Research On Intelligent Cultivation Of Integrated Water And Fertilizer For Robinia Pseudoacacia

Robinia pseudoacacia was an excellent landscaping tree species,which grows rapidly and has strong adaptability.However,due to the backward cultivation and management patterns,the quality of the R.pseudoacacia seedlings were uneven.Therefore,the research on cultivation and management patterns for nurseries can effectively promote the quality of seedlings.In this study,2,3-year-old R.pseudoacacia nursery was studied and an intelligent drip irrigation and fertilizer integrated test area was established at the Chengdong Farm Base in Guoyang,Bozhou.The objectives of this study were to analyze the wetting front and the soil moisture dynamics of the soil profile under drip irrigation,the growth of trees under different irrigation and fertilization treatment,to establish the irrigation and fertilization schedule of R.pseudoacacia nursery.（1）Exploring the pattern of soil moisture movement in the R.pseudoacacia nursery under drip irrigation,it was found that when the distance between the drip heads was 50cm,the drip irrigation pipe with the flow rate of 2L·h^-1 continued to drip irrigation for 7 hours,the wet zone can be formed along the tree row within the range of 30-90cm,and the drip irrigation pipe with the flow rate of 4L·h^-1 continued to drip irrigation for 3.5 hours,the wet zone can be formed along the tree row within the range of 0-90cm.It can provide important parameters for the design of drip irrigation system.（2）Through the study of R.pseudoacacia seedlings found that different growth indicators of different irrigation treatments on R.pseudoacacia seedlings have significant effect.Irrigation starts when the relative soil moisture content reaches to 70%which could increase fine root growth and improve the quality of seedlings.Based on the drip irrigation model mentioned above,the annual drip irrigation program was made for 3-year-old R.pseudoacacia seedlings,i.e.11 times of irrigation by totally irrigation quantity of 792 m³·hm^-2should be given with one time irrigation duration was 7 hours,with one time irrigation capacity of 1250 plants per hectare was 72m³·hm^-2 during May and October.（3）The fertilization scheme of 3-year-old R.pseudoacacia seedlings under drip irrigation was proposed.Based on the absorption of nitrogen,phosphorus and potassium nutrients during the growing season,fertigation was carried out.The annual fertilization amount per tree was 147g N+29g P₂O₅+62g K₂O,10 times finished.