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超高产和超高产（特）优质大穗型品种的根系发达、伸长快、深生、粗生。新育成的超高产（特）优质品种胜泰１号和奇妙香２号等的单株穗重、单茎穗重、每穗总粒数和实粒数等都达到或超过“早长”超高产大穗型品种特青２号。幼穗分化期的单茎干重除特青２号为１．５１ｇ外，其他大穗型超高产品种都是穗数型高产品种双桂３６的２倍以上，都具有极显著的早长特性。
Ultra-high yield and ultra-high yield (special) high-quality large-spike varieties developed roots, elongation, deep, crude. Newly-bred high-yield (special) high-quality varieties such as Shengtai No. 1 and Qixiangxiang No. 2 have the highest single plant ear weight, single stem ear weight, total spikelet number per panicle and seed number, High yield big spike variety Teqing 2. Spike dry weight of single stem except Teqing 2 1.51g, the other big-spike super high-yield varieties are spike type high-yielding variety Shuangui 36 more than twice, have extremely significant early growth characteristics .