Abstract: Under the condition of applying exogenous selenium by root irrigation, the growth of Asparagus cochinchinensis （stem length, root number, root length, root diameter, root dry weight） and the change rule of active ingredient content in Asparagus cochinchinensis root were studied. The results showed that adding 10~40 mg/L exogenous selenium to soil during planting Asparagus cochinchinensis was beneficial to the growth of Asparagus cochinchinensis. When the concentration of exogenous selenium was 30 mg/L, the number of root tuber per plant of Asparagus cochinchinensis was the highest. When the concentration of selenium reached 50 mg/L, it had an inhibitory effect on the number of Asparagus cochinchinensis root tuber. When the concentration of exogenous selenium was 40 mg/L, the stem length, root length, root diameter and root dry weight of Asparagus cochinchinensis were the best. When the concentration of exogenous selenium was 10~50 mg/L, it could promote the accumulation of active ingredients. The overall optimal concentration of exogenous selenium for the accumulation of polysaccharides, saponins, and flavonoids in Asparagus cochinchinensis was 30 mg/L.

Key words: Asparagus cochinchinensis, exogenous selenium, active ingredient, content, growth