First, cover the film. When spinach is sown, the solar greenhouse has not yet covered the film. Under open conditions, the climate is suitable for spinach sprouting and seedling growth. Covering the membrane during the colonization period is very important. The suitable temperature for spinach plant growth is 15-20°C, and the optimum temperature for the growth of the foliage is 17-20°C. Therefore, the film should be covered when the daytime temperature is lower than 15°C.
Second, control the temperature. After the film is covered, high temperatures must be prevented because of poor growth above 25°C. According to the experiment, during the vegetative growth of spinach, the speed of the seedling terminal primordium is below the daily average temperature of 23°C, and it decreases slowly with the temperature, and it has no obvious relationship with the length of the sun. If it exceeds 25°C, the temperature will limit the expansion of the leaf area. . Therefore, the film should be ventilated after being covered with the film. It should be controlled at 20°C to 23°C during the day and 10°C at night. With the decrease of external temperature, ventilation time is gradually shortened and ventilation is reduced. Cover grasshoppers when the night temperature falls below 10°C. In the early stages, the late cover was released early. When the temperature dropped to 10 to 12°C, the grass was lowered and the sun rolled up in the morning.
Third, suitable for watering. In order to improve the quality of the product, when the two true leaves are spread, the seedlings are to be carried out so that the distance between the plants is uniform and the plant size is uniform. Spinach has a well-developed root system, strong water-absorption capacity, and does not require watering. Water is poured 1 to 3 days before the film is covered, and water is generally not applied after the film is covered. When the leafy vegetation grows vigorously, chase 1 nitrogen fertilizer, and apply 10 kg of urea per acre. After vanishing on the leaf near the noon, sprinkle it on the surface of the noodles with fresh water and water. Pour 1 additional water 2 to 3 days before harvest.
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