施钾量对超高产早稻品种产量和稻米品质的影响

Effects of Potassium Application Rate on Yield and Quality of Superhigh-yielding Early Rice Varieties

以超高产水稻品种陆两优996和淦鑫203为材料,在大田条件下研究了不同施钾量对其产量和稻米品质的影响。结果表明,施钾显著提高双季早稻有效穗数、每穗粒数和产量,增加生物产量、促进茎鞘物质运转,提高抽穗期剑叶的气-叶温差和颖花伤流量,降低抽穗后的根系活力衰退值。施钾量与倒1节间大维管束数、茎秆抗折力和稻米蛋白质含量显著正相关。施钾提高了陆两优996的垩白粒率和垩白度,但降低了淦鑫203的垩白粒率和垩白度。在本试验条件下,最适施钾量为180 kg/hm2。

The effects of potassium application rate on the yield and rice quality of two superhigh-yielding early rice varieties(Luliangyou 996 and Ganxin 20) were studied under field conditions.Applying potassium fertilizer could significantly increase the number of effective panicles,grains per panicle and grain yield,and could enhance the biomass,translocation amount of dry matter reserved in the stem and sheath,the difference between air temperature and flag leaf temperature at heading stage,and the bleeding-inte...