At night, the ascent of SAP flow could be observed in the above main tree species owning to the existence of root pressure.
夜间，胡杨同样存在明显的树干液流现象，这主要是由根压引起的。
2
The influence of bleeding sap and Nitrate-nitrogen, Amino acid in rootsap of K4 which grown in the zone is researched in seed treatments and initial bloom stage after spraying on leaf with EDTA-Mn.
On the condition of dryland, bleeding SAP of different potato strains was determined to reflect the absorption vitality of root system, and the biological yield and tuber yield were also measured.