Method for repairing cadmium-polluted farmland by using corn and alfred stonecrop intercropping

Abstract

The invention discloses a method for repairing a cadmium-polluted farmland by using corn and alfred stonecrop intercropping. The method comprises the following steps: (1) in the cadmium-polluted farmland soil, planting corn seedlings and alfred stonecrop seedlings by using an intercropping mode, dressing a nitrogen phosphorus and potassium compound fertilizer and an organic fertilizer for promoting the growth of the corn and alfred stonecrop; (2) within a week after dressing the fertilizers, spraying oilseed rape root extracting solution to the root of the alfred stonecrop, harvesting the alfred stonecrop regularly, and harvesting the corn after the corn is matured; the preparation process of the oilseed rape root extracting solution comprises the following steps: a, pounding the fresh oilseed rape root, soaking in water, heating and boiling for more than 1 h, cooling soaking liquid to the room temperature, and stewing for more than 24 h; and b, after stewing, separating solid and liquid, and taking a liquid phase which is the oilseed rape root extracting solution. The method is capable of realizing a corn and alfred stonecrop intercropping technology, through spraying the oilseedrape root extracting solution to the root of the alfred stonecrop, overcoming the problem in the prior art that the Cd content in the corn is still high after the corn and alfred stonecrop intercropping and the plant removal rate of Cd in the soil is not high.

Description

technical field

[0001] The invention belongs to the technical field of heavy metal polluted soil treatment, and in particular relates to a method for repairing cadmium polluted farmland by intercropping corn and sedum sedum. Background technique

[0002] Farmland is an important part of the human ecological environment, the material basis for sustainable economic and social development, and one of the main natural resources on which human beings depend, directly related to the lives and health of the people. Since the 1990s, with the rapid development of industrialization, urbanization, and agricultural modernization, toxic heavy metals from various sources have entered the farmland environment in multiple forms, in multiple ways, and in multiple ways, such as water, gas (dust), slag, fertilizer, and medicine. , causing large areas of farmland to be polluted by heavy metals. Cd has strong accumulation and migration ability in farmland, and can affect deep soil. Cd enters h...

Examples

Embodiment 1

[0031] Take the above-mentioned test field, and plant corn and Sedum sedum in the middle of the test field. The steps include:

[0032] (1) In spring, in the soil of the experimental field, the seedlings of corn and Sedum sedum seedlings are intercropped, one row of corn and one row of Sedum sedum, the intercropping density of corn and Sedum sedum is 15-20cm, and the row spacing is 20-20cm. 40cm, planted in a greenhouse, the planting temperature is controlled at 25-28°C during the day, 18-20°C at night, the soil humidity is controlled at 60%-70%, and the seedlings are topdressed twice 2 weeks and 3 months after transplanting to promote the southeast view. The nitrogen, phosphorus and potassium compound fertilizer and organic fertilizer grown in Tianhe corn, of which the amount of farmyard fertilizer is 2000kg / mu, and the amount of nitrogen, phosphorus and potassium compound fertilizer is 100kg / mu;

[0033] (2) Within a week after topdressing fertilizer, spray rapeseed root ext...

Embodiment 2～6

[0038] Get five above-mentioned test fields, in each test field, all intercropping planting corn and Sedum sedum, planting method and cultivation method are the same as embodiment 1, and its difference is only: the spraying amount of rape root extract in the step (2) of each embodiment Different, other steps are identical with embodiment 1. The spray amount of rapeseed root extract used in each embodiment is shown in Table 1.

[0039] Adopt the method identical with embodiment 1 to measure respectively the content of Cd in the sedum sedum that each group of embodiment harvests, the content of Cd in the soil after a corn planting cycle and the content of Cd in the harvested corn grain, the results are shown in table 2 .

technical field

[0001] The invention belongs to the technical field of heavy metal polluted soil treatment, and in particular relates to a method for repairing cadmium polluted farmland by intercropping corn and sedum sedum. Background technique

[0002] Farmland is an important part of the human ecological environment, the material basis for sustainable economic and social development, and one of the main natural resources on which human beings depend, directly related to the lives and health of the people. Since the 1990s, with the rapid development of industrialization, urbanization, and agricultural modernization, toxic heavy metals from various sources have entered the farmland environment in multiple forms, in multiple ways, and in multiple ways, such as water, gas (dust), slag, fertilizer, and medicine. , causing large areas of farmland to be polluted by heavy metals. Cd has strong accumulation and migration ability in farmland, and can affect deep soil. Cd enters h...

Examples

Embodiment 1

[0031] Take the above-mentioned test field, and plant corn and Sedum sedum in the middle of the test field. The steps include:

[0032] (1) In spring, in the soil of the experimental field, the seedlings of corn and Sedum sedum seedlings are intercropped, one row of corn and one row of Sedum sedum, the intercropping density of corn and Sedum sedum is 15-20cm, and the row spacing is 20-20cm. 40cm, planted in a greenhouse, the planting temperature is controlled at 25-28°C during the day, 18-20°C at night, the soil humidity is controlled at 60%-70%, and the seedlings are topdressed twice 2 weeks and 3 months after transplanting to promote the southeast view. The nitrogen, phosphorus and potassium compound fertilizer and organic fertilizer grown in Tianhe corn, of which the amount of farmyard fertilizer is 2000kg / mu, and the amount of nitrogen, phosphorus and potassium compound fertilizer is 100kg / mu;

[0033] (2) Within a week after topdressing fertilizer, spray rapeseed root ext...

Embodiment 2～6

[0038] Get five above-mentioned test fields, in each test field, all intercropping planting corn and Sedum sedum, planting method and cultivation method are the same as embodiment 1, and its difference is only: the spraying amount of rape root extract in the step (2) of each embodiment Different, other steps are identical with embodiment 1. The spray amount of rapeseed root extract used in each embodiment is shown in Table 1.

[0039] Adopt the method identical with embodiment 1 to measure respectively the content of Cd in the sedum sedum that each group of embodiment harvests, the content of Cd in the soil after a corn planting cycle and the content of Cd in the harvested corn grain, the results are shown in table 2 .

Images