Latest Technical Key Points for Celery Greenhouse Cultivation and Management

Celery has a relatively long cultivation history. The plant itself is not very tall and grows relatively quickly, making it quite suitable for greenhouse planting and also very suitable for greenhouse insulated hydroponics. Greenhouse cultivation creates an artificial microclimate environment that can retain heat and moisture for off-season cultivation, but humidity control inside the greenhouse is difficult, and the air environment is not as good as outside. There are some drawbacks, and these drawbacks are also key points in greenhouse celery cultivation management.

I. Seedling Stage Management

No seed soaking is needed for sowing because the seeds are relatively small. Direct sowing is possible, but it is best to use seedling trays for raising seedlings, which reduces seedling-stage diseases and hidden pathogens. Seedling trays can save on seed usage, have a high germination rate, and are convenient to manage as they can be moved freely. They can be used directly for hydroponic seedling raising in the greenhouse. The nutrient soil should be sterilized. After roots develop, the seedling trays float on water for seedling raising. The greenhouse film light transmittance should not be too high, and light and temperature should not be too strong. Nutrient solution can be prepared directly for watering.

II. Transplanting Management

Transplant directly into the seedbed surface. For transplanting, gently lift the seedlings with nutrient soil attached, which basically does not damage the root system. After planting, keep moist until new leaves grow, then reduce watering. After the seedlings recover, as roots begin to grow, water multiple times but do not soak through, to guide roots to grow downward. After that comes the seedling hardening stage. During seedling hardening, apply less fertilizer and water. In the late seedling hardening stage, apply dilute fertilizer water.

III. Growth Management

1. Fertilization

After seedling hardening ends, the plant enters the rapid growth period, which requires a large supply of fertilizer and water. Celery is tolerant of fertilizer, mainly requiring nitrogen fertilizer, followed by phosphorus and potassium fertilizers. Nitrogen fertilizer mainly supports leaf growth. Phosphorus fertilizer has poor mobility, so it is mainly applied concentrated in the early stage. Celery stems need potassium fertilizer to remain upright and glossy, but not too much, as it easily causes hardening. It requires relatively more trace elements boron and calcium. Calcium deficiency causes hollow heart disease, and boron deficiency causes black heart disease, while potassium fertilizer inhibits calcium and boron absorption.

2. Temperature and Humidity

It can tolerate low temperatures and grow even at minus 10 degrees, but the optimal temperature is 15 to 20 degrees. At high temperatures, growth is slow or even stops. However, greenhouse film with higher opacity can be used to lower the temperature somewhat. The greenhouse temperature should be lowered at night. On sunny days, ventilate; 20 to 22 degrees is sufficient. Watering inside the greenhouse should be less frequent than in open fields. Do not flood irrigate; drip irrigation is best. Water vapor generated will condense and drip down, causing diseases, and humidity will also be too high. Only water when the soil looks dry.

Greenhouse celery cultivation aims to create an environment suitable for celery growth, but I think greenhouse cultivation is mainly most applicable in severely cold winter regions. Management differs due to the limitations imposed by the micro-environment. For more agricultural content, please continue to follow.