Abstract: Using the low-glycemic index (GI) functional rice cultivar Tangyou 1 as the test material, field plot experiments were conducted in Wuhan City and Ezhou City of Hubei Province to investigate the regulatory effects of key cultivation measures (including different sowing dates, planting densities and fertilizer regimes) on its agronomic traits and yield components, so as to provide a basis for the construction of a standardized cultivation technology system for the low-GI functional rice Tangyou 1. The results showed that the optimal sowing date for Tangyou 1 in Hubei rice-growing regions was mid-to-late June. Delayed sowing (early July) led to insufficient temperature and light resources, which reduced the number of effective panicles, grains per panicle and seed setting rate of rice, and caused a 13.8% yield decline. Moderately increasing planting density and reducing nitrogen fertilizer input could not only achieve a slight yield increase (3.6% growth) for this cultivar, but also improve fertilizer use efficiency, avoid pollution risks from excessive fertilization, and meet the requirements of green agricultural production. In addition, organic water-soluble fertilizer significantly increased the number of effective panicles, panicle length, filled grains per panicle and seed setting rate, optimized the yield structure, and thus realized a yield increase of 21.5%-26.9%.

Key words: low-GI functional rice, Tangyou 1, cultivation measures, sowing date, density, fertilizer, agronomic traits, yield