鲁西南地区鲜食玉米一年两茬种植热量资源利用研究OA

In order to clearly define the theoretical period range of thermal resources of fresh corn planting pattern of two crops per year in southwest of Shandong Province,and to clarify the suitable sowing date and picking period.Through the analysis of daily average temperature from 2020 to 2024,the date of positive sequence stability passing 10 °C and the date of reverse sequence stability passing 15 °C were calculated as the theoretical first day and theoretical end day of fresh corn sowing and picking.Combined with the heat resources required for the growth period of Suyunuo 2,the earliest picking period of the first crop and the latest sowing period of the second crop were deduced.The results showed that the accumulated temperature range of fresh corn was 4 652.5-5 275 °C,and the theoretical days range was 196-230 days.The earliest sowing and picking date of the first crop was March 8-23,June 18-July 3,and the latest sowing and picking date of the second crop was July 12-August 3,October 3-November 4.Considering the effects of high temperature and heavy precipitation,the first crop of fresh corn should be sown as early as possible.The second crop of fresh corn should be protected from waterlogging at the seedling stage.The first crop of fresh corn picking and the second crop of fresh corn sowing should be completed in mid-July.