3种生长抑制剂对多花黑麦草种子产量的影响  

Effects of the application of three growth regulators on seed yield of Lolium multiflorum

作　　者：孙旭春 顾洪如[2] 张霞[2] 董臣飞[2] 许能祥[2] SUN Xuchun;GU Hongru;ZHANG Xia;DONG Chenfei;XU Nengxiang(Animal Husbandry Technology Extending Stations of Linxia,Linxia 731100,Gansu,China;Institute of Animal Science,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,Jiangsu,China)

机构地区：[1]临夏州畜牧技术推广站,甘肃临夏731100 [2]江苏省农业科学院畜牧研究所,江苏南京210014

出　　处：《草业科学》2018年第8期1959-1964,共6页Pratacultural Science

基　　金：国家牧草产业技术体系(CARS-35);国家科技支撑计划(2011BAD17B02)

摘　　要：多花黑麦草(Lolium multiflorum)为南方优质的禾本科牧草,由于其在收获期易倒伏,种子产量较低,而生产中应用植物生长抑制剂可调节植物生长,降低倒伏率,提高种子产量。为此选用3种生长抑制剂对多花黑麦草进行喷施,结果发现,多花黑麦草生殖枝数增加,穗长缩短(多效唑除外),倒伏率降低,种子实际产量增加。当多效唑施药量为200g·hm^(-2)时,种子实际产量最高,为2 267kg·hm^(-2),较对照提高了3%;抗倒酯施药量为423g·hm^(-2)时种子实际产量最高,为2 842kg·hm^(-2),较对照提高了29%;稀施保施药量为1 770 mL·hm^(-2)时种子实际产量最高,为2 508kg·hm^(-2),较对照提高了14%。3种生长抑制中,抗倒酯药效持续时间较长,在抑制节间长度、防止倒伏方面效果显著,增产效果最好。Italian ryegrass(Lolium multiflorum)is an important Gramineae forage that is mostly planted in southern areas with high production and good feeding quality.However,its lodging during the filling period seriously reduces seed yield.Growth regulators might decrease the lodging rate,thus increasing seed yield.In this study,three growth regulators(paclobutrazol,trinexapac-ethyl,and maize roborant)were used at the jointing stage.The results indicated that all three growth regulators increased the number of reproductive branches,reduced ear length(except paclobutrazol)and lodging rate,and finally increased seed yield.Compared with that of the control,the seed yield of 200 g·ha-1 Paclobutrazol treatment,423 g·ha-1 trinexapac-ethyl treatment,and 1 770 mL·ha-1 maize roborant treatment were higher by 3%,29%,and 14%,respectively.Among the three regulators,the effect of trinexapac-ethyl lasted the longest and had the best effect on shortening the internode length,increasing resistance to lodging,and increasing seed yield.

关 键 词：多花黑麦草 多效唑 抗倒酯 稀释保 种子产量构成因子 倒伏 种子产量 

分 类 号：A816[哲学宗教—马克思主义哲学] S543.6[农业科学—作物学]