Application of grain amaranth in repairing cadmium contaminative soil

Abstract

The invention relates to the application of grain amaranth (Amaranthus hypochondriacus L.CU.) in restoration of cadmium pollution in soil. The invention is to sow three kinds of optimized grain amaranth of R104, K112 and K427 in cadmium polluted soil, and then reap the above-ground biomass to conduct centralized retting and landfill for effectively clearing cadmium in soil. The invention has high efficiency, easy operation, non-secondary pollution and low cost, and the grain amaranth is the common grazing, which is easy to plant, people are familiar with the growth and agronomic habit, so the promotion and application are easy, the concentration coefficient is high, cadmium gathered from the 5mg / kg of polluted farmland shows that the concentration of cadmium in leaf is about 120mg / kg, the stem part is about 65mg / kg, root part is about 69mg / kg, total biomass of the first-cut can reach 4-6t per mu, the yearly amount can reach 10-15t per mu, the first-cut can lower the cadmium pollution level of the plow layer (0-20cm) by 0.4-0.6mg / kg each year, and farmland of the middle and low degree cadmium pollution can meet the safety production requirements in a few years, so the invention is suitable for deposition type pollution cultivated land in delta areas.

Description

technical field

[0001] The invention relates to a new application of plant grain amaranth (Amaranthus hypochondriacus L.Cv.), in particular to application in repairing cadmium-contaminated soil. Background technique

[0002] With the rapid development of our country's economy, on the one hand, people's living standards have been continuously improved, but on the other hand, it has brought serious pollution. At present, the area of ​​land polluted by heavy metals in my country is very large. The area of ​​cultivated land polluted by heavy metals such as cadmium, arsenic, chromium and lead reaches 20 million hectares, accounting for about 1 / 5 of the total cultivated land area. According to a survey organized by the State Environmental Protection Administration, the Pearl River Delta, the Yangtze River Delta, and the Bohai Sea Rim, where the economy developed first, have serious soil pollution problems. Among them, 40% of the farmland in the Pearl River Delta contains excessive...

Examples

Embodiment 1

[0012] Embodiment 1: the application effect of grain amaranth (Amaranthus hypochondriacus L.CU.) R104

[0013] In the soil containing cadmium 5mg / kg, sow grain amaranth with the intensity of 500g seeds per mu, apply organic fertilizer 1000kg / mu and potassium chloride 80kg / mu, thin the seedlings at a height of 10-15cm, and set the seedlings at a distance of 50cm×20cm. Each time it grows for 60 days, and each time thereafter, each time for 50 days, harvest the above-ground biomass and pile it up for landfill. Each harvest leaves 15 cm of stubble, leaving 1 to 2 functional leaves. After cutting, apply 50 kg / mu of urea , Potassium chloride 30kg / mu, measure the cadmium content of each three samples of first stubble leaf, stem, root, and dry matter leaf / stem ratio, the results are shown in Tables 1 and 2. The wet weight of the first crop biomass is about 4t / mu. Calculated on the basis of the dry biomass of about 800kg / mu, the grain amaranth can remove about 82g of cadmium from the s...

Embodiment 2

[0014] Embodiment 2: the application effect of grain amaranth (Amaranthus hypochondriacus L.CU.) K112

[0015] Experimental method is the same as embodiment 1. See Tables 1 and 2 for the cadmium content of each of the three samples of leaves, stems, and roots, and the results of the dry matter leaf / stem ratio. The wet weight of the first crop biomass is about 4.8t / mu. Calculated based on the dry biomass of about 960kg / mu, the grain amaranth can remove about 98g of cadmium from the soil every year, which is equivalent to a decrease of 0.5mg / kg of cadmium in the 20cm plow layer (plow layer Soil volume 667m 2 ×0.2m×1500kg / m 3 , about 200t). Harvested plants are composted and landfilled as hazardous waste.

Embodiment 3

[0016] Embodiment 3: the application effect of grain amaranth (Amaranthus hypochondriacus L.CU.) K427

[0017] Experimental method is the same as embodiment 1. See Tables 1 and 2 for the cadmium content of each of the three samples of leaves, stems, and roots, and the results of the dry matter leaf / stem ratio. The wet weight of the first crop biomass is about 6t / mu. Calculated based on the dry biomass of about 1200kg / mu, the grain amaranth can remove about 118g of cadmium from the soil every year, which is equivalent to a decrease of 0.6mg / kg of cadmium in the 20cm plow layer (plow layer soil Volume 667m 2 ×0.2m×1500kg / m 3 , about 200t). Harvested plants are composted and landfilled as hazardous waste.

