Method for reducing accumulation of heavy metal in weak acid soil in bodies of crops
A technology for crops and heavy metals, applied in the direction of soil improvement machinery, fertilization methods, soil conditioning materials, etc., can solve problems such as affecting the enthusiasm for restoration, secondary soil pollution, and difficulty in promotion, reducing bioavailability, promoting plant growth, The effect of promoting the growth of crops
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Embodiment 1
[0021] Pb-contaminated soil was selected as the test soil. The concentration of Pb was 825.63 mg / kg, and the pH of the soil was 5.61. A pot experiment was adopted, with 2.5 kg of soil in each pot. The test crops were rapeseed and soybean, and 5 seedlings were kept in each pot. and 4 strains, the experimental setting without adding any modifier was treated as the control group, and each treatment group was set with 4 repetitions. Lime is added to the soil of each pot according to the amount of 5g / kg, and sodium montmorillonite is added to the amount of 10g / kg, and the lime, sodium montmorillonite and soil are mixed, aged for 5 days, according to rape N:P:K=0.25: 0.1:0.15mg / kg, soybean N:P:K=0.25:0.1:0.1mg / kg add inorganic fertilizer, 8g / kg add cow dung organic fertilizer to the soil as base fertilizer, transplant rapeseed and soybean respectively, and use it every day Irrigate with ionized water so that the soil moisture is 60-70% of the water holding capacity in the field. The...
Embodiment 2
[0027] The Cd-contaminated soil was selected as the soil for this experiment. The concentration of Cd was 1.37 mg / kg, and the pH of the soil was 5.95. A pot experiment was adopted, with 2.5 kg of soil in each pot. The test crops were rapeseed and soybean, and 5 seedlings were kept in each pot. and 4 strains, the experimental setting without adding any modifier was treated as the control group, and each treatment group was set with 4 repetitions. Add lime according to the amount of 4g / kg to each pot of soil, and the addition methods of all the other improvers and fertilizers are the same as in Example 1. The same method was planted continuously for 2 seasons, and only fertilizer was added in the 3rd season. The management method of each season was the same as that in Example 1, and the content of Cd and Se in the edible parts of the crops in each treatment group and the biomass of the aboveground parts were measured respectively.
[0028] The effects of different planting trea...
Embodiment 3
[0033] Field plot test: the test soil is brownish red soil, which belongs to Pb and Cd compound polluted soil, the concentrations of Pb and Cd are 513.28mg / kg and 1.29mg / kg respectively, the soil pH is 5.92, and the experimental site is located in a smelting plant 600-800m place. The test crops are rapeseed and soybean, and the experiment is set without adding any amendments as the control group. Each treatment is set up with 3 repetitions, a total of 12 plots, and the area of each plot is 1.2×2.3m 2 , The districts are separated by PVC partitions. According to 7600kg / hm 2 Add lime, add lime and Na-based montmorillonite to the soil, plow the soil to a depth of 15-20 cm, and add improvers and fertilizers according to the pot experiment method. The crops are supplied with sufficient water during the growth period, and the weeds are manually removed. The same method was planted continuously for 2 seasons, and only fertilizer was added in the 3rd season. The contents of Pb, ...
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