Nurse Seed Grafting Methods of Juglans regia

In order to enhance the survival rate of nurse seed grafting of walnut splitting grafting,improved square bud grafting,and bud with xylem grafting methods were adopted.Young seedling stocks were obtained by seeding the walnut seeds that were stratified for 3 months under 5℃±1℃ in the medium(perlite,decay organic materials,and sawdust =1∶1∶1) under natural condition in March 27,2007.Graftings were conducted on May 22.The assessment index was survival rate and growth increment.The results showed that survival rate and growth increment of splitting grafting on July 15 were higher than those other two methods,which reached 95.00% and 48.78 cm,improved square bud grafting took the second place, which reached 86.67% and 38.59 cm,which was not significantly different from spliting grafting,the survival rate of bud with xylem grafting was low,reached 63.33%,which was different from other methods,growth increment reached 35.93 cm,which was not significantly different with improved square bud grafting and was different from splitting grafting.Because the bud location on budwood of three grafting methods was different,the three methods all can be used in production.The study makes it feasible for grafting in one year after seeding of walnut.