Reasons and prevention of the long-lost solanaceous vegetables in greenhouse

The reason why the tomato plants in greenhouses are long is that the soil is too wet, the relative humidity is about 80%, the nitrogen fertilizer is too much, or the continuous rainy weather, the air humidity is often higher than 50-60%, the light is insufficient, the planting is too dense, or the ventilation is poor. Cultivated peppers in the greenhouse, the first door pepper often can not sit, it is not caused by warm and high humidity. The temperature of autumn tomato is high, and there is more nitrogen fertilizer. It is not easy to colonize in time.

Main preventive measures:

1. Control the age of the seedlings and plant them in time. Strictly control the age of the seedlings. For example, the seedling age of the early mature tomato varieties is about 60 days, the mid-late ripe varieties are 70-80 days, and the autumn tomato seedlings are about 25 days old.

2, early planting preparation, promote seedlings slow seedlings. 10-30 days before planting, do a good job in soil preparation, application of base fertilizer, covering the roof film and skirt of the greenhouse, drainage and drainage around the greenhouse, so that when the seedlings are planted, the humidity in the shed is lower and the temperature is higher, which is beneficial to slowing down the seedlings.

3. Control the amount of nitrogen fertilizer, use deep sorghum cultivation to promote root growth.

4, timely and appropriate amount of pruning and leafing, scaffolding, so that ventilation and ventilation, and use growth regulators such as anti-falling spray, promote fruit set, inhibit excessive vegetative growth.

5. After planting the seedlings, spray the plants with an equal amount of Bordeaux mixture or 77% of the wettable powder 500-700 times every 15 days.

6. Ventilate in time. After the plants are slowed down, keep a certain amount of temperature, and boldly release the wind to reduce the humidity inside the shed. At the beginning of flowering and fruit setting, the bottom of the skirt should be placed at the bottom of the wind. When the lowest temperature at night is not lower than 15 °C, it should be ventilated day and night. In the hot summer season, the plastic can be removed in a desert, like an open field cultivation.

7, control fertilizer and water. The bottom of the fertilizer is sufficient, generally do not fertilize water before flowering and fruit setting, especially if it is covered with plastic film, after sitting on the fruit, it will start to apply fertilizer according to the situation.