不同播种期对宜优673产量及稻米品质的影响

Effect of Sowing Date on Yield and Rice Quality of Yiyou 673

以宜优673为材料,通过分期播种试验,研究不同播种期对产量和稻米品质性状的影响。结果表明,宜优673的产量随播期推迟呈先增后减的趋势,5月20日播种产量最高,6月20日播种产量最低;随播种期推迟,灌浆结实期日均温的降低,宜优673的整精米率、透明度和直链淀粉含量提高,而垩白度、垩白粒率降低,理化指标得分逐步上升,稻米品质逐步提升。因此,在保证安全抽穗的前提下,适当推迟播种期有利于提高宜优673的稻米品质。

Interval sowing date experiment was executed with Yiyou 673 as testing material to explore the variation of yield and rice quality under different sowing dates. The results showed that the yield was firstly ascended and then declined gradually with the delayed sowing dates of rice. The yield of Yiyou 673 was the highest when it was sowed on May 20~h. But when it was sowed on June 20＇h , the yield was the lowest. Head milled rice rate, translucent endosperm, amylase content, and scores of physicochemieal index were increased with the delayed sowing date and the reduced average temperature during filling stage. At the same time, chalky rice rate and chalkness rate were reduced. So, on the basis of the full heading time, it is beneficial to improve the quality of rice with suitably delayed sowing date of Yiyou 673.