Study on the Effects of Controlled-Release Selenium Fertilizer on Rice Yield, Selenium Content, and Selenium Fertilizer Utilization Rate

Key Points

• To investigate the effects of application timing and rates of controlled-release selenium fertilizer on rice growth and quality.
• Field experiments with rice variety 'Huanghuazhan'
• Two application timings: transplanting and tillering stages
• Three application rates: 600, 900, 1200 g·ha⁻¹
• Comparison to conventional fertilizers
• Controlled-release selenium fertilizer increased rice yield by 6.1% to 23.2%, with the highest increase observed at 900 g·ha⁻¹ during tillering.
• Significant increases in plant height (6.1% to 16.9%) and dry matter accumulation (18.6% to 37.2%).
• Selenium content in grains increased by 967.5%, with a 54-fold increase in brown rice selenium and a 46.2-fold increase in organic selenium.
• Significant reductions in harmful heavy metals cadmium and chromium by 85.1% and 55.6%, respectively.

Abstract