| A field experiment was designed in this study, and based on two kinds of N management, spraying sodium selenite on rice at booting stage, by measuring the selenium content of various organs of rice, nutrient uptake, dry weight, content of non-structural carbohydrate, contents of As and Cd of rice and other indicators ,find the effect of application of Se on the growth and safety quality of rice in order to provide the basis for the rice production in cold area. The major findings are as follows:1. Application of Se could promote the absorption of sodium selenite leaves and operation, improved the selenium content of rice leaves at heading and 20 days after heading, The treatment which applicated of selenium compared with the CK treatment was up to 1% significant level. Application of Se also can significantly increase selenium content of stems of rice at 20 days after heading, which will help selenium of panicle enrichment. Se can promote rice roots on N, P, K uptake, and phosphorus uptake was the most significant, compared with CK the content of Se reached 5% significant level..2. Dry matter accumulation of rice after heading, N1Se increased 1.11 t·hm-2 compared with the CK, N2Se was increased by the 1.78 t·hm-2. Dry matter accumulation after heading at the various stages of the process, panicle accumulation and total accumulation in the performance of the total Se than the CK, application of selenium promoted rice growth and development, increased dry matter accumulation. And yellow leaves weight of spraing selenium treatment at heading were lower than CK, indicating application of selenium can slow senescence of rice.3. Application of selenium significantly increased soluble sugar content of leaf and also increased NSC content of stem at heading, N1Se and N2Se compared with the CK, were increased by 26.11% and 12.69%;The apparent translocation ratio of NSC in the stem of rice after spraying Se were higher than the CK, reached the 5% significance level, which indicating application of selenium help the NSC in stems transport to panicle.4. 1000-grain weight of N2Se was 0.66g more than N2Se0, filled grain rate was 9 percentage points higher; 1000-grain weight of N1Se was 0.49g more than N1Se0, filled grain rate was 2.59 percentage points higher. N2Se was the highest yield, up to 11.17t·hm-2, compared with the CK increased by 13.78%, achieved 5% significant level; yield of N1Se reached 10.20 t·hm-2,was increased by 10.05%, also achieved a significant level of 5%. 5. Se content of brown rice of both N1Se and N2Se reached a state enterprise under the standard of food selenium(0.1~0.3mg·kg-1). Se content of polished rice of N1Se and N2Se was 103.19μg·kg-1, 95.84μg·kg-1, compared with CK were significantly different at 1% level. The As content of rice processing is far lower than the limit As standard, N1Se was 27.32% lower than CK, the difference of 1% significant level; Cd content of rice was 0.194mg·kg-1, almost reached the limit set by the state standards for fair Cd, Cd content of N1Se was 0.116mg·kg-1, was reduced by 67.4% compared with CK, reaching 1% significant level; for N2Se, Cd content was 0.102mg·kg-1, 36.3% lower than N2Se0, and achieved 5% significant level.
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