1, nutritional deficiency. Lemon needs a steady supply of nutrients when it grows, and leaves will turn yellow if there is insufficient nutrients. Don't add nutrients until the leaves turn yellow. The process of adding nutrients is a little slower, so it is more acceptable. If the symptoms have not been alleviated after nutritional supplement, it is necessary to consider whether it is iron deficiency or yellow flower loss. In this case, spraying Woye foliar fertilizer is enough.
2. Root rot is mostly caused by too much watering or too thick fertilization, which will directly affect its ability to absorb nutrients, and it is not surprising that leaves turn yellow. First of all, clean up the rotten roots, then apply diluent to the incision, and then cover the soil after the incision is scarred. After covering the soil, water as little as possible to avoid re-infection.
Maintenance of lemon trees
Before and after flowering, lemon trees should be topdressing many times, applying multi-element flower fertilizer once a month and spraying flower nutrient solution once half a month to ensure that the fruits are not easy to fall off and have bright colors. Lemon is a light-loving plant. However, if the sun is too strong, it will grow badly. Plants usually need to be replaced at noon. The annual average temperature suitable for growth is above 65438 05℃, and the optimum growth temperature is 23℃~ 29℃. If the temperature exceeds 35℃, plants will stop growing, and if it is -2℃, they will freeze to death.
Lemon needs more water in its growth and development, but too much water is not easy to rot its roots. Generally speaking, spring is the time when the buds germinate and the leaves unfold. The pregnant buds are in full bloom and should be watered properly. The time is before winter. At this time, it is necessary to cut off its old branches and weak branches, and then cut off too dense flower branches to ensure its safety in winter.