Estimation And Studies On The Agronomic Traits And Drought Resistance Of A New Alfalfa Variety

The new alfalfa variety (Medicago varia Martin.cv.caoyuanNo3). is a hybrid which was selected from alfalfa caoyuan No.2 population by Inner Mongolia Agricultural University. The strain test,regional test and productive test was completed in three places, a numbers of foundation seed was reproducted. The biologic characreristics, agronomical performance, growth dynamic change, under-ground and above-ground biomass ,the content of nutrient material and drought resistance were studied. The results show that the new .variety has high yield and good quality because of the obvious hybrid vigor in the population. The rate of multicolored flowers in whole population is about 71.96%. The CP cousitents at tihe beginning of flowering is about 18.86% . The growing period continue about 120 days. The strain has exteremily drought and cold resistance. So it is suitable in the arid and semi-arid regions in northern areas of china. Forthmore, the appropriate agronomic measures were discussed.The new variety and the other five alfalfa varieties(strains) were compaired on their ability of drought resistance in seedling stage. The ratio of under ground biomass to above ground biomass, the ratio of relative growth of seedling, relative electrical conduction, content of free proline and POD activity were determined. The initial conclusion was given that the sequence of drought resistance ability of all these varieties(strains) is as follows: M saliva L.cv.Aohan > M varia Marrin.cv.CaoyuanNo3 > M varia Martin.cv.CaoyuanNo1 > M varia Martin.cv.CaoyuanNo2 > the Alfalfa strain from Germany > M saliva L.cv. Algonquin.