Improving agent and method for preparing same and blocking heavy metal absorption by crops
A technology for improving agents and crops is applied in the field of chemical-biological joint restoration of heavy metal contaminated soil, which can solve problems such as reducing the activity of heavy metals in soil, and achieve the effects of ensuring safe production and inhibiting and controlling absorption.
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[0034] A method for preparing a modifier, comprising the following steps:
[0035] Mix biochar with potassium dihydrogen phosphate solution, and obtain acid-modified biochar at a reaction temperature of 80°C-100°C, a stirring speed of 1000-1200r / min, and a reaction time of 24 hours;
[0036] Mixing acid-modified biochar and humic acid.
[0037] A method for blocking the absorption of heavy metals by crops, comprising the following steps:
[0038] 10 days before sowing of crops, 30-45 days after sowing, and 50-75 days after sowing, apply 6%-8%, 10%-20%, 2%-5% of the above-mentioned improvers to the surface soil with a thickness of 20cm. Mix the top soil; at the same time, apply 2-5kg / m at one time before sowing 3 The microbial compound bacterial agent; the crops are gramineous crops or leguminous crops.
[0039]The applicant found that the crop growth and the rhizosphere environment form a close relationship that is not only interdependent, mutually restricted, but also coor...
Embodiment
[0055] Embodiment A method for efficiently preventing and controlling the absorption of heavy metals by crops.
[0056] In this embodiment, the test site is a farmland with medium and light heavy metals in Xiangtan, Hunan. The soil pH is 6.23, the organic matter content is 32.4 g.
[0057] The soil for testing was leveled at the beginning of March in the first year, and the crops corn and soybean were planted at the end of March. The planting density was 30cm between plants and 60cm between rows, and the soil moisture content in the field was kept at 60%; Potassium 50kg / hm 2 , superphosphate 90kg / hm2, compound fertilizer (N:P:K 15:15:15) 150kg / hm2 2 , about 60 days after corn sowing (big trumpet mouth stage) topdressing potassium chloride 100kg / hm 2 , compound fertilizer (N:P:K 15:15:15) 150kg / hm 2 And urea 60kg / hm 2 ; Corn and soybean weeding were artificially weeded 3 times throughout the growth period. For corn and soybean, plant samples were taken every 15 days and 10...
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