| Effect of sowing date on winter wheat yield and yield composition in Jiangsu Province |
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| DOI：10.7606/j.issn.1000-7601.2020.04.37 |
| Key Words: sowing date spike number climate change late\|sowing meta\|analysis |
| Author Name | Affiliation | | YAN Huimin | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China | | ZHOU Mingrui | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China | | XU Zhipeng | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China | | Wang Qingyi | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China | | LIU Jianfeng | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China | | ZHOU Yangyang | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China | | WANG Naijiang | Institute of Water\|Saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | DING Dianyuan | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
2. Institute of Water\|Saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Winter wheat sowing date in Jiangsu Province was taken as the main research object. Field experimental data for sowing dates of winter wheat came from references within recent 20 years. The data was grouped according to delayed time in sowing, wheat cultivar, planting regions, and growing years. Then, the meta\|analysis method was used to quantify effects of sowing date changes on winter wheat yield and yield composition. The results showed that the sowing date in Jiangsu Province in the past 20 years showed a delaying trend with 5.5 d·10a-1. Winter wheat in northern Jiangsu and southern Jiangsu began to decrease in yield after 18~22 d of late sowing, and winter wheat in central Jiangsu began to decrease in yield after 23~27 d of late sowing. Compared with yields of the normal sowing date, wheat yields with sowing date delayed 13~17 d had a significantly increasing trend with a 3.1% yield increase (95% confidence interval, 0.4%~5.8%), and wheat yields showed a significant decreasing trend when the sowing date was delayed more than 18~22 d. With the development of the year, the effect of late sowing on yield reduction appears earlier and earlier. From 2000 to 2010, the trend of production reduction began to appear after 23~27 d of late broadcasting; From 2011 to 2017, the trend of production reduction began to appear after 18~22 d of late broadcasting. The yield of (weak) spring winter wheat began to decrease after 18~22 d of late sowing, while that of (semi) winter wheat decreased after 8~12 d of late sowing, and the selection of winter wheat tended to be vernalization. In the data of meta\|analysis, yields of winter wheat was highly dependent on spike number (P<0.05,R2=0.3116). The spike number of winter wheat played a dominance role in yield composition when the sowing date was delayed. Late\|sowing of winter wheat could be used to adapt with climate change in Jiangsu Province. |
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