Dig the grave and dig the burnt soil, okay?

Digging graves and burning earth is a good thing. Burning soil is a common substrate material for seedling raising in China, which is widely used in the south. It is worth noting that burning soil cannot be used alone for seedling raising, otherwise it will burn seedlings. Burning soil must be used in combination with other matrix materials, and the best effect is to use burning soil as seedling material, 70% burning soil and 30% yellow soil as covering soil. Using a proper amount of burnt soil as territory, the germination rate and seedling rate of seeds are significantly improved, which can promote the growth and development of roots and aboveground parts of seedlings, improve strong seedling strings, ensure the robustness of seeds and seedlings, and improve the quality of artificial afforestation. The most significant effect of raising seedlings by burning soil is the root growth of seedlings. The growth rate of taproot length, lateral root number and fibrous root number is between 33% and 52%, and the root system is developed, which improves the effective nutrition space of the underground part of seedlings, makes them fully absorb soil fertilizer, promotes the vigorous growth of seedlings and ensures the quality of seedlings.