不同粳稻品种群体整齐度的比较分析 Ⅲ.不同施氮水平对品种性状及整齐度的影响

The Comparison Analysis for the Uniformity of the Population in Different Roundgrained Rice Varieties Ⅲ The Influence of Different levels of N Fertilizer Applied on Property of Varieties and the Uniformity

对不同施氮水平下参试品种主要性状及整齐度的分析结果表明,与中等肥力(纯氮125kg/hm2)相比,高肥(纯氮225kg/hm2)时多数品种表现空秕率显著上升,谷草比明显下降,单株穗数增加,产量降低,茎变高,穗粒数增加,出穗期延迟,着粒密度增大,穗子略微变长。高氮后各性状的整齐度也发生了不同方向的变化,平均变化幅度最大的是穗长,然后依次为穗粒数、茎高、穗一次枝梗数和单株穗数。从品种来看,吉粳63、下北和通35在高氮后绝大多数性状的整齐度明显下降,产量也大幅度降低,说明这3个品种不宜在高氮水平下栽培,而玉丰、北陆128和长白九号与上述品种相反,高氮后多数性状的整齐度反而提高,产量亦持平或略有增加,因而适宜在较高氮素水平下种植。

With different levels of N fertilizer applied,the property and the uniformity of several varieties were analysed.The results showed:Compare to middle fertilizer(pure N 125 kg/hm 2)when high fertilizer was given(pure N 225 kg/hm 2)the blighted rate of most varieties rised obviously the rate of grain rice straw lowered clearly;the ear per single plant increased;yield lowered;stem height got higher;the number of the grain per ear increased;the heading stage got late;density of growing grains increased;the ears got longer a bit After high level of N fertilizer,the uniformity of different traits changed differently,the length of the ear changed most obviously,then:the number of the grain per ear,the height of the stem,the numbers of the branches of the ear and the number of the single plant ears.From the view of varieties,the traits and the uniformity of Jigeng 63,Xiabei and Tong 35 lowered clearly after high level of N fertilizer,the yield lowered clearly,too.But Yufeng,Beilu 128 and Changbai 9 acted oppositely:the property and the uniformity rised after high level of N fertilizer,the yield was equal or increased slightly,so they fit high level of N fertilizer.