垩白度为稻米外观品质的重要指标之一，其中，垩白是稻米胚乳中白色不透明的部分，为胚乳淀粉粒之间存在空隙引起透光性改变所致。垩白度是稻米中垩白部位的面积占米粒投影面积的百分比。
【Key words】 Rice； Grain position； Chalkiness degree； Chalky grain percentage； Nitrogen；
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2. Effect of high temperature on rice quality and endosperm structureThe high temperature treatment during heading and early grain filling significantly reduced milling quality, shortened the gel consistency, and increased amylose content, chalkiness degree and protein content.
2、高温对稻米品质及胚乳结构的影响抽穗-灌浆早期高温胁迫明显降低了稻米的加工品质,缩短了稻米的胶稠度,增加了稻米的直链淀粉含量、垩白度和蛋白质含量。
参考来源 - 高温对水稻产量与品质的影响及其生理机制·2,447,543篇论文数据，部分数据来源于NoteExpress
适当的早播或晚播可以降低稻米垩白度；
Rice chalkiness degree decreased in timing early or late sowing.
目前南方水稻产区的劣质米主要来自高垩白度的早籼稻。
Presently, the poor quality rice in southern China mainly comes from early indica rice with more chalkiness.
翻耕移栽秸秆还田也能提高整精米率，降低垩白率和垩白度。
Transplanting with plowing and straw manuring also increased the head rice rate and slightly reduced the chalky rice rate and chalkiness.
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