| 【Objective】The study was conducted to explore the comprehensive effects of nitrogen and phosphorus
regulation on the yield and quality of hybrid rice, and the response of rice quality of high-quality rice varieties to nitrogen
and phosphorus regulation under environmental conditions in Sichuan rice region.【Method】The hybrid rice Deyou
4727 was treated with 4 levels（0, 90, 150, 270 kg/hm2
）of nitrogen and 4 levels（0, 30, 60, 120 kg/hm2
）of phosphorus.
The grain yield characters, milling quality, appearance quality, taste value, RVA profile characteristic value and amylose
content were determined to explore the response of grain yield and quality to nitrogen and phosphorus regulation.
【Result】With the increase of nitrogen fertilizer application rate, the yield of Deyou 4727 increased significantly, and
the yield reached the maximum under the condition of 270 kg/hm2
, while the effect of phosphate fertilizer on rice yield was not significant. The effects of nitrogen fertilizer and phosphate fertilizer treatments on milling quality and appearance quality
reached significant or extremely significant levels: with the increase of nitrogen fertilizer application rate, the brown rice rate,
chalkiness and chalky grain rate of Deyou 4727 showed a trend of first decreasing and then increasing. The polished rice rate
showed a decreasing trend, and the head rice rate first increased and then decreased. Phosphate fertilizer application could
increase the brown rice rate, polished rice rate and head rice rate of Deyou 4727, and reduce the chalkiness of rice. There
was a significant correlation between the application of nitrogen fertilizer and phosphate fertilizer and rice cooking and eating
quality: nitrogen fertilizer had a very significant positive correlation with paste temperature, and a very significant negative
correlation with amylose content; phosphate fertilizer had an extremely significant negative relationship with peak viscosity,
hot paste viscosity and cold paste viscosity, and a significant negative relationship with the disintegration value. With the
application of nitrogen fertilizer, Deyou 4727 significantly reduced the eating quality, which decreased by 4.37%, 10.90%
and 12.13% respectively under the low, medium and high nitrogen treatments.【Conclusion】By appropriately increasing
the application amount of nitrogen fertilizer and controlling the input of phosphate fertilizer at the same time, better quality
can be obtained under the premise of ensuring the yield of rice. |
