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Intercepted solar radiation (ISR) of winter wheat with narrow-drill sowing (NDS) and wide-belt sowing (WBS) in two growing seasons. Data are means and error bars are SE (n = 4). The dashed reference line indicates that the difference percentage in ISR between WBS and NDS is zero. The * and ** indicate there is significant difference between WBS and NDS at the same seed rate, according to Student’s t-test at α = 0.05 and 0.01, respectively.
