不同粳稻品种群体整齐度的比较分析 Ⅱ.超稀植栽培对品种性状及整齐度的影响

The Comparison and Analysis of the Uniformity of the Population in Different Rounel_Grained Rice Varieties Ⅱ.The Influence of Super Sparse Planting to Variety Shape and Properties and Uniformity

对不同插秧方式条件下各品种若干性状及整齐度的研究结果表明，与一般插秧方式（３０ｃｍ×１５ｃｍ）相比，超稀植（３０ｃｍ×３０ｃｍ）时多数品种表现为茎高下降、穗子变长、单株穗数大幅度增加、穗粒数明显提高、空秕率下降、出穗期延迟、谷草比上升、着粒密度增加和产量下降等。但各品种对同一性状的反应并不完全一致，总的来看，变化最大的性状是单株穗数，然后依次为空秕率、穗粒数、着粒密度、谷草比、出穗期、茎高和穗长。超稀植后各性状的整齐度也发生了不同方向的变化，变化最大的性状是穗一次枝梗数，然后依次为单株穗数、茎高、穗长和穗粒数。从供试品种来看，玉丰、北陆１２８和藤系１３８品种稀植后各性状整齐度变化不大，产量在稀植区也最高，说明这３个品种比较适宜稀植栽培，而通３５和吉粳６３品种则与此相反。

Under the conditions of different transplant rice seedlings ways,each variety,several shape and properties and uniformity were studied.The vesuts showed:compared with common transplant rice seedlings ways,when they were in the condition of super sparse planting(30cm×30cm),most varieties showed that the hight of stem lowered,the ears of the grain got long;the number of the ears of single stem of a plant much rose;the number of grains every stem grew much higher;blighted rate lowered;heading stage became late;the rate of rice straw grew high;the density of growing grains increased,yield lowered,but the reation of every variety to the same shape and property were not the same.To sum up,the most changed shape and property were the number of the ears of single stem,and the turns were:blighted rate,the number of the grains each ear,the density of growing grains,the rate of rice straw,heading stage,the hight of stem and the longth of the ear.After super sparse planting,the uniformity of each shape and property also changed to different direction,the most changed shape and property was the number of branch per ear once.Then the turns were the number of the ears single stem,the hight of stem,the longth of the ear,and the number of the grains per ear.From the varieties:Yu Feng,Bei Lu 128 ,TengXi 138,the three varieties′,uniformity of each shape and property was not much changed,after super sparse planting.The yield in the fields of sparse planting was the highest.It showed that:the three varieties were fit for sparse planting,but Tong 35 and Jigeng 63 were opposite.