Severe drought could lower the metabolic activities in the kernels, and it was no good to the transportation and partition of photoassimilates into the kernel sink.
而严重干旱会降低籽粒的代谢活性，不利于同化物向籽粒库转运分配。
Sufficient nitrogen supply during grain filling period promoted kernel growth by improving carbon-nitrogen metabolism and sink activity of kernels.
整个灌浆期氮素供应充足提高了籽粒库活性和碳氮代谢水平，促进了籽粒库容建成和库充实；
The contribution of kernels to yield is decreased by sink-limiting treatment. However, the contribution of kernels number and kernel weight exceeds the number of ear in the source-reducing treatment.
限库处理降低穗粒数对产量的贡献，减源处理下穗粒数和粒重对产量的贡献超过穗数。
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