[Sowing date of corn in semiarid region of Jilin Province, Northeast China in adapting to climate change].

Under the background of global climate change,the climate in semiarid region of west Jilin Province changed greatly,producing a profound impact on the corn production in this region.In this study,the corn seeds were under three treatments (accelerating germination at 10 and 25 ℃,and dry seeds),and a field experiment with early sowing and traditional sowing was conducted in 2008 to investigate the effects of early sowing these seeds on the seedling emergence,growth,and yield,and compare the effects of early sowing and traditional sowing dates on the corn production and yield.In 1961-2010,the first day of the growth season of corn in semiarid region of west Jilin Province was advanced,the air temperature increased significantly,and the precipitation displayed a decreasing trend.At present,the corn sowing date in this region could be advanced to 11 th,April.Accelerating germination at 10 ℃,directly sowing dry seeds,and bed-irrigation sowing all benefited the seedling emergence and cold resistance of early-sown seeds,and the corn plant height and leaf area under early sowing were significantly higher,with the yield increased by 35%-48%,compared with those under traditional sowing.