Growing eggplants in greenhouses can provide a supply of fresh eggplants all year round. If the management work before planting is the prerequisite for obtaining a high yield, then the management work after planting is the guarantee for obtaining a high yield. Since eggplants are planted in greenhouses with multiple stubbles, such as early spring stubble, late autumn stubble, autumn and winter stubble, winter and spring stubble, etc., the management focus after planting in each period is also different, but the temperature, humidity, water and fertilizer of eggplant in each growth period are The management work is basically the same. Next, I will take the winter and spring eggplant planting that has just been planted as an example to explain how to manage it after planting.

1. Management work in the early stage of planting

Winter and spring eggplants are basically not ventilated in the early stage of planting, and warming measures should be taken as much as possible. A polyester aluminum-coated film reflective curtain can be hung on the back wall of the greenhouse, which can increase the light intensity and temperature, and can also be used as a small shed. Keep the temperature in the greenhouse at around 30°C during the day and 15~20°C at night. When the temperature exceeds 32℃ at noon, the top window can be opened for ventilation for a short time. The opaque covering should be removed early and covered late, and the roof in front of the greenhouse should be kept clean at all times. If the temperature is lower than 15℃ at night, you can consider adding a canopy and covering it with multiple layers of paper and quilts. When the inner leaves of the seedlings turn green, it means that the seedlings have survived. After the seedlings are slowed down, the daytime temperature should be slightly lower. Keep it at 20℃~30℃ during the day on sunny days. The lowest temperature at night should still be kept above 13℃. At this time, the film-covered ones can be soiled once. To maintain moisture, the unmulched plants should be poured with water once to slow down the seedlings. After they are slightly dry, they should be shoveled deeply and shallowly to cultivate the soil.

2. Fertilizer and water management

The fertilizer and water management after planting is generally divided into two stages: the flowering and fruiting period and the fruiting period.

1. Flowering and fruiting period

Top dressing and watering should be carried out immediately when the tomato grows. Watering should be done in the morning on a sunny day. Water under the film, combined with watering, apply 10 kilograms of urea, 7.5 kilograms of potassium sulfate, and 5 kilograms of diammonium phosphate per acre. Mix and apply in holes. Fertilize first and water later. Carbon dioxide fertilization should be carried out after flowering and fruit setting. After watering, be sure to keep the greenhouse airtight for 1 to 2 hours. When you feel hot in the room, open the top ventilation window to let out air and moisture. If water from a storage pool is not used for watering, watering can be done in ditches to avoid lowering the ground temperature. Eggplants are cultivated in winter and spring when the outside temperature is relatively low. Therefore, you can peel off the mulch film to cultivate soil and support the ridges, appropriately heighten and widen the border surface, and cover the mulch again after cultivating the soil. This can not only promote the growth of the root system of the eggplant seedlings, but also Can be cultivated to preserve moisture. If it is not covered with mulch, you should carry out soil and moisture conservation work, which can effectively prevent excessive watering from affecting the ground temperature, causing leggy growth or flower and fruit drop.

2. Fruiting period

In order to promote the rapid expansion of fruits and increase yield, the supply of fertilizer and water should be further strengthened during the fruiting period. Water once in about 10 days, topdress once with fertilizer every other time, once with organic fertilizer such as decomposed manure or decomposed ring fertilizer or cake fertilizer, once with urea, organic fertilizer can be applied by removing the film, digging trenches, and then covering with mulch and fertilizing. After watering, chemical fertilizers can be applied with water. After watering, the greenhouse should be closed for 1 to 2 hours to increase the temperature to allow the moisture to rise. Then ventilate the top for a short time to drain away moisture. Watering must be carried out in the morning on a sunny day, and carbon dioxide gas fertilizer must be applied consistently.

3. Temperature management

1. During the flowering and fruiting period

There should be very little wind during the day. The temperature is maintained at 25℃~28℃ during the day, and the temperature above 25℃ is maintained for 5~6 hours. When the greenhouse temperature exceeds 30℃, the skylight is opened for ventilation and humidification. The temperature at night is maintained at 16℃~20℃, and the minimum cannot be lower than 12℃.

2. Fruiting period

After the eggplant has set fruit, it is still very cold outside and there is generally no ventilation during the day. The temperature should be maintained at 25℃~30℃ during the day and 15℃~20℃ at night. The temperature difference between day and night should be 10℃.

If you encounter disastrous weather, you should make full use of various feasible heating and insulation measures to try to keep the lowest indoor low temperature not lower than 8℃. When the indoor temperature drops to 5°C, artificial heating measures must be taken, otherwise freezing damage will occur.

4. Light management

Eggplant has relatively high requirements for light. When cultivated in winter and spring, the light conditions are difficult to meet the needs of normal growth of eggplant. Therefore, when conditions permit, the covering should be removed as early as possible and covered as late as possible. Even on cloudy days, uncover the grass thatch and take advantage of the sun's scattered light. When the weather is cold, the grass thatch should also be properly uncovered to expose it to light. If the weather suddenly turns sunny after continuous rain or snow, do not uncover all the grass thatch at once, but should do it in batches. Wipe off the dust on the surface of the shed film every day, and clean it at any time when snow falls.

Make the sunshine time of the greenhouse no less than 7 hours, and the light intensity reach 40,000 lux.

5. Plant adjustment

For dense planting of eggplants in the solar greenhouse, the methods of planting eggplants in the solar greenhouse can be: one eggplant with one fruit, double eggplant with two fruits, or four-door eggplant with three stems. 3 fruits, "Bamianfeng" 4 fruits pruned branches.

If the eggplants are densely planted, after the eggplants have set fruit, leave 2 to 3 true leaves of the eggplants on separate plants for topping. When the eggplants are harvested, use scissors to cut off one plant close to the ground. For long-distance planting, double-stem pruning can be used. No matter which pruning method is used, redundant side branches and buds must be removed in time, as well as old leaves, diseased leaves, and yellow leaves, to reduce excess consumption of the plant, which is more conducive to ventilation and light transmission, and promotes fruit development.

When the fruit sets of Solanum nigrum, hang the vines and tie the branches in time. Hanging vines and tying the branches are usually done in the afternoon on a sunny day. At this time, the plant branches consume a lot of water and the branches become softer. No matter how gentle you are when tying the vines, A few, and the branches will not be broken. If you want to carry out head-changing cultivation, after the four-door fruit set, leave 2 to 3 true leaves on the four-door fruit branches for topping, so that nutrients can be concentrated to supply the fruit and promote fruit enlargement. If you do not perform head-changing cultivation, leave 4 strong branches on the eight-sided air-drying position after the four-door fruit trees sit, and remove the remaining side branches and buds.

6. Harvesting

The fruits should be picked early and at the right time to increase the yield and increase the output value of eggplant.

The above is taking eggplants from winter and spring as an example to describe the management work of eggplants after planting. In fact, no matter which stubble is planting eggplants, the indoor temperature and humidity in the greenhouse must be well controlled during different growth periods. Management work such as lighting, water and fertilizer supply, etc., should make the environment as suitable as possible for the growth of eggplants. Only in this way can we ensure high yields of eggplants in greenhouses.