Repairing method of cadmium polluted farmlands and applications thereof

Abstract

The invention provides a repairing method of cadmium polluted farmlands and applications thereof, and relates to the technical field of agricultural plantation. According to the repairing method, cornand amaranth are intercropped in a cadmium polluted farmland; and the intercropping mode is as follows: (1) corn plants are planted in wide rows and narrow rows, between two neighbored wide corn rows, one to two rows of amaranth plants are planted; (2) corn plants are planted in rows with equal spacing, and between two neighbored corn rows, one to two rows of amaranth plants are planted; and (3)four rows of corn plants and four rows of amaranth plants are planted at intervals alternatively. The provided repairing method can obviously improve the efficiency of repairing cadmium polluted farmlands; the cadmium removal rate is increased to 363.1 to 873.4 mg / mu; the corn output is barely influenced; and the output is increased by 10.5%.

Description

technical field

[0001] The invention belongs to the technical field of agricultural planting, and in particular relates to a method for repairing cadmium-contaminated farmland and its application. Background technique

[0002] Due to the long-term irrigation of farmland sewage, the use of pesticides and fertilizers, the development of mineral resources, the development of industrial production and other human factors, as well as natural factors such as earthquakes, volcanic eruptions, weathering of heavy metal bedrock and geological processes, the pollution of heavy metals in farmland has become increasingly serious. Affected by heavy metal pollution, my country's grain production is reduced by 10 million tons every year, and the direct economic loss exceeds 20 billion yuan. In addition, heavy metals in farmland ecosystems can also pass along the food chain, endangering human health. Therefore, the remediation of heavy metal pollution in farmland soil is urgent.

[0003] A...

Examples

Embodiment 1

[0032] In moderate to light cadmium polluted farmland, such as figure 1 Corn is planted in wide and narrow rows as shown, and grain amaranth is planted intercropping in the wide row of corn. The wide row spacing of the corn is 100 cm, the narrow row spacing is 40 cm, and the plant spacing is 25 cm; the grain amaranth is planted in the middle of the wide row of corn. The row spacing between grain amaranths is 50cm, and the distance between grain amaranth plants is 60cm.

Embodiment 2

[0034] In moderate to light cadmium polluted farmland, such as figure 2 Corn is planted in wide and narrow rows as shown, and grain amaranth is planted in intercropping in the wide row of corn. The wide row spacing of the corn is 100cm, the narrow row spacing is 40cm, and the plant spacing is 25cm; The row spacing between grain amaranths is 33cm, and the distance between grain amaranth plants is 60cm.

Embodiment 3

[0036] In moderate to light cadmium polluted farmland, such as image 3 The corn is planted at the same row spacing as shown, and the grain amaranth is planted between the corn rows. The row spacing of the corn is 100cm, and the plant spacing is 20cm; the grain amaranth is planted in one row in the middle of the corn row, and the row spacing between the grain amaranth and the corn and the grain amaranth is 50cm. , grain amaranth plant distance 60cm.

technical field

[0001] The invention belongs to the technical field of agricultural planting, and in particular relates to a method for repairing cadmium-contaminated farmland and its application. Background technique

[0002] Due to the long-term irrigation of farmland sewage, the use of pesticides and fertilizers, the development of mineral resources, the development of industrial production and other human factors, as well as natural factors such as earthquakes, volcanic eruptions, weathering of heavy metal bedrock and geological processes, the pollution of heavy metals in farmland has become increasingly serious. Affected by heavy metal pollution, my country's grain production is reduced by 10 million tons every year, and the direct economic loss exceeds 20 billion yuan. In addition, heavy metals in farmland ecosystems can also pass along the food chain, endangering human health. Therefore, the remediation of heavy metal pollution in farmland soil is urgent.

[0003] A...

Examples

Embodiment 1

[0032] In moderate to light cadmium polluted farmland, such as figure 1 Corn is planted in wide and narrow rows as shown, and grain amaranth is planted intercropping in the wide row of corn. The wide row spacing of the corn is 100 cm, the narrow row spacing is 40 cm, and the plant spacing is 25 cm; the grain amaranth is planted in the middle of the wide row of corn. The row spacing between grain amaranths is 50cm, and the distance between grain amaranth plants is 60cm.

Embodiment 2

[0034] In moderate to light cadmium polluted farmland, such as figure 2 Corn is planted in wide and narrow rows as shown, and grain amaranth is planted in intercropping in the wide row of corn. The wide row spacing of the corn is 100cm, the narrow row spacing is 40cm, and the plant spacing is 25cm; The row spacing between grain amaranths is 33cm, and the distance between grain amaranth plants is 60cm.

Embodiment 3

[0036] In moderate to light cadmium polluted farmland, such as image 3 The corn is planted at the same row spacing as shown, and the grain amaranth is planted between the corn rows. The row spacing of the corn is 100cm, and the plant spacing is 20cm; the grain amaranth is planted in one row in the middle of the corn row, and the row spacing between the grain amaranth and the corn and the grain amaranth is 50cm. , grain amaranth plant distance 60cm.

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