Study Of Foliar Spraying Selenium Fertilizer On Rice Yield And Quality Formation And Its Physiological Mechanism

In order to confirm the effect of foliar spraying selenium fertilizer on rice yield、quality formation and their physiological mechanism, the rice varieties Ningxiangyou and Hua117 were selected as materials to study their changes of yield、quality、grain selenium content、Se distribution and protection enzyme system、photosynthesis physiology after spraying selenium fertilizer on rice leaf. The results showed that:1. The 1000-grain weight of rice dropped significantly when spraying 300g/666.67m2 Ye Li selenium-rich fertilizer on rice tillering, the early and middle filling stage continuously. The yield dropped significanty when spraying 300g/666.67m Ye Li selenium-rich fertilizer on rice tillering, heading and filling stage continuously, but yield improved significantly when spraying300g/666.67m2 Ye Li selenium-rich fertilizer on rice tillering and heading stage. The measurement of spraying selenium fertilizer can result in decline of rice yield and biomass. organic Se fertilizer affect yield less and Ye Li selenium-rich fertilizer can descend yield significantly.2. The rate of polished rice increased significantly when spraying 300g/666.67m2 Ye Li selenium-rich fertilizer on rice tillering and the early filling stage and the Chalkiness rate dropped when spraying 300g/666.67m2 Ye Li selenium-rich every time. Brown rice rate and head rice rate improved significantly when spraying 300g/666.67m2 Ye Li selenium-rich fertilizer on rice tillering, the early and middle filling stage continuously. Brown rice rate improved、chalkiness rate dropped and starch content improved when spraying Se fertilizer.3. The selenium content in rice root, leaf, stem and grain increased effectively through spraying Ye Li se-rich fertilizer on rice leaf.Excessive amounts of selenium fertilizer will inhibit the selenium absorption of rice root and leaf. Less selenium fertilizer quantity, but more fertilization time can reduce selenium residue in rice stalks. Panicle and white rice with the selenium content of selenium content increases. With the increase of selenium amount, the selenium content in grain and polished rice increased. The content of Se improved when spraying Se on rice leaves, but different Se fertilizer have different affect. The Ye Li selenium-rich fertilizer has less affect on polished rice se content, and organic Se fertilizer, Lingmiao, Xizhiyuan and Fuxiyimiao198 can improve the polished rice se content significantly.4. The Pn、GS of rice improve when spraying 300g/666.67m2 selenium fertilizer in rice tillering and heading stage, the Pn also improve when spraying 150g/666.67m2 selenium-rich fertilizer in rice filling stage. Applying selenium-rich fertilizer on rice filling stage can change fluorescence parameters. F0、Fv、PI all increased when spraying 150 g/666.67m2 selenium fertilizer on filling stage, F0 decrease, but Fm increase when spraying 300 g/666.67m2 selenium fertilizer. Spraying 150 g/666.67 m2 se-rich fertilizer on rice tillering stage can increase PI significantly. Spraying selenium-rich fertilizer cannot change rice Fv/Fm, Fv/F0. Selenium fertilizer can improve the activity of POD、GSH-Px effectively, but make no difference to SOD activity. The activity SOD、POD、 GSH-Px don not change when spraying selenium fertilizer.