First, prevent seeds from falling. The seeds of Saussurea involucrata are conical, and it is easy to emerge when the seed tip is downward, but the seedlings are not strong, and it is not easy to emerge when the seed tip is upward. Therefore, it is best to lay the seeds flat when planting, which is beneficial to the robust growth of seedlings. Before sowing, the seeds were coated with a new high-fat film to drive away underground pests and diseases, isolate virus infection, strengthen respiratory intensity and improve seed germination rate.
Second, prevent the seedlings from being unearthed with caps. The emergence of capped seedlings directly affects the development of plants, leading to the seed coat and shell being brought out when cotyledons are unearthed. The reason is that the soil in the basin is too loose, too dry and too thin. The soil should be kept moist. Spraying new high-fat film after transplanting seedlings can effectively prevent water evaporation and seedling transpiration, isolate pests and diseases, shorten the slow seedling stage, quickly adapt to the new environment and grow healthily.
Third, rational fertilization. Nitrogen, phosphorus and potassium should be used reasonably according to the situation. Generally speaking, nitrogen fertilizer should be mainly applied in spring to promote the growth of branches and leaves; Phosphate fertilizer is mainly applied in summer to promote the expansion of stems, leaves and buds; In autumn, more potassium fertilizer was applied in the bud stage of flowers, which promoted the blooming of flowers and the fullness of seeds, and combined with spraying new high-fat film, the fertilizer efficiency was enhanced. The use of Hua Zhuang Di Ling in bud stage can promote strong buds, enlarged petals, bright colors, rich flowers and prolonged flowering period.
Fourth, prevent sudden fall and sudden fall diseases. Rhizoctonia solani in Saussurea involucrata mostly occurs at seedling stage, and the pathogen can spread and cause seedling death. Preventive measures: 1, the basin soil should be fully disinfected; 2, applying decomposed fertilizer; 3, the basin soil is not easy to get too wet; 4. Remove the diseased plants immediately when they are found, and spray fungicides, combined with spraying new high-fat film, to enhance the control effect. (