高粱-苏丹草杂交种产草量与品质性状的回归分析

Regression analysis between forage yield and quality traits in sorghum-sudangrass hybrid

通过对7个高粱-苏丹草杂交种产草量与品质性状的相关和回归分析,结果表明:前一茬株高与后一茬产草量呈显著负相关,刈割3次的产草量间呈显著正相关,且均与总产草量呈极显著正相关;粗蛋白质与粗纤维含量呈显著负相关,粗脂肪与粗灰分含量呈显著正相关;产草量高低与品质性状无显著相关关系。通径分析结果表明:第1茬分蘖及3次产草量与总产量的直接通径系数都为正值,其中第2次刈割的产草量的直接通径系数最大,为0.5334 。总产草量依各产草量性状的最优回归方程为:^y=-0.0522+0.0096x9+1.0006x13+1.0002x14+0.9989x15。

Regression analysis between forage yield and quality traits in seven strains of Sorghum-sudangrass hybrid were made.The results indicated that plant height at first clipping was significantly negatively correlated with second clipping yield,and the same was true for second clipping height with third clipping yield.There were significantly positive correlations among three times clipping yields.Each clipping yield was significantly positively correlated with total forage yield.Coarse protein was significantly negatively correlated with coarse fiber.Coarse fatty was significantly positively correlated with coarse ash.The results of path analysis indicated the direct path-coefficients of number of tillering and three times yields with total forage yield were significant,but the direct path-coefficient of second clipping yield was the highest.The regression equation was =-0.0522+0.0096X_9+1.0006X_(13)+1.0002X_(14)+0.9989X_(15)