Greenhouse celery is popular among vegetable growers because of its easy management and high yield. Winter greenhouse celery management should pay attention to the following points:
1. Seedling stage: celery seeds are small and the top soil is small. In order to ensure the celery germination rate, mixing about 10% bio-organic fertilizer in the nutrient soil of the seedbed can improve the physical and chemical properties and biological characteristics of the nutrient soil, reduce the infection of pathogens, and promote the germination and emergence of celery. When the celery tops the soil, lightly pour water once, and the seedlings can be harvested in 1-2 days. After that, keep the soil moist and use less watering as the principle. When the height of the seedlings is 5-6cm, apply humic acid water-soluble fertilizer once with water, 1 to 2kg per acre, and when the seedlings reach 10cm in height, apply fertilizer once more, and use 2 to 3kg per acre. 800 times solution of acid foliar fertilizer, strengthen plant nutrition, promote seedling growth and prevent the emergence of diseased and weak seedlings.
2. Planting and slow seedling period After the planting to the slow seedling period, water and lightly water to keep the soil moist. When new leaves grow and new roots appear, appropriate tilling and root cutting will promote the proliferation of new roots, the root system will stab, and the heart leaf differentiation will accelerate. In the late stage of squatting, combined with watering, humic acid fertilizer is applied with water to accelerate new roots.
3. Vegetative growth period
The vegetative growth period of celery is the key period for yield formation. After squatting seedlings, we must concentrate fertilizer and water to promote vegetative growth of the plant. Celery has a weak absorption capacity, but its fertility is strong. Generally, the amount of fertilizer applied is much more than 2 to 3 times its absorption capacity, and its root system can absorb a large amount of fertilizer only under high soil concentration. The edible organ of celery is the vegetative body, and its fertilizer requirement gradually increases with the increase of its growth period. The middle and late stage management is the last step to win the high yield and high quality of celery. In the management, attention should be paid to the management of temperature and fertilizer and water. (1) Temperature. Celery is a low-temperature-resistant vegetable with a minimum temperature of -7 to -10 ° C, but its suitable growth temperature is 15-20 ° C. Therefore, we should master the principle of lower temperature and not higher in temperature management. As far as the current shed is concerned, a moderately high temperature during the day can promote assimilation, which is beneficial to the increase of leaves and petiole elongation, and a moderately low at night, which is conducive to the increase of leaf weight and petiole hypertrophy. Blow out when the temperature rises to 22 ~ 25 ℃, and close the air outlet when the temperature drops to 20 ~ 22 ℃. Do not let out the wind in bad weather such as cloudy days, or let the air out for 30 minutes at noon to exhaust moisture when the humidity in the shed is too high. (2) Fertilizer and water, celery belongs to shallow root and solid leafy vegetables. Therefore, nitrogenous fertilizer is the main growth phase, supplemented by phosphorus and potassium. Phosphate fertilizer has poor mobility in the soil, so it is better to apply phosphate fertilizer at the end of the earlier period, and do not apply it later. Potassium fertilizer can promote the stout and fullness of petioles, which has a great impact on yield increase. It can also make celery have a good gloss and reduce fiber, thereby improving the quality of celery. It is very important to apply potassium fertilizer reasonably. At this stage, potassium nitrate is used as an example. It is advisable to use 4 ~ 5kg per 667m2. Special care should not be taken too much, because excessive potassium can inhibit the absorption of boron and calcium, and calcium deficiency can easily cause dry heart disease. Black heart disease, heart rot, etc.
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