关键词: 水解度, 水解度

Abstract: In recent years, due to global warming and one-sided pursuit of high yield, the phenomenon of cross one planting is getting worse in maize production. In order to stop cross zone planting, avoid long growth period varieties, ensure safety ripen, and improve yield and commercial quality of grain of maize, the different yield and related characters of maize varieties has been researched in the early matured district of Shanxi Province for 4 years from 2010 to 2013. The results showed that, the yield of middle matured varieties were higher in the year which hydrothermal condition was better than common year, but had no significant difference in contrast with early matured varieties (P＜0.05). In early frost year, yield and hundred- grain weight of middle matured varieties were significantly lower than that of early matured varieties (P＜0.01), and the average decrease was 10.2% and 16.3%, respectively，the harvest index and grain produce index also decrease significantly. Although the harvest index and water use efficient of the earliest matured maize varieties were more higher than common varieties, the yield were low and ripen date was 25-28 days earlier than early frost in common year, and about 300-400℃ active accumulated temperature which was ≥10℃ was not been used efficiently, and resulted in the loss of light and water and heat. Therefore, under comprehensive consideration of the safety ripeness, high and stable yield and high quality and efficient use of resource, the early matured varieties were better than middle matured and the earliest matured varieties, and were more suitable for promotion in this area.