The test adopted the optimum test design of 4 factors, probed into the source and sink characteristic of the high yield maize and relation with yield in cold region.
试验采用4因素最优试验设计，探讨寒地高产玉米的源库特点及其与产量的关系。
The key to break through the yield is to promote sink, sources, and flow.
产量突破的关键是扩库、增源、畅流。
There is no significant reciprocal action, between scion and stock after grafting, so we can use the root sink capacity to determine the yield of different varieties.
嫁接后，砧木与接穗之间交互影响不显著，可以利用甘薯库鉴定品种产量高低。
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