and astragalus sinicus
  • Method for no-tillage remediation of heavy metal polluted farmland through intercropping of pennisetum purpureum and astragalus sinicus
  • Method for no-tillage remediation of heavy metal polluted farmland through intercropping of pennisetum purpureum and astragalus sinicus

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Soil preparation

[0042] In April 2019, the farmland with a cadmium metal content of 0.6mg / kg was rotary tilled, and the depth should be 20-25cm. According to the width of each compartment of 1.2 ~ 1.4m, the ground preparation is divided into compartments, and the trenches are opened. The compartment trenches are 40cm wide and 20cm deep; the drainage ditches are opened according to the width of the trenches 40cm and 30cm deep;

[0043] 2. Elephant grass transplanting

[0044] In April 2019 (the temperature is stable above 15°C), select rooted individual seedlings with a height of 30-40 cm, remove the top leaves, and plant 2 rows per box, with a plant spacing of 40-50 cm and a row spacing of 50-60 cm. , accompanied by compound fertilizer (total nutrient ≥ 51%, the nitrogen content in the compound fertilizer is calculated as pure nitrogen, and the phosphorus content is calculated as P 2 o 5 In terms of potassium content in K 2 O meter, mass ratio N:P 2 o 5 :K 2...

Embodiment 2

[0068] Example 1 Elephant grass regeneration after stubble overwintering. On April 1, 2020, milk vetch was hoeed into the plowing layer 20-25 cm, and compound base fertilizer was applied according to Example 1, water management and weed control, no topdressing, and follow-up Also according to the mode of embodiment 1, milk vetch is intercropped around the regenerated elephant grass, and the stubble is harvested again.

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Abstract

The invention belongs to the technical field of resources and environments, and particularly relates to a method for no-tillage remediation of a heavy metal polluted farmland through intercropping pennisetum purpureum and astragalus sinicus. The method comprises the following steps: planting pennisetum purpureum, intercropping astragalus smicus, harvesting and remaining stubbles after the pennisetum purpureum is mature, hoeing the mature astragalus smicus into a plough layer in the next year, and performing secondary repair by utilizing overwintering pennisetum purpureum. The result of the embodiment shows that the annual dry biomass and the cadmium removal amount of the overwintering regenerated pennisetum purpureum can reach 60.60 t / ha and 29.09 g / ha respectively, and the cadmium content in the pennisetum purpureum is lower than the Chinese feed hygienic standard limit value.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a method for no-tillage restoration of farmland polluted by heavy metals by intercropping milk vetch with elephant grass. Background technique [0002] In recent years, with the development of industry and urbanization, the pollution risk of farmland soil in my country has become more prominent and has received more and more attention. Among them, soil heavy metal pollution has received special attention because harmful heavy metals can persist in the soil environment, accumulate and pass through the biological food chain, and cause harmful effects on human health. It is of great significance for the restoration of heavy metal-contaminated farmland soil. [0003] Phytoextraction is a technique that uses plants to transfer heavy metals from the soil to the above-ground parts, which are relatively easy to handle. It is powered by solar energy. Compare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 龙坚覃建军彭佩钦侯红波
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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