摘要:
以超级稻‘两优616’为材料,研究不同播种期对‘两优616’产量及稻米品质的影响。试验表明:随着播期的推迟,‘两优616’的穗粒数、结实率明显下降,产量也逐步降低,5个播种期中6月4日播种的超级稻‘两优616’产量最高,7月6日播种的产量最低。从稻米品质来看,5个播种期‘两优616’均表现出良好的品质性状,稻米理化指标得分均较高,其中7月6日播种的‘两优616’得分最高;所有播种期‘两优616’糙米率、精米率、整精米率、透明度、碱消值、胶稠度和直链淀粉含量等7项指标全部达到优质标准。试验还表明:随着播种期推迟、灌浆结实期日均温降低,‘两优616’整精米率提高,垩白率减少,垩白度下降,理化指标得分逐步提高,稻米品质得到提升。因此在生产上可以通过适当调整‘两优616’的播种期,在保证产量的前提下使其灌浆结实处在一个相对有利的时期,从而提升‘两优616’的稻米品质,促进超级稻‘两优616’优质高产栽培及其生产上大面积推广运用。
Abstract:
With super rice‘Liangyou 616'as material,effects of different sowing dates on the yield and grain quality were analyzed.The results showed that the yield of Liangyou 616'was declined gradually with low grain number per spike and seed setting rate postponing the sowing date.Among five different sowing dates,the highest yield of Liangyou 616'was gained on 4th June,and the lowest on 6th July.Liangyou 616'showed good grain quality and high scores of physicochemical properties indices under all sowing time treatments,the highest score appeared sowing on 6th July.Seven indices of Liangyou 616',including brown rice rate,polished rice rate,head milled rice rate,translucent endosperm,alkail value,del consistency and amylose content,all reached high quality standard under all treatments.It was also showed that milled rice rate and the scores of physicochemical properties of Liangyou 616'were increased,and the chalkiness ratio was decreased with the delayed sowing date and the low average temperature of grain-filling stage.Therefore by reasonably late sowing of Liangyou616'to control the temperature of rice grain-filling stage,the yield and grain quality could be both improved in large-scale production of‘Liangyou 616'.
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