The main symptom of the "rotten heart" phenomenon of celery is the deep green leaves of the celery, yellow and rotted heart. This phenomenon can occur in the whole growth period of celery, especially in the seedling stage. The light causes the celery to lack seedlings to reduce production, even severely destroy the seed.

First, the cause of the disease:

1. Physiological diseases caused by calcium deficiency. Due to high temperature, drought, improper fertilization, or high temperature in the greenhouse, the lack of water impedes the absorption of calcium by the roots, resulting in rotten heart; or excessive nitrogen, potassium, and magnesium in the soil, hindering the absorption of calcium by plants due to antagonism.

2. Boron deficiency. The effective boron content in the soil is low or the plants cannot absorb boron properly due to antagonism.

3. Bacterial soft rot. The disease mainly occurs on the base or stem of the petiole, and the symptoms are water-soaked, light-brown spindle-shaped or irregular-shaped depression spots, followed by wet rot and black stinky.

4. Sclerotinia. Sclerotinia mainly infects the base and root parts of the petiole near the ground of the celery, causing the affected parts to be rotted and rot. When the humidity is high, the white hyphae are observed, and the rat worm-like black sclerotia are formed.

Second, prevention and control measures:

1. The cultivation of strong seedlings is an important measure. When seedlings need time and seedlings, the petioles are stout and the root system is developed. Reasonably watering to prevent the humidity in the earthworms is too large. Seedlings of 3-4 leaves need to be dry and wet to promote root development. After planting and watering, watering should not be too much later.

2. To pay attention to balanced fertilization, while controlling the environmental temperature and soil moisture, to prevent physiological calcium deficiency in celery, vegetable farmers can spray 0.3% calcium nitrate solution mixed with 0.2% borax solution for prevention. At the same time, vegetable farmers should reduce the use of nitrogen fertilizers, especially ammonium nitrogen, and appropriately increase the amount of potash fertilizer to facilitate the absorption and utilization of calcium.

3. Chemical control.

(1) Bacterial soft rot: The vegetable farmer can use 72% of agricultural streptomycin or neomycin-enhanced 3000-4000 times of liquid, 14% of complex ammonia copper water agent 300 times, and 77% can kill 500 times. Liquid or 47% Garnett 600 times for control.

(2) Sclerotinia: You can use 50% of Nongliling 1500 times, 50% Sulfatide 1000 times, 50% Doxemol 800 times, 40% Sclerotate 800 times, 50% isoprenil 1000 times liquid or 20% cecrocin 750 times spray control.

Greenhouse Hydroponic System

Hydroponics is a subset of hydroculture, the method of growing plants without soil, using mineral nutrient solutions in a water solvent. Terrestrial plants may be grown with only their roots exposed to the mineral solution, or the roots may be supported by an inert medium, such as perlite or gravel. The nutrients in hydroponics can come from an array of different sources; these can include but are not limited to waste from fish waste, duck manure, or normal nutrients.

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