柳叶刺蓼对玉米生长的影响及其经济阈值研究  

Effects of Polygonum bungeanum on Growth of Maize and Its Economic Threshold

作　　者：崔娟[1] 李旋 许喆 唐佳威 董莉环 吴磊 史树森[1] CUI Juan LI Xuan XU Zhe TANG Jia-wei DONG Li-huan WU Lei SHI Shu-sen(College of Agronomy, Jilin Agricultural University, Changchun 130118 Agricultural Technology Extension Center of Huairen County, Benxi 117200 Agricultural Technology Extension Station of Changchun City, Changchun 130033, China)

机构地区：[1]吉林农业大学农学院,长春130118 [2]辽宁省本溪市桓仁县农业技术推广中心,辽宁桓仁117200 [3]长春市农业技术推广站,长春130033

出　　处：《玉米科学》2017年第5期141-144,151,共5页Journal of Maize Sciences

基　　金：现代农业产业技术体系建设项目(CARS-04)

摘　　要：柳叶刺蓼是吉林省春玉米田的恶性杂草,严重危害玉米生长发育,降低玉米产量。在大田条件下采用添加柳叶刺蓼密度系列试验和拟合函数关系模型方法,研究柳叶刺蓼与玉米的竞争关系。结果表明,在柳叶刺蓼的竞争干扰下,玉米株高、茎粗、穗长、单穗重、百粒重及产量均随柳叶刺蓼密度的增加而降低,空秆率增加。幂函数y=2.947x^(0.855)能较好地拟合玉米产量损失与柳叶刺蓼密度之间的关系(R^2=0.983;F=287.355;P=0.000 1)。玉米田柳叶刺蓼人工除草的经济阈值为3.97~5.02株/m^2,90%莠去津可分散粒剂或20%氯氟吡氧乙酸乳油化学防除柳叶刺蓼的经济阈值分别为0.45~0.58和0.53~0.67株/m^2。Polygonum bungeanum, a malignant weed, seriously damaged spring maize growth and reduced maize yield in fields. A field experiment was carried out to study the effects of P. bungeanum of different densities （0, 5, 10, 15, 20, 25 and 30 plant/m2） on the maize growth and yield by the method of additive series experiment. The results showed that increasing density of P. bungeanum significantly reduced maize plant height, stem diameter, ear length, ear weight, 100-grain weight and yield, but the empty stem increased. The power function model was the best in describing the relationship between P. bungeanum density and yield loss as y=2.947x0.855（R2=0.983; F= 287.355; P=0.0001）. Economic threshold of P. bungeanum control was 3.97-5.02 plants/m2 for manual weeding, while for the chemical herbicides of 90% atrazine DC, 20% fluroxypyr EC were 0.45-0.58 and 0.53-0.67 plants/m2, respectively.

关 键 词：玉米 柳叶刺蓼 经济阈值 

分 类 号：S435.131[农业科学—农业昆虫与害虫防治]