Variation coefficients of grain chalkiness, translucency and chalkiness were high, but those of brown rice rate, milled rice rate and head rice rate were low.
糙米率、精米率、粒长和长宽比的变异系数较小，垩白米率、透明度和垩白度的变异系数较大。
Reducing chalky grain and increasing head rice rate were important in japonica rice quality improvement. (3) The quality of indica hybrid rice was improved significantly.
垩白、整精米率和直链淀粉含量是籼稻品质改良的重点，垩白和整精米率是粳稻品质改良的重点。
The rates of brown, milled and head rice increased while chalky rice rate and chalkiness decreased in interplanting with zero tillage.
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。
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