Huang Wei, Xu Qingguo, Wu Ning
College of Agriculture, Hunan Agricultural University, Changsha, China.
National Grain Industry (Functional Rice) Technology Innovation Center, Institute of Functional Agriculture, Yulin Normal University, Yulin, China.
Int J Anal Chem. 2022 Dec 17;2022:3101069. doi: 10.1155/2022/3101069. eCollection 2022.
Selenium-rich rape ".1" was used as green manure to study the effects of different amounts of green manure returned to the field on the release characteristics of available selenium in acidic paddy soil in southern China, and to analyze the absorption and transformation of selenium in rice, so as to provide a theoretical basis for planting natural selenium-rich rice in acidic areas of southern China. Six treatments with different amounts of selenium-enriched rapeseed returning (0, 5, 10, 15, 20, and 25 t/hm) were set up. Two rice varieties (selenium-rich rice variety Meixiangzhan 2 and common rice variety Zhongguangxiang 1) were selected. The results showed that (1) with the increase of selenium-rich rapeseed returning amount, the available selenium in soil showed an increasing trend. Over time, soil available selenium showed a significant increasing trend, and the content of soil available selenium reached the maximum at tillering stage, and then decreased. (2) For selenium-rich varieties, when the amount of selenium-rich rapeseed returned to the field was less than 15 t/hm, the selenium content in rice grains increased significantly with the increase of the amount of selenium-rich rapeseed returned to the field, then remained basically stable. For conventional varieties, with the increase of the amount of selenium-rich rapeseed returned to the field, the selenium content of rice grains showed an increasing trend, but the overall selenium content was much lower than that of selenium-rich variety. (3) With the increase of the amount of rapeseed returned to the field, the rice yield had an increasing trend, but the maximum rice yields appeared when the amount of selenium-rich rapeseed returned to the field was 15 t/hm. Therefore, Se-enriched rape returning could promote the release of available selenium in soil and the enrichment of selenium in rice plants, and significantly increase the selenium content in rice. According to the selenium content and yield of rice, it is suggested that the selenium-rich rice variety Meixiangzhan 2 was chosen and the amount of Se-rich rape returning is 15 t/hm.
富硒油菜“1号”被用作绿肥，以研究不同绿肥施用量对中国南方酸性水稻土中有效硒释放特性的影响，并分析水稻对硒的吸收和转化，从而为中国南方酸性地区种植天然富硒水稻提供理论依据。设置了六个不同富硒油菜施用量的处理（0、5、10、15、20和25 t/hm）。选用了两个水稻品种（富硒水稻品种美香占2号和普通水稻品种中广香1号）。结果表明：（1）随着富硒油菜施用量的增加，土壤有效硒呈增加趋势。随着时间的推移，土壤有效硒呈显著增加趋势，土壤有效硒含量在分蘖期达到最大值，然后下降。（2）对于富硒品种，当富硒油菜施用量小于15 t/hm时，稻米中的硒含量随着富硒油菜施用量的增加而显著增加，然后基本保持稳定。对于常规品种，随着富硒油菜施用量的增加，稻米中的硒含量呈增加趋势，但总体硒含量远低于富硒品种。（3）随着油菜施用量的增加，水稻产量呈增加趋势，但当富硒油菜施用量为15 t/hm时，水稻产量最高。因此，富硒油菜还田可促进土壤有效硒的释放和水稻植株对硒的富集，并显著提高稻米中的硒含量。根据稻米的硒含量和产量，建议选择富硒水稻品种美香占2号，富硒油菜施用量为15 t/hm。
