Method for inhibiting soil available cadmium releasing and rice Cd accumulation in rice fields
An effective state and soil technology, which is applied in the fields of soil preparation methods, rice cultivation, agricultural machinery and tools, etc., can solve the problems of increasing the risk of secondary pollution of the farmland environment and rice, poor results, and increased organic pollutants, and achieves a reduction Rice Cd content, improvement of quality and safety, effect of increasing content
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Embodiment 1
[0028] S1: with 0.1M CaCl 2 The extract solution extracts the soil, the metal content in the extracted state is Cd 1.7mg / kg, Zn 47.2mg / kg, according to this specific data, calculate the ZnSO needed when the Zn / Cd molar ratio in the potted 3.0kg soil is 100 and 200 respectively 4 The amount of exogenous addition is 0.4g and 1.1g respectively;
[0029] S2: Add the ZnSO that needs to be added 4 After adding to the water to dissolve completely, add the solution to the soil and stir well;
[0030] S3: Plant rice seedlings after 1 week of soil flooding, cooperate with conventional rice water management measures, harvest rice seeds after 2 weeks of drainage in the late stage of rice filling, and detect the availability of Cd in the soil and the content of Cd in rice.
[0031] apply effects ( figure 1 ): By the above method, adopt the soil in Zhuzhou, Hunan to implement the rice pot experiment, when harvesting, soil Zn / Cd=100 corresponds to soil available Cd reduced by 44.9%, grain...
Embodiment 2
[0033] S1: with 0.1M CaCl 2 The extract solution extracts the soil, and the metal content in the extracted state is 1.6mg / kg Cd and 4.0mg / kg Zn. According to this specific data, calculate the ZnSO needed when the molar ratio of Zn / Cd in 3.0kg soil of potted plants is 100 and 200 respectively 4 The amount of exogenous addition is 0.7g and 1.3g respectively;
[0034] S2: Add the ZnSO that needs to be added 4 After adding to the water to completely dissolve, add the solution to the soil, stir well and soak;
[0035] S3: Plant rice seedlings after 1 week of soil flooding, cooperate with conventional rice water management measures, harvest rice seeds after 2 weeks of drainage in the late stage of rice filling, and detect the availability of Cd in the soil and the content of Cd in rice.
[0036] apply effects ( figure 2 ): By the above method, adopting Hunan Xiangtan soil to implement rice pot experiment, soil Zn / Cd=100 corresponds to soil available Cd reduced by 31.7% during harv...
Embodiment 3
[0038] S1: with 0.1M CaCl 2 The extract is used to extract the soil, the metal content of the soil extract is 0.8mg / kg Cd, 4.9mg / kg Zn, and 75kg ZnSO is applied per hectare of field 4 ; Detect 0.1M CaCl in soil after application 2 The extracted metal content is Cd0.9mg / kg, Zn is 43.4mg / kg, and the molar ratio of Zn / Cd in the soil is 83.4;
[0039] S2: Before the paddy field is plowed, the ZnSO that needs to be added 4 After adding to the water and completely dissolving, sprinkle the solution into the soil and mix it with the tillage layer soil;
[0040] S3: Plant rice seedlings after 1 week of soil flooding, cooperate with conventional rice water management measures, harvest rice seeds after 2 weeks of drainage in the late stage of rice filling, and measure Cd availability in soil and Cd content in rice.
[0041] apply effects ( image 3 ): select Beishan Town, Changsha County, Hunan Province by the above method to carry out field test, set contrast and add Zn treatment pl...
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