At the early flower stage of the 2nd cut in 2 and 3 years age,the damage of thrips on 97 alfalfa varieties(strains) from inside/outside China was investigated.

In this study, twenty-two alfalfa varieties at home and abroad were used as the experiment material.

The relationship between different anti-aphis alfalfa varieties’the nutrients and anti-aphis machanismDuring 10 days’damaging , nourishing substance of the piercing damage Therioaphis trifolii on five alfalfa varieties (lines) changed as the following : the soluble sugar content of all the varieties

Preliminary report on the Medicago sativa varieties comparison trial in the Sanxia reservoir region;

Resistance mechanism of 10 Medicago sativa varieties were observed and analyzed.

The salt tolerances of 9 varieties of Alfalfa Cultivars in the stagesof seed germination and seedling have been studied by imitating the saltscomponents in the elbow area of the Yellow River, Inner Mongolia.

Study on the adaptability of eight Medicago sativa varieties in Fuzhou;

Advances in research on biology of alfalfa seeds;

Theadvancesinseed shape,nutritioncomponent,efects onthephysiologyand theralationshipofyieldandother characters of alfalfa seed are discussed.

The current research progress on alfalfa seed production in terms of yield components and the factors,such as climate,topography,planting density,irrigation,fertilization,pollination,plant growth,weeds and harvest time in China was discussed,and the problems existing in research work were analyzed as well.