Study on Cutting Propagation of Slash Pine×Caribbean Pine Hybrids

Trail on softwood cutting propagation of Slash pine×Caribbean pine F1 hybrids were couducted at Taishan Hongling Seed Orchard of Guangdong Province in winter of 1999. In the experiment, five treatments, two shady awning environments and four families were used. Over 95 percent average rooting rate of the hybrids was gained in proper cutting conditions in the experiment, and the growth of rootage and shoots of rooted cutting was very well. The results indicates that the affect of environments and genetic factors is significant on rooting rate, the sum of adventitious roots and the length of shoots of each rooted cutting. the ranges of above three sides are 2.2%, 1.39, 8.65 cm in two shady awning, but the small shady awning has a longer rooting time than the large one, and the ranges are 4.2%,1.41,41.75 cm,respectively in different families. It is effective to shorten the rooting time and raise height growth of the cuttings rooted, while the cuttings are dipped into 1 g·L-1 carbendazim water solution or 50 mg·L-1 No.1 ABT rooting powder+ 1 g·L-1 carbendazim water solution for 4 7 h. At the middle and south area of Guangdong Province, cuttings are all healed in 40 d after cutting,51 73 d?84 132 d after cutting are the period of higher rooting rate in the shady awning in winter or spring.