Safety production method for crop rotation planting of sweet potatoes and oilseed rapes in heavy metal polluted farmland

A technology for crop rotation and safe production, which is applied to the restoration of polluted soil and other directions, can solve the problems of safe utilization of polluted farmland, low content of heavy metals, and excessive heavy metals in agricultural products, and achieves simple planting methods, simple planting methods, production and application methods. easy effect

Inactive Publication Date: 2020-09-15
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned background, the invention of the present invention aims to propose a safe production method for planting sweet potato and rapeseed rotation in medium-to-severe Cd and Pb-contaminated farmland, so that the content of heavy metals in the edible parts of sweet potato and rapeseed is lower than the standard limit value, and solves the problem of medium-to-severe pollution. Heavy metal pollution in farmland The problem of excessive heavy metals in agricultural products, to achieve safe utilization of polluted farmland

Method used

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  • Safety production method for crop rotation planting of sweet potatoes and oilseed rapes in heavy metal polluted farmland
  • Safety production method for crop rotation planting of sweet potatoes and oilseed rapes in heavy metal polluted farmland
  • Safety production method for crop rotation planting of sweet potatoes and oilseed rapes in heavy metal polluted farmland

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Embodiment example 1

[0029] From 2017 to 2018, field planting was carried out in a farmland heavily polluted by heavy metals in northern Hunan. The area is located in the humid subtropical monsoon climate zone, with an annual average temperature of 17.5°C, an annual precipitation of 1400 to 1700 mm, and a frost-free period of about 275 days. The soil type is red soil. The basic physical and chemical properties of the soil before planting are as follows:

[0030] Table 1 Basic physical and chemical properties of soil

[0031]

[0032] The planting process is as follows:

[0033] (1) Farmland finishing: Weeding, removing impurities, ditching, and leveling the farmland manually, setting up a quadrat of 3m×4m, and repeating each treatment 3 times.

[0034] (2) Apply soil conditioner: the soil conditioner is prepared by uniformly mixing calcium carbonate and sepiolite at a mass ratio of 2:1. Calcium carbonate, whiteness>90, particle size>200 mesh, sedimentation volume (2.4-2.8mL·g -1 ); sepioli...

Embodiment example 2

[0061] From 2018 to 2019, field planting was carried out in a farmland heavily polluted by heavy metals Cd and Pb in northern Hunan. The area is located in the humid subtropical monsoon climate zone, with an annual average temperature of 17.5°C, an annual precipitation of 1400-1700mm, and a frost-free period of about 275 days. The soil type is red soil. The basic physical and chemical properties of the soil before planting are as follows:

[0062] Table 6 Basic physical and chemical properties of soil

[0063]

[0064] The sweet potato planting time is from June 4th to October 7th, and the rapeseed planting time is from October 10th to May 15th. The planting process is as follows:

[0065] (1) Farmland finishing: manual weeding, impurity removal, ditching and leveling of the farmland. Sample plots were set up according to 3m×4m, and each treatment was repeated 3 times.

[0066] (2) Apply soil conditioner: the soil conditioner is prepared from calcium carbonate and sepio...

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Abstract

The invention discloses a safety production method for crop rotation planting of sweet potatoes and oilseed rapes in a heavy metal polluted farmland instead of crop rotation. The method is used for crop rotation of summer crops sweet potatoes and overwintering crops oilseed rapes on Cd and Pb moderately and heavily polluted soil, and specifically comprises the following steps: (1) the sweet potatoplanting period is from June to October, and the oilseed rape planting period is from October to May of the next year; (2) carrying out farmland weeding, impurity removal, ditching and leveling workaccording to the planting requirements and the field area; (3) applying a soil conditioner before sweet potato planting; (4) transplanting the sweet potatoes with the varieties of 98 Hunan potatoes, 19 commercial potatoes, 24 Suzhou potatoes and 98 Yu potatoes; (5) after the sweet potatoes are ripe and harvested, removing overground stems and leaves from the field, and performing centralized recovery treatment; (6) sowing and planting oilseed rape of which the variety is saliva oil 823, oil millstone 2013, Hunan miscellaneous oil 631 and oil-rich millstone 108; and (7) after the oilseed rape is mature and harvested, removing all straws on the ground from the field, and carrying out centralized recovery treatment. Low-accumulation-character sweet potatoes and oilseed rapes are selected forcrop rotation, the planting method is simple, and the total amount of heavy metal in farmland soil can be reduced year by year.

Description

technical field [0001] The invention belongs to the field of phytoremediation technology of heavy metal-contaminated soil and the technical field of agricultural product quality and safety, and in particular relates to a safe production method for planting sweet potatoes and rapeseed in crop rotation instead of medium-heavy heavy metals (Cd and Pb) polluted farmland. Background technique [0002] Soil heavy metal pollution is one of the major environmental pollution problems in recent decades. Heavy metals in cultivated soil are absorbed and stored in the phloem through the xylem of crops, and can enter the human body and livestock through the food chain, causing serious harm to the human body and livestock organs such as the kidney. According to the survey, the rate of 8 heavy metal pollution sites exceeding the standard is cadmium (Cd), mercury (Hg), arsenic (As), copper (Cu), lead (Pb), chromium (Cr), zinc (Zn) and nickel (Ni). 7.0%, 1.6%, 2.7%, 2.1%, 1.5%, 1.1%, 0.9%, 4...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/08B09C1/105B09C2101/00
Inventor 辜娇峰廖柏寒周航黄芳袁腾跃姚瑶
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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