Detailed Explanation of Key Techniques for Off-Season Greenhouse Vegetable Cultivation

SummarySite selection and greenhouse construction: The plot for building the greenhouse should be sheltered from the wind, have sufficient sunlight, convenient drainage and irrigation, and flat terrain. After construction is completed, sterilization and disinfection can be carried out by chemical disinfection or high-temperature greenhouse sealing. Soil preparation and fertilization: After deep plowing the soil, apply sufficient base fertilizer, or use a prepared nutrient soil. Selecting vegetable varieties: Choose early-maturing varieties with cold tolerance and strong disease resistance, such as cucumber, pepper, etc. Later management: After planting, water thoroughly, fertilize and weed regularly, and do a good job of cold protection and warmth preservation in advance.

I. Site Selection and Greenhouse Construction

1. Off-season greenhouse vegetables should be planted in a place that is sheltered from the wind, convenient for drainage and irrigation, has sufficient sunlight, and has relatively flat terrain, with plains or hilly areas being the first choice.

2. Greenhouses are mainly divided into two types, spring-autumn greenhouses and winter-warm greenhouses. For early spring and late autumn planting, spring-autumn greenhouses can be used, while for winter planting, winter-warm greenhouses should be used.

3. After the greenhouse is built, sterilization and disinfection can be carried out by chemical disinfection or high-temperature greenhouse sealing, which can effectively prevent and control pests and diseases. About 15 days before planting, multiple white powder can be sprayed inside the greenhouse, then sealed, and chlorothalonil smoke agent can be fully used for fumigation for about one week. In order to improve the sterilization and disinfection effect, carbendazim can be sprayed on the ground.

II. Soil Preparation and Fertilization

1. In order to allow vegetables to grow better, the nutrient soil needs to be prepared well before planting. Fertile soil should be selected, and fertilizer should be applied together with soil preparation.

2. Generally, fertilizer is applied about 30 days before planting. Spread an appropriate amount of decomposed fertilizer on the soil, then plow it so that it mixes evenly with the soil. Note that if unfermented fertilizer is applied, fermentation in the soil will produce toxic gases and affect vegetable growth.

III. Selecting Vegetable Varieties

When planting off-season vegetables, in order to increase yield, early-maturing varieties with good disease resistance and cold tolerance should be selected, such as cucumber, eggplant, tomato, pepper, loofah, zucchini, and other vegetables. In winter, vegetables such as spinach and Chinese cabbage can also be planted.

IV. Field Management

1. Vegetables can be planted by the hole planting method. In order to improve the survival rate, organic fertilizer can be applied in the planting holes. After planting, water thoroughly to keep the soil moist. Different vegetable varieties have different water requirements. In order to meet the growth needs of different vegetables, the number of waterings should be reasonably controlled.

2. Later, in order to promote vegetable growth, weeds should be removed at the time of planting, combined with loosening the soil, which helps promote the root growth of seedlings.

3. Later, pest and disease prevention and control work also needs to be strengthened. Diseased and weak plants should be removed in time to prevent the spread of pests and diseases, and growth inhibitors and growth hormones should be sprayed reasonably.

V. Cold Protection and Warmth Preservation

1. Cold protection and warmth preservation work should be done in advance for off-season vegetables. If seedling roots lack nutrients, have poor cold resistance, lack water, have low ground temperature, and face low nighttime temperatures, this situation can easily lead to freezing damage.

2. Preventive measures: Keep the soil at a certain humidity level. In order to prevent soil compaction, loosen the soil regularly. In order to meet plant nutrition needs, spray foliar fertilizer after planting. Maintain ventilation so that vegetables can adapt to outside temperatures as early as possible. In order to increase the temperature inside the greenhouse, multiple layers of plastic wrap can be covered at night.