What happens if roses are fertilized too much
During rose cultivation, scientific fertilization is a key factor in determining plant health. Many flower lovers often fall into the misunderstanding that "the more fertilizer is applied, the more prosperous the flowers will bloom." However, they do not realize that excessive fertilization is like a chronic poison. Not only does it fail to promote growth, but it will also trigger a series of growth crises. This article will deeply analyze the dangers of excessive fertilization and reveal the fertilization tips of professional gardeners. 1. The triple crisis caused by excessive fertilization 1.1 Root burns and rot When the soil EC value exceeds 1.5mS/cm, the capillary roots of rose begin to experience dehydration. Excessive nitrogen fertilizer will lead to too high concentration of ammonium ions, directly destroying the osmotic balance of root cells. Typical symptoms are browning of new root tips and translucent rotten spots on old roots. 1.2 Physiological yellowing Excessive phosphate fertilizer will hinder the absorption of trace elements such as iron and zinc, causing the new leaves to appear net-like yellowing. Excess potassium fertilizer leads to calcium and magnesium antagonism, and the edges of old leaves appear scorched. This situation is particularly common in potted roses and is more likely to occur when the soil buffering capacity is weak. 1.3 Plant metabolism disorder. High-concentration fertilizers will change the osmotic pressure of soil solution and affect water absorption. Data show that when the soil salt content exceeds 0.3%, the photosynthetic efficiency of rose drops by 40%, and flower bud differentiation is blocked, manifested by an increase in blind branches and abnormal flower buds. 2. The golden rule of scientific fertilization 2.1 Technical points of the burial method. Professional cultivation recommends the circular ditch application method: with the main trunk as the center, excavate a 5cm deep circular ditch at a radius of 15cm. Mixing decomposed organic fertilizer with soil in a ratio of 1:3 can ensure slow release of fertilizer (G-Y). Ground planted roses are ditched twice a year, and potted plants are recommended in conjunction with pot change. 2.2 Suitable scenarios for spreading quick-acting water-soluble fertilizers can be spread on the surface, but the "secondary dilution method" needs to be used: first dissolve the fertilizer with 500ml of water, and then mix it to the required concentration. Application needs to be reduced by 30% before rain to avoid nutrient loss. During the winter dormant period, plant ash can be spread on the surface to supplement potassium and adjust pH. 2.3 Precision fertilization timetable Germination period (above 15℃): application of high-nitrogen water-soluble fertilizer (N-P-K=30-10-10) budding period: switch high-phosphorus and potassium formula (10-30-20) pruning after flowering: supplement balanced fertilizer (20-20-20) Before overwinter: add decomposed bone meal (containing 38% phosphorus) 3. First aid and daily prevention of fertilizer damage When the leaf edges are found to be scorched, immediately rinse with clear water for 3 times continuously, potted plants can soak the pot body for 30 minutes. For serious fertilizer damage, soil needs to be changed and roots repaired. Disinfect with 800 times carbendazim solution and re-plant. It is recommended to equip an EC meter for daily maintenance to control the conductivity of cultured soil within a safe range of 0.8-1.2mS/cm.
By mastering the principle of "applying fertilizer thinly and frequently and adapting to the times" and cooperating with correct fertilization techniques, fertilizer damage can be avoided and the maximum flowering potential of roses can be stimulated. Remember that healthy plants are always more important than short-term blooms. Only by scientific maintenance can we harvest sustainable and amazing blooms.