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
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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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