1, more soil is alkalized by water irrigation. If there is too much water, the soil may be a little hard and airtight. Water less and loosen the soil. If it is in the north, the soil may be alkaline, you can add some ferrous sulfate to increase the acidity (please ask the florist for the specific ratio of water to water). In addition, we should pay attention to changing soil. When watering, be careful not to accumulate water. When the soil in the basin is dry, water should be sprayed on the leaves and trunk to stimulate their growth.
2. Root rot causes leaves to fall off. Root rot is often caused by too much water in the basin or too thick fertilization. Remember to clean the bud, cut off the rotten roots, and then pay attention to drainage. There are too many rotten parts, and plants may not be saved.
3, the harm of red spider (mite), careful observation should be able to find very small bugs. Soak tobacco or leftover cigarette butts in water for more than half a day and spray with filtrate.
Extended data:
Small lemon tree with few or no thorns, dark purple leaves with buds, thick paper leaves, oval or oval. Flowers axillary or rarely clustered. The fruit is oval or ovoid, with thick peel, usually rough, lemon yellow, sour to very sour juice, small seeds, ovoid and sharp; Seed coat is smooth, cotyledons are milky white, usually single embryo or multi-embryo. The flowering period is April-May, and the fruiting period is September-165438+1October.
Lemon is suitable for planting on warm gentle slope, with deep soil layer and good drainage. The most suitable soil pH value of lemon is between 5.5 and 7.0.
Lemon is warm, shade-tolerant, cold-resistant and heat-resistant, and is suitable for cultivation in subtropical areas with warm winter and cool summer. The suitable annual average temperature of lemon is 17- 19℃, the annual effective accumulated temperature (≥ 10℃) is above 5500℃, the monthly average temperature of 1 is 6-8℃, and the extreme minimum temperature is above -3℃. The annual rainfall exceeds 1000 mm and the annual sunshine hours exceed 1000 hours.
References:
Baidu encyclopedia-lemon