BackgroundA number of field studies have demonstrated that the yield potential of hybrid rice cultivars is higher than that of inbred cultivars, although the magnitude of difference between hybrid and inbred cultivars at different yield levels has not been described. The objective of this study is to compare the yield increase potential at different yield levels between hybrid and conventional rice. Ten field experiments were conducted at five locations in southern China in 2012 and 2013. At each location, two hybrid and two inbred cultivars were grown at three N levels: high (225 kg/hm2), moderate (161–191 kg/hm2) and the control, zero N (0 kg/hm2).
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机译：背景技术许多田间研究表明，杂交水稻品种的产量潜力比自交品种更高，尽管尚未描述杂交和自交品种在不同产量水平下的差异幅度。这项研究的目的是比较杂交稻和常规稻在不同产量水平下的增产潜力。在2012年和2013年，在中国南方的五个地方进行了十次田间试验。在每个地方，两个杂交品种和两个自交系品种在三个N水平下生长：高（225kg / hm 2 ），中等（161-191 kg / hm 2 ）和对照，零N（0 kg / hm 2 ）。
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