How to prevent and treat summer vegetables and seedlings

The cause of leggy seedlings is mainly due to lack of light and high temperature, especially when the nighttime temperature is too high and the respiratory depletion is more likely to occur. In addition, nitrogen fertilizer and excessive water, sowing too dense, not timely transfer seedlings, etc., can easily lead to seedlings leggy. Appearance may occur during the summer vegetable nursery, but there are different reasons for leggy in each period: 1 The most likely cause of appetite, and cause a serious period of damage is the emergence of the cotyledon to the period of development, when the leggy is mainly due to sowing too dense After the emergence, they did not timely remove the cover, making the seedlings too crowded. 2 After the emergence of the seedlings, the temperature did not cool down in time, and the epicotyls of the seedlings were also prone to overgrowth. 3 The cotyledon was expanded to the 2- to 3-leaf stage, and the seedlings did not appear to have been planted or because of overheating and the planting of the seedlings was not timely. 4 After planting seedlings until after planting, due to continuous rain, the humidity of soil and air in seedbeds is too high, nitrogen fertilizer in nutrient soils is high, and the management of the seedlings that cannot be ventilated, light, or crowded in time can lead to leggy. The main methods for preventing seedlings from being leggy are: 1 The seeding density should not be too large so as to avoid seedling crowding after emergence. Such as solanaceous vegetables generally 667 square meters Daejee need to sow the bed 2--3 square meters, sowing 15-25g seeds. At the same time, ground cover was removed in time after about 30% emergence. 2 and time seedlings, planting and colonization. After emergence, eggplant should be treated with time seedlings, generally should be between 2 and 3 times; when the seedlings are “two leaves and one heart”, they should be planted. The density of the transplanted plants is controlled at 120-130 plants/m2. 3 strengthen ventilation and light, control of temperature and humidity. After exhumation of the seedlings and before planting, after transplanting the seedlings and after planting, the ventilation and transparence should be carried out, the temperature and humidity should be reduced, and the cold exercise should be strengthened to control the overgrowth of the seedlings. 4 Rationalize fertilizer and water management. In the preparation of nutritious soil, attention should be paid to the amount of phosphorus and potash fertilizer and the amount of nitrogen fertilizer should be controlled. Strict control of moisture and topdressing in the seedbed requires topdressing nitrogen fertilizer when dressing is required. 5 Timely sparse seedlings. About 20 days (days) before the planting of eggplant and melon, the overcrowding of the seedlings often occurs. At this time, the seedlings should be properly moved to separate the seedlings and the survival space of the individual plants. 6 drug control apprentice. In addition to the above-mentioned measures, once the seedlings are grown, they can be sprayed with a 0.2% Bordeaux mixture (equal volume) or sprayed with 50% Chlormequat 2000--2500.

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