Substrate for floating seedling cultivation of fire-cured tobacco and preparation method thereof

The invention belongs to the technical field of tobacco cultivation, particularly to cured tobacco float seedling and preparation method. Each component of the cured tobacco float seedling comprises according to the following quality ratio: rotten straw 65-70%, vermiculite 15-20%, puffing perlite 10-20%. According to the invention, tobacco leaf seedling cost is reduced, resources are utilized reasonably, prepared ground substance is suitable for normal development of tobacco seedlings, during development of the tobacco leaf, seedling ratio and seedling generation of the tobacco belong to the normal. The prepared ground substance is loose, gas permeability is good, supply of nourishment and water meet with the development of the tobacco seedling, therefore the root system of the tobacco seedling is developed, quantity of the lateral root reaches more than 300.