First, heartburn
It usually occurs when the plant grows to 11 to 12 leaves, and the heartburn is mainly caused by calcium deficiency. The celery cultivated in summer is prone to heartburn. When it is controlled, it should be started from management, so that the temperature and humidity are suitable. The appropriate amount of lime should be applied to the acidic soil. 0.5% calcium nitrate solution can be sprayed at the beginning of the disease.
Second, hollow
Hollows occur mostly on sandy soils and generally occur in the middle and late stages of plant growth. In addition, celery is also prone to hollowness when the soil is dry. Control methods: non-sand soil should be selected for planting, fertilized organic fertilizer should be applied before planting, and timely topdressing should be carried out. When the leaf color is shallow and the fertilizer is removed, 0.1% urea aqueous solution can be sprayed 2 to 3 times.
Third, petiole cracking
Causes of the disease: 1. Soil boron deficiency. 2. Under low temperature and drought conditions, plant growth is hindered. In addition, when the plant absorbs too much water, in case of high temperature and high humidity, the tissue will be quickly filled with water, causing the petiole to crack.
Control methods: 1. Apply sufficient decomposed organic fertilizer, apply 1 kg of borax per acre, and mix well with organic fertilizer; 2. Spray 0.1%-0.3% of borax solution on the foliar surface, and pay attention to watering during management.
It usually occurs when the plant grows to 11 to 12 leaves, and the heartburn is mainly caused by calcium deficiency. The celery cultivated in summer is prone to heartburn. When it is controlled, it should be started from management, so that the temperature and humidity are suitable. The appropriate amount of lime should be applied to the acidic soil. 0.5% calcium nitrate solution can be sprayed at the beginning of the disease.
Second, hollow
Hollows occur mostly on sandy soils and generally occur in the middle and late stages of plant growth. In addition, celery is also prone to hollowness when the soil is dry. Control methods: non-sand soil should be selected for planting, fertilized organic fertilizer should be applied before planting, and timely topdressing should be carried out. When the leaf color is shallow and the fertilizer is removed, 0.1% urea aqueous solution can be sprayed 2 to 3 times.
Third, petiole cracking
Causes of the disease: 1. Soil boron deficiency. 2. Under low temperature and drought conditions, plant growth is hindered. In addition, when the plant absorbs too much water, in case of high temperature and high humidity, the tissue will be quickly filled with water, causing the petiole to crack.
Control methods: 1. Apply sufficient decomposed organic fertilizer, apply 1 kg of borax per acre, and mix well with organic fertilizer; 2. Spray 0.1%-0.3% of borax solution on the foliar surface, and pay attention to watering during management.
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