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关键词:  水稻  土壤施硒  叶面喷施  生物强化  营养品质
Effects of Different Selenium Application Methods on Se Utilization Efficiency of Rice
ZHANG Chengming and ZHOU Xinbin
College of Resource and Environment, Southwest University,College of Resource and Environment, Southwest University
【Objective】 Application of Se fertilizer is an important agronomic rice Se biofortification measure, and is usually done in two ways, i.e. foliar spray (FS) and application in soil (SA). However, as affected by the way of Se application, Se absorption and translocation of Se into rice grain varies in mechanism. Therefore, it is of great practical significance to study the differences between the two Se application methods in effect on Se absorption and translocation and nutritional quality of rice. 【Method】 A pot experiment was conducted to study mechanisms of FS and SA affecting Se biofortification and nutritional quality of rice grains. 【Result】 Results show that the two methods did not vary much in effect on rice growth. The same in Se application rate, the two methods both increased Se content in rice shoot and grain significantly. However, the content of Se in rice shoot and grain was 8.9 and 5.3 times as high in SA as in FS, respectively, which indicates that SA could more effectively increase Se content in rice grain than FS. But the distribution coefficient of Se in grain was 2 times higher in FS than in SA, which demonstrates that the mechanism of transporting Se from leaf into grain was more effective than that from root to grain. However, no significant effect on Se form in rice grains relative to Se application method, which indicates that Se application methods affected only transport, rather than assimilation of Se in rice. SA could significantly increase the contents of magnesium (Mg), sulfur (S), iron (Fe), manganese (Mn) and zinc (Zn) in rice grain. Compared with the control (No Se applied), SA and FS was 8% and 4.5% higher in content of crude protein in rice grain, respectively, which shows that Se can improve nutritional quality of rice, and the effect of SA was more significant than that of FS. Meanwhile, Se application can also increase the content of serine (Ser) and tyrosine (Tyr) as compared with CK, and, the effect on Tyr was more significant in SA than that in FS or 1.15 times as higher in the former than in the latter. 【Conclusion】Therefore, considering cost-effectiveness, SA is better than FS in applying selenate, for it improves more significantly Se content and nutritional quality of rice grains.
Key words:  Rice  Soil selenium application into soil  Foliar selenium application  Biofortification  Nutritional quality