Under the arid conditions

transpiration of plants can cause substantial loss of water.Semi-arid loess areas are the key areas for the returning farmland to forest and eco-forestry projects.In these areas

however

potential evapotranspiration is stronger and precipitation is less than other areas.Artificial afforestation is confronted with great difficulties.Spraying the new anti2transpiration foliar fertilizer may provide the necessary nutrients

inhibit transpiration

improve plant water potential

and to some extent

improve the viability of plants.The study uses Rhus ty phina

Robinia pseudoacacia

and Ulmus pumila to investigate the effects of the three foliar fertilizers.It is found that the best formulation is self2made A or self-made B +Ulmus pumila + 300～1 200 times diluted + 10 %～25 % soil moisture.