Analysis on Yield and Quality of Late Indica Rice Varieties Approved in Southern Guangxi from 2014 to 2023
The South China double-cropping rice region is one of the key ecological areas for rice production in China.Guangxi,as an important part of the South China double-cropping rice region,contributes nearly 10％of the national total rice output.The rice-growing area in southern Guangxi is the main double-cropping rice area in Guangxi with suitable ecological conditions.The late indica rice area is the main high-quality rice producing area in Guangxi.Therefore,the yield and quality characteristics of late indica rice varieties approved in recent years were analyzed in order to provide scientific and accurate guidance for the future breeding of late indica rice in Guangxi.This study systematically analyzed and summarized the yield and quality characteristics of late indica rice varieties approved in the southern Guangxi rice planting area in the past 10 years.The results showed that a total of 386 late indica rice varieties were approved in the southern Guangxi rice planting area from 2014 to 2023.The average annual yield of the approved varieties ranged from 7 338.60 to 7 948.65 kg/hm2,which was about 5％higher than that of the control varieties.There was no significant improvement in yield characteristics between the previous years.The number of thermosensitive varieties gradually increased,while the number of photosensitive varieties gradually decreased,and approximately 70.50％of the photosensitive varieties were weakly-photosensitive varieties.The grain quality was improved year by year,and the proportion of high-quality rice varieties reaching the ministry standard or national standard increased to 90.91％in 2023.In terms of appearance quality,compared with 2014,the chalkiness in 2023 decreased by 57.5％,and the length-to-width ratio increased by 19.11％.In terms of eating quality,the gel consistency decreased slightly,the amylose content was basically stable,and the alkali spreading value increased steadily,showing a trend of softening and better palatability as a whole.In general,the number of new late indica rice varieties in the southern Guangxi rice planting area showed an explosive growth,and the thermosensitive varieties became dominant.Under the condition of stable yield,the grain quality was greatly improved,which made an important contribution to enriching the rice market and ensuring national food security.
万方数据
