Breeding of Ginkgo biloba seedlings by smooth wood cutting in autumn

1. Sand culture treatment collect branches of the same year around August 20, take 20 cm long and 30 cm as cuttings, immediately remove leaves (leaving a little petiole), bundle 10 into bundles and put them into sand culture beds. The humidity of green sand in the sand culture bed is held by hand and dispersed as soon as it is loosened. After 10-15 days of sand culture, the basal tissue of the cuttings healed to produce rooting points, and the cuttings were cut when there was no rooting. Second, the nursery bed is prepared to build a seedbed in places with sufficient light, close to water sources, and better conditions for drainage and irrigation. The topsoil of the bed was mixed with half of the sand to remove weeds and insecticides were used to control underground pests. The seedbed is north-south, 6 meters long and 1.5 meters wide, and the bed surface is 20 centimeters above the ground. Third, after the seedling bed is set up, the cuttings cultivated in sand are cut according to the row spacing of 6 cm × 15 cm, and the cutting depth is 10 cm. After cutting, the cuttings are stamped, watered and covered with film. Fourth, to build a sunshade after cutting, the scaffolding should be 30cm higher than the film surface, and the canopy cover can be covered with corn straw, Reed wood, etc., and the covering thickness should be white sunlight in the bed. The following spring, the cuttage ginkgo seedlings can be uncovered after leaf development, but the awning should be retained until September.