Studies on the Characteristics of High-yield and High-quality Ratooning Rice Varieties in the Middle and Lower Reaches of the Yangtze River
To explore the types,agronomic and physiological characteristics of high-yield and high-quality ratooning rice varieties suitable for planting in the middle and lower reaches of the Yangtze River,four rice types of early indica conventional rice(EIR),early-maturing indica hybrid rice(EHR),mid-maturing indica hybrid rice(MHR)and indica-japonica hybrid rice(IJR)were used as test materials to compare the yield and its components,agronomic and physiological indexes of key populations,and grain quality of different types of varieties in the main and ratoon seasons.The results showed that when MHR was planted as ratooning rice,the average yield of the main season and the ratoon season was the highest,which was 8.3 and 4.3 t/hm2,respectively.In the main season,the average leaf area index at panicle initiation stage(7.84),the average crop growth rate(CGR)from heading stage to harvest stage[19.63 g/(m2·d)]and the average non-structural carbohydrate content of stem and sheath at heading stage(201.6 mg/g)of MHR were higher than those of other types of rice varieties.In the ratoon season,the average dry matter weight(10.00 t/hm2)in the mature stage,the average CGR[15.18 g/(m2·d)]from the harvest stage of the main season to the heading stage of the ratoon season,and the average non-structural carbohydrate accumulation in the stem and sheath at the heading stage of the ratoon season(25.8 g/m2)of MHR were higher than those of other types of rice varieties.From the perspective of grain quality,the amylose content of the main season rice was better than that of the ratoon season rice.The head rice rate,chalky grain rate and chalkiness of the ratoon season rice were better than those of the main season rice.The main grain quality traits of MHR were better than those of EIR and IJR.In conclusion,MHR is a high-yield and high-quality ratooning rice variety type in the middle and lower reaches of the Yangtze River.
万方数据
维普
