Nitrogen fertilizer application method for planting vegetables in cadmium-copper combined polluted soil
A technology of compound pollution and application method, which is applied in the field of nitrogen fertilizer application for planting vegetables, can solve the problems of less research on nitrogen fertilizer regulation and complex heavy metal pollution, etc., and achieve the effect of low Cu content and increased yield
Pending Publication Date: 2022-04-22
INST OF SOIL SCI CHINESE ACAD OF SCI
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Problems solved by technology
Many studies only focus on Cd, a single heavy metal, and the pollution of its complex heavy metals, and its nitrogen fertilizer regulation are less researched.
Method used
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Embodiment 1
[0015] Soil pot experiment, the steps are: accurately weigh the cadmium-copper compound polluted soil (total Cd is 1.62mg·kg -1 , the total Cu is 120.69mg·kg -1 ;CaCl 2 -Cd is 0.31mg·kg -1 , CaCl 2 -Cu is 0.21mg·kg -1 ) 2.5kg, apply four different forms of nitrogen fertilizer: N0 (that is, no nitrogen fertilizer), NaNO 3 , NH 4 Cl, NaNO 3 +NH 4 Cl. NaNO 3 and NH 4 The nitrogen application rate of Cl treatment was 100mg nitrogen per kilogram of soil, NaNO 3 +NH 4 The nitrogen application rate of Cl treatment is: NaNO 3 and NH 4 Cl 50 mg nitrogen per kg each. The application amount of dicyandiamide is divided into ±0mg per kilogram and ±10mg per kilogram.
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The invention relates to a nitrogen fertilizer application method for planting vegetables in cadmium-copper combined polluted soil, which not only can increase the yield of lettuce by 15.83%, but also can reduce the content of Cd in the lettuce by 5.33%. Although the content of Cu is increased by 16%, the content of Cu is increased by 35.62% compared with ammonium nitrogen treatment, and the content of Cu is increased by 18.4% through ammonium nitrogen and nitrate nitrogen treatment, and the content is increased to the minimum. Compared with the prior art, by applying nitrate nitrogen, the yield is greatly increased, and the nitrate nitrogen is low in Cd and Cu content, green and safe and can be applied to a heavy metal combined pollution area.
Description
technical field [0001] The invention relates to the field of agricultural environment, in particular to a nitrogen fertilizer application method for planting vegetables in cadmium-copper composite polluted soil. Background technique [0002] With the development of industrialization, the problem of heavy metal pollution is increasing day by day. Some heavy metals accumulate in farmland soil through various ways, directly affecting the quality of vegetables grown on it. In recent years, there have been continuous research and reports on excessive heavy metals in vegetables (Yang Fuhua et al., 2021; Zhong Kecheng et al., 2021). In recent decades, scientists have successfully developed several strategies to reduce the accumulation of heavy metals in crops, such as covering polluted soil with uncontaminated soil, cleaning or immobilizing soil heavy metals, cultivating low-accumulating varieties, implementing agricultural management and bioremediation, etc. (Rizwan et al. al., 2...
Claims
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IPC IPC(8): A01C21/00A01G22/15
CPCA01C21/00A01G22/15
Inventor 赵学强
Owner INST OF SOIL SCI CHINESE ACAD OF SCI