Abstract: The present disclosure provides a preparation method for a seedling substrate using residues from Populus forests as raw materials and an application. The preparation method for a seedling substrate includes the following steps: crushing Populus fallen leaves into Populus fallen leaf scraps; crushing Populus dead branches into Populus dead branch scraps; mixing the Populus fallen leaf scraps, the Populus dead branch scraps, chicken manures and garden soil to obtain a mixture; adding effective microorganisms (EM) bacterial powder to the mixture for fermentation; and adding perlite during the fermentation to obtain a seedling substrate. The seedling substrate provided in the present disclosure is rich in microorganisms and comprehensive in nutrients, does not require additional fertilizers in a seedling stage, and is capable of promoting the growth of forest seedlings.

Abstract: The application provides a method for improving nutrient supply of female floral branches of Populus deltoides artificial hybridization. According to the technical links of the hybridization operation, the method separately integrates and improves the cultivation of female floral branch nutrient-supply seedlings (i.e., grafting rootstocks of floral branches), the pre-management of female floral branch nutrient-supply seedlings, the hydroponic management of floral branches, the Marching between female floral branches and rootstocks, the management of female floral branch nutrient-supply seedlings and the hydroponic management of female floral branches, so the goal of improving the seed-setting rate and quality of poplar hybrid seeds which came from the floral branches cultured in water has been achieved.

Abstract: The application provides a method for improving nutrient supply of female floral branches of Populus deltoides artificial hybridization. According to the technical links of the hybridization operation, the method separately integrates and improves the cultivation of female floral branch nutrient-supply seedlings (i.e., grafting rootstocks of floral branches), the pre-management of female floral branch nutrient-supply seedlings, the hydroponic management of floral branches, the Marching between female floral branches and rootstocks, the management of female floral branch nutrient-supply seedlings and the hydroponic management of female floral branches, so the goal of improving the seed-setting rate and quality of poplar hybrid seeds which came from the floral branches cultured in water has been achieved.