1. Part of the reason that root maintenance leads to premature aging of cucumber is because of the aging of cucumber roots. Therefore, in order to prevent the premature aging of cucumber, root maintenance must be done well. The low temperature in the shed should not exceed 25°C to promote the growth of roots. Pay attention to the time when watering. The most important thing is to water before 10 o'clock. Do not water in the afternoon to avoid high ground temperature and low water temperature, which may cause the roots to be unable to adapt, which may cause damage. If the soil is hardened, remove the mulch in time and carry out medium tillage and shallow hoeing to increase the permeability of the soil and promote the normal growth of cucumbers.
2. Fertilizer and water management In the later stage of cucumber growth, water and fertilizer should be properly done according to the growth of the plants. When top dressing is combined with watering once, apply a high-nitrogen-potassium compound fertilizer, but pay attention to controlling the amount to prevent excessive fertilizer from causing root burning in cucumber plants. Topdressing is usually done once every 2 to 3 weeks to provide sufficient nutrients for the growth of plants and fruits. For cucumber roots that have begun to senescence in the late growth period, appropriate topdressing of foliar fertilizers, such as potassium dihydrogen phosphate, humic acid foliar fertilizer, etc., should be applied approximately once a week to supplement the plants with nutrients that are lacking due to insufficient root capacity. Slow down the senescence process of plants.
Third, prevent high temperature heat damage After the cucumber greenhouse temperature exceeds 30 ℃, it is necessary to do a good job of preventing wind and cooling. Especially in the afternoon, when the temperature is high, increase the vent. Then, watering and cooling should be done according to the actual conditions such as weather changes and soil moisture content. The main purpose is to irrigate with small water frequently to avoid heat damage that will hinder the growth of cucumber stems and leaves, which will lead to premature aging. If the cooling methods such as ventilation and irrigation are not ideal, the sunshade net should be covered in time to effectively reduce the temperature. But it should be noted that the shading net can only be covered under high temperature and strong light. When the natural light is weakened or the natural light is insufficient in rainy days, the shading net should be opened in time.
Fourth, strengthen management. During the cucumber growth period, the height of the plant should be controlled. If the cucumber stems are close to the roof, the vines should be dropped in time. Also pay attention to the height when falling vines. Too low is very detrimental to the growth of cucumbers. The height of the plants after falling vines should be kept at about 1.5 meters, and the plants should retain at least 20 functional leaves. The leaves should be evenly distributed on the plant to improve photosynthetic efficiency. Then remove the diseased and pest leaves and melons in time, such as dead leaves, yellow leaves, pests and diseases, and deformed melons. Avoid consuming too much nutrients and concentrate the nutrients on healthy melons, which can also improve permeability and promote plant growth.
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