How to do well the management of greenhouse vegetables at the beginning of summer

With the fall of summer, the greenhouse vegetables in winter and spring have entered the late growth stage, and the vegetables in summer can also be planted. How to take corresponding vegetable management measures according to the change of temperature? The editor thinks that we should grasp it from the following four aspects:

Greenhouse vegetables

First, adjust the greenhouse film and control the temperature reasonably. When the minimum temperature is stable above 15 ℃, the grass curtain of the winter greenhouse should be removed in time or no longer covered at night, so as to avoid excessive night temperature, vegetables consuming a lot of nutrition and poor flowering and fruit setting. As the temperature increases, the top ventilation time and ventilation volume are increased. When the headwind is difficult to control, open the vents in front of the greenhouse, and take appropriate measures to shade and cool down to ensure the normal growth of vegetables in the greenhouse.

For the arch shed, these three ways can be used to regulate the greenhouse environment: first, the top film does not move, take away the skirt. The upper part is covered with film to protect the rain, and the lower part is ventilated and wet. Second, the top membrane does not move, take away the skirt and cover the insect-proof net. The top film can cover the rain, which can isolate the pests that harm the vegetables in the greenhouse, but the ventilation and moisture permeability is poor. The third is to remove the skirt, retain the top membrane, and cover the sunshade net. This method is suitable for the production and seedling raising of summer vegetables.

Second, strengthen fertilizer and water to improve the later benefit of greenhouse vegetables in winter and spring. After the Beginning of Summer, the vegetables in winter and spring in the greenhouse in the later stage of growth will inevitably appear vegetable plant aging. At this time, we can start from the two aspects of leaf cultivation and root protection, spray fully nutritious foliar fertilizer every 7-10 days, such as fragrant run (20:20:20), to meet the nutritional needs of vegetable growth in time. High nitrogen chemical fertilizer can not be used alone, but Fangrun (20:10:30) can be used, or potassium sulfate compound fertilizer combined with compound microbial fertilizer can be used to strengthen root and promote fruit and increase vegetable yield.

Third, summer vegetables, promote roots, control seedlings, cultivate strong trees. If the temperature is high, the plant is easy to grow. In addition to regulating the greenhouse environment, the soil and watering should be well controlled to cultivate strong vegetable roots. During planting, the application of 80-120 kg biological fertilizer for rooting and anti-death trees can not only inhibit the occurrence of root diseases, but also promote rooting, inhibit growth and growth, which is beneficial to the cultivation of strong vegetables. After planting slow seedlings, control watering, and timely ploughing and hoeing, loosen the soil, enhance the soil permeability and promote the development of root system. After the overgrowth of vegetable plants occurs, inhibitors such as 750x or 1500 times can be used in time to regulate.

Fourth, strictly guard against diseases and insect pests. As a late-growing vegetable in winter and spring, there is no control of diseases and insect pests. It will not only reduce the yield and quality of vegetables, but also increase the number of pathogens in the greenhouse, which is not conducive to the planting of the next crop. For example, tomato leaf mildew can be sprayed with Jiarinong or Shigao, and should be sprayed through strictly; and for example, copper preparation or streptomycin can be used to spray to control bacterial diseases. Acetamiprid mixed with chlorpromazine can be used to spray or irrigate root pests such as aphids and whitefly; for example, Ningnanmycin or virus A can be used to control virus diseases with zinc-containing foliar fertilizer.