【摘要】 通过对6个品种的分期播种试验,研究了稻米品质性状在播期间和年季间的变异特征。通过对各播期米质性状的综合评定得出,沈农315、奥羽316和沈农9457适于推迟播期到第2期或第3期;垩白是辽宁省地区推迟播期、品质改良的关键因素,垩白度较高的品种随着播期延迟垩白度显著降低,相反则升高;温度因子中灌浆结实期的日较差和齐穗后的有效积温对品质性状影响较大;品种的灌浆速率与垩白度有较大关系,而播期对灌浆速率影响很大。更多还原

【Abstract】 Based on the experiment with 6 varieties and 4 sowingdates, the variable parameters of rice quality traits among sowingdates and years were analyzed. The results showed that Shennong 315, Oou 316 and Shennong 9457 adapted to delaying sowing through general evaluating for the qualities of different sowingdates. Chalkiness was the main reason for postponing sowingtime and quality im-proving rice in Liaoning Province. The chalkiness degree of the varieties decreased with postponement of sowingtime. Daily temperature difference in filling period and effective accumulation temperature after heading had large effects on the quality. There were some rela-tionships between filling rate and chalkiness.更多还原