Spring and summer are the vigorous period of plant growth. The plant grows rapidly in this period and has a large demand for nutrients. It is necessary to apply "three element" fertilizer mainly composed of nitrogen fertilizer; a small amount of phosphorus and potassium fertilizer can be applied in autumn to improve the ability of plants to survive the cold winter; a small amount of fertilizer can be applied to meet the growth demand when flowers enter the dormancy period in winter.
Strong plants grow fast, need more nutrients, and apply thin fertilizer frequently; sick plants grow slowly, need less fertilizer, can apply less fertilizer or not.
Plant in the bud stage to apply phosphorus and potassium fertilizer based on, can promote flower bud differentiation, make the plant more flowering; when the plant is flowering, it is not suitable to apply fertilizer, otherwise it will shorten the flowering period; plant fruit, but the fruit is not stable fertilization will lead to fruit, it is appropriate to apply phosphorus and potassium fertilizer in the fruit, especially in the fruit expansion period, to promote the growth of the fruit.
Alkaline fertilizer is forbidden for some plants, such as azalea and gardenia; the proportion of P-K fertilizer should be increased properly for the flowers that need to be cut again every year to promote the germination of new branches; N fertilizer is suitable for the flowers that mainly look at leaves; P-K fertilizer is suitable for the flowering period of fragrant flowers; and enough fertilizer should be applied for the flowers that look at fruits to improve the fruit yield.
