为了探讨光敏型高丹草种植中影响产草量的主要农艺性状,在陇东黄土高原旱作区以免耕露地穴播、翻耕露地穴播、翻耕覆膜穴播3种方式种植光敏型高丹草(包括海牛、大卡、BJM三个品种),并对8个主要农艺性状与产草量之间的相关性进行因子分析.结果表明:不同栽培方式下影响产草量(X9)的因子不同,产草量(X9)在免耕露地穴播时与株高(X1)、节数(X3)、叶片数(X4)和分蘖数(X8)呈正相关;翻耕露地穴播时与茎粗(X2)、单株鲜重(X5)和单株茎重(X7)呈正相关,与株高(X1)和节数(X3)呈负相关;翻耕覆膜穴播时与叶片数(X4)和分蘖数(X8)呈正相关,但与株高(X1)的相关性不明确;同时,高产高丹草的主要特征包括茎粗、单株产量高、分蘖少等,BJM较其他两品种更符合该特征.综上所述,在陇东黄土高原旱作区种植光敏型高丹草时,以BJM与翻耕覆膜穴播结合为最佳栽培方式,可获得较高的产草量.%To find the main agronomic characters which would affect the yield,3 types of photoperiod-sensitive sorghum-sudangrass hybrids,Monster,BJM and Big kahuna,were planted by 3 dibbling methods,no tillage without mulching,tillage without mulching and tillage with plastic mulching in the dry farming area of the loess plateau in Longdong,and the factor analysis of the correlation between 8 main agronomic characters and yield was done. The results showed that the factors affecting yield were different in each mode,the yield was positively correlated with plant height(X1),section number(X3),leaf number(X4)and tiller number(X8)by no tillage without mulching;positively correlated with stem diameter(X2),plant weight(X5)and stem weight(X7),and negatively correlated with plant height(X1)and section number(X3)by tillage without mulching; at the same time,the yield was just positively correlated with leaf number(X4)and tiller number(X8)while the correlation between yield and plant height is not clear by tillage with plastic mulching. In the meantime,the main characteristics of photoperiod-sensitive sorghum-sudangrass hybrids included a thicker stem,a higher yield of single plant,and lower tillering,etc.,and BJM was more consistent with these features than the others. As a conclusion,when photoperiod-sensitive sorghum-sudangrass hybrids were planted in the dry farming area of the loess plateau in Longdong,a more robust variety dibbled with tilling would be chosen and the higher yield would be gotten.
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