Method for realizing safety production of rice in cadmium-polluted rice area through rice-rape rotation cropping
A technology for safe production and cadmium pollution, applied in rice cultivation, fertilization methods, leaf crop cultivation, etc., can solve the problems of cadmium pollution, serious problems, etc., and achieve the effect of broad application prospects
Inactive Publication Date: 2021-08-17
HUNAN HYBRID RICE RES CENT
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[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for rice oil rotation to realize the safe production of rice in cadmium-contaminated rice areas, which has the advantages of ensuring the safe production of rice and solves the increasingly serious problem of cadmium pollution in farmland soil
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[0028] Implementation location: Qiyang County, Yongzhou City, Hunan Province, yellow brown soil, the total soil cadmium content is 0.594mg / kg, the first rice-oil rotation from October 2018 to September 2019, from October 2019 to September 2020 The second rice-oil rotation was carried out, and the blank control was rice and rape straw returning to the field, and no lime was applied and no flooding was performed during the rice cultivation.
[0029] (1) Screening of hyperaccumulative rape varieties, the method is as follows:
[0030] (A) Xiangzayou 631, Xiangzayou 763, Xiangza No. 5, Huajun, Zheyou 50, Zheshuang 72, Zhongyou 589, Zhongyou 821, Huaxiangyou No. 16, Zhengza No. 1 and Hope 106 in total 11 varieties are candidates for selection.
[0031] (B) The plump and intact seeds of each variety are screened, soaked in 5% potassium permanganate solution, and then dried, and the seeds are evenly sown on the seedbed, and transplanted to the cadmium-contaminated farmland when the ...
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The invention relates to the technical field of rice production, and discloses a method for realizing safety production of rice in a cadmium-polluted rice area by rice-rape rotation cropping. The method comprises the following steps: (1) screening rape varieties with cadmium hyperaccumulation; (2) screening rice varieties with low grain cadmium accumulation; (3) conducting soil preparation and fertilization of to-be-remediated soil; (4) cultivating rape with cadmium hyperaccumulation; (5) harvesting rapeseeds and removing rape straw; (6) conducting soil preparation and lime application; (7) planting the low-cadmium rice and performing flooding irrigation; and (8) harvesting low-cadmium rice and removing rice straw. According to the method, the hyperaccumulation characteristic of the rape on cadmium is utilized, rape straw is removed, part of cadmium ions in the soil of the medium-light cadmium-polluted rice area are reduced, lime is applied in cooperation during rice cultivation, field shallow water irrigation is kept in the heading stage, field wetting and drying alternation is kept in the filling stage, and safe production of rice and rape in the medium-light cadmium-polluted rice area can be achieved, and the method has the characteristics of being economical, safe, efficient, simple and easy to implement.
Description
technical field [0001] The invention relates to the technical field of rice production, in particular to a method for realizing safe rice production in cadmium-polluted rice areas by rice oil rotation. Background technique [0002] Cadmium has high mobility and high toxicity, and is easy to accumulate in the human body through the food chain. The biological half-life of cadmium in the human body is 10-30 years, which will cause dysfunction of the human liver and kidney, damage the human immune system, and cause bone softening and malignant tumors. The production of cadmium was listed as a Class I carcinogen by the International Agency for Research on Cancer as early as 1993. Since the last century, cadmium pollution in farmland soil has become increasingly serious. According to the National Soil Pollution Survey issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014 Bulletin, 7% of the soil in China is polluted with cadmium, and 0.5...
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IPC IPC(8): A01G22/22A01G22/15A01C21/00
CPCA01G22/22A01G22/15A01C21/005
Inventor 柏斌罗秋红吴俊姚栋萍沈泓廖聪
Owner HUNAN HYBRID RICE RES CENT