[0018] Table 1 The cadmium content (mg / kg) of three kinds of grain amaranth cultivated in the soil containing 5 mg / kg cadmium

[0019] Variety

[0020] Table 2 The amount of cadmium removed from the soil by the aboveground part of grain amaranthus (g / mu)

[00...

technical field

[0001] The invention relates to a new application of plant grain amaranth (Amaranthus hypochondriacus L.Cv.), in particular to application in repairing cadmium-contaminated soil. Background technique

[0002] With the rapid development of our country's economy, on the one hand, people's living standards have been continuously improved, but on the other hand, it has brought serious pollution. At present, the area of ​​land polluted by heavy metals in my country is very large. The area of ​​cultivated land polluted by heavy metals such as cadmium, arsenic, chromium and lead reaches 20 million hectares, accounting for about 1 / 5 of the total cultivated land area. According to a survey organized by the State Environmental Protection Administration, the Pearl River Delta, the Yangtze River Delta, and the Bohai Sea Rim, where the economy developed first, have serious soil pollution problems. Among them, 40% of the farmland in the Pearl River Delta contains excessive...

Examples

Embodiment 1

[0012] Embodiment 1: the application effect of grain amaranth (Amaranthus hypochondriacus L.CU.) R104

[0013] In the soil containing cadmium 5mg / kg, sow grain amaranth with the intensity of 500g seeds per mu, apply organic fertilizer 1000kg / mu and potassium chloride 80kg / mu, thin the seedlings at a height of 10-15cm, and set the seedlings at a distance of 50cm×20cm. Each time it grows for 60 days, and each time thereafter, each time for 50 days, harvest the above-ground biomass and pile it up for landfill. Each harvest leaves 15 cm of stubble, leaving 1 to 2 functional leaves. After cutting, apply 50 kg / mu of urea , Potassium chloride 30kg / mu, measure the cadmium content of each three samples of first stubble leaf, stem, root, and dry matter leaf / stem ratio, the results are shown in Tables 1 and 2. The wet weight of the first crop biomass is about 4t / mu. Calculated on the basis of the dry biomass of about 800kg / mu, the grain amaranth can remove about 82g of cadmium from the s...

Embodiment 2

[0014] Embodiment 2: the application effect of grain amaranth (Amaranthus hypochondriacus L.CU.) K112

[0015] Experimental method is the same as embodiment 1. See Tables 1 and 2 for the cadmium content of each of the three samples of leaves, stems, and roots, and the results of the dry matter leaf / stem ratio. The wet weight of the first crop biomass is about 4.8t / mu. Calculated based on the dry biomass of about 960kg / mu, the grain amaranth can remove about 98g of cadmium from the soil every year, which is equivalent to a decrease of 0.5mg / kg of cadmium in the 20cm plow layer (plow layer Soil volume 667m 2 ×0.2m×1500kg / m 3 , about 200t). Harvested plants are composted and landfilled as hazardous waste.

Embodiment 3

[0016] Embodiment 3: the application effect of grain amaranth (Amaranthus hypochondriacus L.CU.) K427

[0017] Experimental method is the same as embodiment 1. See Tables 1 and 2 for the cadmium content of each of the three samples of leaves, stems, and roots, and the results of the dry matter leaf / stem ratio. The wet weight of the first crop biomass is about 6t / mu. Calculated based on the dry biomass of about 1200kg / mu, the grain amaranth can remove about 118g of cadmium from the soil every year, which is equivalent to a decrease of 0.6mg / kg of cadmium in the 20cm plow layer (plow layer soil Volume 667m 2 ×0.2m×1500kg / m 3 , about 200t). Harvested plants are composted and landfilled as hazardous waste.

[0018] Table 1 The cadmium content (mg / kg) of three kinds of grain amaranth cultivated in the soil containing 5 mg / kg cadmium

[0019] Variety

[0020] Table 2 The amount of cadmium removed from the soil by the aboveground part of grain amaranthus (g / mu)

[00...