Effect of silicon and iron on the growth and phosphorus uptake of rice

• Main Authors: LIU Yu-chun, LI Ren-ying, XIE Xiao-jin, LI Lin, XU Xiang-hua, ZHANG Qi, WU Si-jia, JIAN Jing, LI Yu-cong
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2020-07-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: iron, iron plaque, rice, silicon, phosphorus
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2020/4/20200408.htm

In order to provide important information for improving the utilization efficiency of phosphorus (P) fertilizer, the effect of silicon (Si) (0, 1, 4 mmol&#183;L^-1) on the growth and P uptake of rice, under iron (Fe) (0, 0.5, 1, 2 mmol&#183;L^-1) pretreatment, was studied using hydroponic experiments. The results showed that pretreatment with low concentration Fe did not significantly affect rice SPAD, plant height, root length and shoot dry weight, but these indexes were significantly decreased under pretreatment with high concentration Fe (<i>P</i><0.05). Although the application of Si increased plant height, root length, and shoot dry weight of rice to some extent, it was not significant (<i>P</i>>0.05). Fe pretreatment significantly increased the amount of iron plaque on the root surface of the rice and the phosphorus concentration sequestrated on the iron plaque of the root surface (<i>P</i><0.05). The application of Si significantly reduced the amount of iron plaque on the root surface under pretreatment with 0.5 mmol&#183;L^-1 and 1 mmol&#183;L^-1 Fe (<i>P</i><0.05). Fe pretreatment did not significantly affect the phosphorus concentration in rice roots, but significantly reduced the phosphorus concentration in the shoots (<i>P</i><0.05). Silicon application did not significantly affect the phosphorus concentration in rice roots or shoots. Our results indicated that Fe pretreatment induced, significantly, the appearance of iron plaque on the root surface, increased the phosphorus sequestration on iron plaque and significantly reduced the phosphorus concentration in the shoots. Silicon application alleviated Fe toxicity during rice growth to a certain extent, and could affect the uptake and translocation of phosphorus by changing the amount of iron plaque on root surfaces and reducing the root-shoot ratio.