Study on Selecting the Excellent Strains of Alfalfa Hybrid Offspring

By measuring the indexes related to growth,yield,and quality of Gannong No. 3,Gannong No. 5,tourists alfalfa,and their hybrid offspring and combining gray systematic theory,we structured the comprehensive evaluation model for all materials. The results showed that fast-growing 12# and fast-growing 11# were better strains,and the growth height were respectively 105. 44 cm and 105. 42 cm,growth rates were 1. 75 cm and 1. 68 cm every day,meanwhile stem-leaf ratios were 0. 30 and 0. 25,branch numbers were 23 and 17,fresh yield were 39. 99 t/hm2and 35. 13 t/hm2,and then crude protein contents were 19. 95% and 23. 89%,relative feeding value were153. 15% and 157. 02%. The comprehensive evaluation result on average growth height,growth rate,leaf-stem ratio,branch number,fresh yield,crude protein content,and relative feeding value showed that multi-leaf 2#,fast-growing #5,fast-growing 20#,and fast-growing 21# could be used as good potential strains.