关键词: 水稻, 播期, 品质, 聚类分析, 三江平原

Abstract:

Through sowing date test, the rice quality characters of five main cultivars in Sanjiang Plain were analyzed. The results showed that, the sowing date had effect on head milled rice rate, chalky rice rate, chalkiness degree, amylose content, protein content and taste value, but had little effect on brown rice rate and milled rice rate. With the delay of sowing date, the head rice rate decreased and the appearance quality deteriorated, and there was a significant negative correlation between them; the amylose content increased, while the protein content decreased; the change of taste value varied with varieties. Cluster analysis of coefficients of variation of quality traits showed that chalky rice rate and chalkiness degree were most affected by sowing date and belonged to sensitive traits; brown rice rate, milled rice rate, taste value, amylose content and protein content were less affected by sowing date and belonged to slow traits; and head rice rate was affected by sowing date was between the two. Generally speaking, early sowing had a positive effect on the overall quality improvement of the five rice varieties, but from the point of taste value, late sowing of early-maturing varieties Longgeng 31 and Longgeng 46 might be more beneficial to the improvement of taste.

Key words:  rice, sowing date, quality, cluster analysis, Sanjiang Plain