Abstract:

To find out the enrichment characteristics of functional elements of selenium, zinc and iron in rice, which have great influence on human health, and promote the development of functional agriculture, the leaf surface application of selenium (A₁, A₂, A₃, A₄ and A₅) was carried out on the leading hybrid high quality rice ‘Yexiang Youbasi’ (B₁) and conventional high quality rice ‘Baixiang 139’ (B₂) by split zone design. The results showed that the experimental treatment significantly increased the selenium content of rice and rice straw. The average selenium content of B₂ rice was significantly higher than that of B₁ by 17.2%. There was no significant difference in the average selenium content of rice straw between B₁ and B₂. B₁ rice had a stronger tolerance to high exogenous selenium stress than B₂, and B₂ rice straw had a stronger tolerance to high exogenous selenium stress than B₁. The interaction effect of A₄×B₂ and A₄×B₁ (applied 1.5 times selenium) on the difference in selenium content between B₁ and B₂ rice was extremely significant. A₁×B₁ and A₁×B₂ (without selenium application) had no significant effect on the difference in selenium content between B₁ and B₂ rice, indicating that exogenous selenium had an impact on the difference in selenium enrichment between rice varieties (combinations). Foliar application of selenium had no significant effect on the zinc and iron content of rice, but increased the difference in zinc enrichment between B₁ and B₂ rice and reduced the difference in iron enrichment between B₁ and B₂ rice. This suggested that exogenous selenium also had an impact on the differences in zinc and iron enrichment between rice varieties (combinations). B₁ rice had significantly stronger zinc enrichment than B₂ rice, while B₁ and B₂ rice had comparable iron enrichment. Exogenous selenium had different effects on the enrichment of selenium, zinc and iron in rice, and also affected the difference in the enrichment ability of selenium, zinc and iron among rice varieties. It was worth paying attention to the evaluation and screening of rice varieties (combinations) rich in selenium, zinc and iron.

Key words: selenium dosage, variety (combination), interaction, selenium, zinc and iron elements in rice, rice, straw, Guiping City