What preparations should be made before flower seeds are sown, and the essentials of fertilizing flowers in summer and autumn

(1) fertilizing in summer to prevent "fever". The temperature is higher in summer and the growth potential of most flowers is poor. Non-heat-resistant flowers such as a string of red, petunia, Fulang flower, gentleman orchid and so on grow very slowly when the summer temperature is high, and the requirement for fertilizer is not high, so fertilizer should be stopped at this time. Such as cooling: OK, flowers can be fertilized when they can grow normally.

Semi-dormant flowers in summer, such as rose and cyclamen, should stop fertilizing and start fertilizing after the temperature drops and resumes growth; for some high-temperature-resistant flowers such as zinnia, periwinkle, cockscomb, gladiolus, sunflower, summer is the peak season for their growth and flowering, and fertilizers should be used normally. However, due to the high daytime temperature in summer, fertilization should be chosen in the early morning or evening, and the concentration of fertilization should also be controlled to prevent root burning. After fertilization, you should immediately wash the leaves of flowers with clean water to prevent the liquid fertilizer splashing on the leaves from burning the leaves; water-raised flowers such as water lilies and bowl lotus can also be fertilized normally in summer, and rotten fertilizer can be embedded in the root soil, and there is no phenomenon of burning roots and leaves.

(2) the application of nitrogen fertilizer in autumn should be cautious. But for dormant flowers in winter, topdressing a large amount of nitrogen fertilizer in autumn will induce the occurrence of autumn shoots. The occurrence of autumn shoots will not only consume the nutrients stored in the flowers, but also affect the growth and flowering of flowers in the next spring. And because the dormancy time of flowers will be delayed after autumn shoots, and frost damage will occur when they encounter low temperature, so phosphorus and potassium fertilizer should be applied to winter dormant flowers in autumn. Phosphorus and potassium fertilizer can promote the accumulation of nutrients in flowers. Lay the foundation for the growth and flowering of the following year.

It is not that nitrogen fertilizer can not be applied in autumn. Flowers that are not dormant in winter can still apply nitrogen fertilizer, especially foliage plants should still apply nitrogen fertilizer. However, attention should be paid to the combination of nitrogen fertilizer and phosphorus and potassium fertilizer. Reasonable application of phosphorus and potassium fertilizer can improve the cold resistance of flowers. Plants that bloom in winter, such as Chrysanthemum morifolium, Prunus bungeanum, cyclamen, poinsettia and Lamei, are vegetative growth periods in early autumn, and fertilizers based on nitrogen fertilizer should be applied in early autumn. When fertilizing this kind of flowers, phosphorus and potassium fertilizer should be used as the main fertilizer. too much nitrogen fertilizer is not conducive to winter flowering.