异型莎草影响早稻产量的预测模式  

A STUDY ON CALCULATION MODEL OF THE EFFECT OF SMALL-FLOWER UMBELLAPLANT ( Cyperus difformis L. ) ON YIELD LOSSES OF EARLY RICE

作　　者：喻如俊[1] 

机构地区：[1]上海市农业科学院植物保护研究所,上海201106

出　　处：《上海农业学报》1992年第1期58-62,共5页Acta Agriculturae Shanghai

摘　　要：在相同的栽培条件下,早稻产量的损失主要受异型莎草穴夹率(x_1)及其分蘖株数(x_2)两个因子的影响。夹草率高、异型莎草分蘖株数多,则早稻产量损失随之增加。早稻分蘖末期,产量损失率预测模式为y=1.6463+0.6554x_1+0.0348x_2;早稻抽穗期,产量损失率预测模式为y=1.6779+0.6672x_1+0.0366x_2。经检验,两个预测模式的平均误差率分别为12.4％和11.7％。大田应用结果(1984—1986年)表明,预测式的准确率达81.8％。Under the same fertillization and irrigation condition the main factors causing the yield losses of early rice were the rate of mingled C. difformis plants (x_1) and the number of their tillers (x_2). The higher the rate and the more the tiller number of the weed, the more yield losses of the early rice occurred.To calculate the rate of yield losses at the final stage of rice tillering, an equation should be expressed as. y =1.6468+ 0.6554x_1 +0.0848x_2 and the equation, y =1.6779 + 0.6672x_1 +0.0868X_2 shall be used at heading stage of early rice. Through the inspection of the data, the average error pereentages of the two ealeulation equations were 12.4％ and 11.7％, respectively. The results of application in fields indicated that the correctness value was up to 81.8％

关 键 词：早稻 异型莎草 预测模式 分蘗末期 

分 类 号：S511.310.1[农业科学—作物学]