Abstract:

To study the variation rule of grain filling and dehydration rate of Shanxi sorghum varieties of different ages along with the change of age, 10 sorghum varieties of different ages were used as experimental materials. The water content, grain-filling and dehydration rate of the 10 sorghum hybrids of different ages were calculated according to the relevant statistical software and formulas, and the significance test was carried out for data analysis. The significance analysis showed that the grain wet weight and the grain dry weight and the grain moisture were significantly different among different models and different days. On the 45^th day, most grain moisture was from 17% to 20%, and only that of ‘Jinza 4’ and ‘Kangsi’ were slightly low. The grain dry weight and the dehydration rate and grout filling rate did not change significantly among stages. The increasing rate of grain dry weight was the slowest in 25-35 days. With the change of age, the dehydration rate of each variety decreased gradually at mature stage. The grain filling rate of the 10 materials showed a downward trend in 25-35 days. The grain filling rates of the modern varieties were slightly higher than old varieties. Correlation analysis showed that the yield was significantly and negatively correlated with the dehydration rate in 35-45 days. Selecting varieties with faster grain filling rate at early middle stage and relatively fast grain dehydration rate at later stage was the key to improve grain quality and stable yield. ‘Jinza 1’, ‘Jinza 4’ and ‘Jinza 12’ are the varieties with faster grain-filling rate in this experiment.

Key words: sorghum, age, grain filling rate, dehydration rate, correlation