Causes and treatment methods for yellow apricot leaves on branches
As a star variety among succulent plants, pruned apricot with branches is favored by horticulture enthusiasts for its unique fleshy leaves and gorgeous colors. However, the yellow leaf phenomenon that often occurs during maintenance often confuses growers. This article will systematically analyze the four core causes of yellowing of leaves and provide highly operable response plans. In-depth analysis of the causes of yellow leaves of pruned apricot stems. Metabolic disorders caused by temperature imbalance. Native South African pruned stems are extremely sensitive to temperature, and 15 - 25 ℃ is its optimal growth range. When the environmental temperature is lower than 10 ℃, the permeability of cell membranes changes, and the structure of chloroplasts is damaged, resulting in the appearance of lutein. Special attention should be paid to the low temperature of window sills at night in winter. Actual measurements show that the night temperature of single-layer glass window sills is 3 - 5 ° C lower than that of indoors.
[Temperature control plan] It is recommended to use a plant fill light with temperature control function, which can not only maintain a 12-hour light cycle, but also provide basic heat source. In severe cold areas, a three-dimensional protection system of double-layer bridge-broken aluminum windows + thermal insulation cotton can be used. Chain reaction of improper water management This variety has typical water-storing characteristics of succulent plants, and its osmotic pressure of root hair cells is only 1/3 of that of ordinary plants. Excessive watering can cause root suffocation, which in turn can lead to Fusarium infection. The data shows that at 30 ° C, it only takes 72 hours for the basin soil to completely dry.
[Irrigation Strategy] It is recommended to use the "three-finger detection method": insert the index finger, middle finger and ring finger into the basin soil together, and water if the second finger does not feel moist. Combined with ceramsite paving layer can increase the water evaporation efficiency by 15%. The balance between light intensity and time length The branches of apricot trees require light intensity of 20,000 - 35,000 Lux, which is equivalent to natural light at 10 a.m. in spring/autumn. During indoor maintenance in winter, the light intensity of ordinary window sills often decays below 8000 Lux, resulting in inhibition of photosynthesis.
[Filling Light Solution] It is recommended to use full-spectrum plant lights to maintain a 12-hour light cycle per day. The distance between lights is controlled at 15 - 20 cm, and an illuminance meter is used to monitor to ensure that the light intensity meets the standard. Use 50% sunshade net for protection at noon in summer. Precise control of nutrient supply The demand ratio of nitrogen, phosphorus and potassium in this variety is 1:2:3, and the ratio of conventional meat-specific fertilizers is often not applicable. Old leaves turn yellow first when there is a lack of fertilizer, and new leaves appear burnt spots when there is a shortage of fertilizer. The EC value should be controlled between 0.8 and 1.2mS/cm.
[Fertilization Guidelines] Apply slow-release fertilizer every month during the spring and autumn growing seasons, and combine foliar spraying of potassium dihydrogen phosphate (concentration 0.1%) every two weeks. Soak the basin with clear water for 2 hours immediately when fertilizer damage occurs, and replace 50% of the substrate.
By systematically regulating the four elements of temperature, light, water and fertilizer, and regularly controlling pests and diseases, apricot branches and branches can not only restore their green state, but also demonstrate their unique ornamental value. Growers are advised to establish a maintenance log, record changes in key parameters, and gradually grasp the growth rhythm of the plant.