Abstract:

To obtain the most suitable sowing time for rice ‘Yongyou 15’, we conducted the experiment of sowing by stages, aiming to improve the yield and quality of the variety. According to the sowing data of ‘Yongyou 15’ by stages from 2016 to 2020 in Longyou National Agricultural Meteorological Experimental Station and the rice quality data from 2018 to 2019, the relationship between the yield, quality and the sowing time of ‘Yongyou 15’ was obtained through comparative experiment. The results showed that: (1) the sowing time had certain influence on the days of full growth and grain filling stage of ‘Yongyou 15’, mainly, the later the sowing time, the fewer the days of the full growth and the longer the grain filling stage; (2) 22℃ was the threshold of normal development of rice at grain filling stage, and the average temperature below 22℃ could obviously increase the time of the grain filling and milking stage; (3) the amylose content of ‘Yongyou 15’ was generally about 10%, which was easy to gelatinize, the protein content was close to 7%, and the taste and nutrition content were relatively balanced; (4) when the sowing time was postponed to mid-June, the yield and quality of ‘Yongyou 15’ decreased significantly; (5) the sowing time of ‘Yongyou 15’ should be from late May to early June, which could obviously improve the yield of single-cropping rice in Longyou.

Key words: rice, sowing by stages, ‘Yongyou 15’, grain filling stage, rice quality