Technique of Pregermination, Grafting and Rotation in nursery for Seedling Cultivation of Carya illinoensis

In February and March 2014, soaking with GA3 and water and followed by stratification of introduced Carya illinoensis seed for root stock were implemented in Lishui, Zhejiang province, taking no soaking as control. They were sowed in nurseries with previous Pinus massoniana, rice and P. elliottii seedling followed by one year fallow. Grafting test was carried out in March, August and September 2011 with scion of C. illinoensis ‘Mahan’. The result showed that it could promote germination and percentage and uniformity seed treated by soaking with 0.4 g/L of GA3 solution and water for 120 hours. Seeds soaked with 0.4 g/L of GA3 germinated 10 days earlier than that with water and 30 days than that of control. It had significant differences in 1-year height, ground diameter and the grafting ratio of 1-year seedlings between previous pine seedlings and rice. Bud grafting in autumn had 90% of survival rate. Grafting in spring (last ten-day of March) had survival rate by bud grafting > cut grafting > cleft grafting. Seedlings grafted in autumn would cut rootstock the next spring 2 cm up the connector.