Heart rot of celery is a physiological disease. The main symptom is the dark green leaves of celery, and the heart is yellow and rotten. Causes of the disease: 1. The lack of calcium in the soil; 2. The lack of boron in the soil, resulting in difficulties in the absorption of calcium celery root; 3. The concentration of salt in the soil is too large, causing calcium absorption difficulties; 4. In the dry condition The excessive amount of nitrogen fertilizer causes the difficulty of boron absorption in roots, resulting in insufficient calcium absorption. Control methods: adjust the content of nitrogen, phosphorus, potassium, boron, calcium and other elements in the soil. Soil testing formula fertilization. Onset of spraying 0.3% -0.5% calcium nitrate solution.
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