The management of fertilizer and water in greenhouses in winter is very important. If the management of fertilizer and water is improper, it will cause the cabbage to loosen. The autumn lettuce will be close to the harvest and the stems have not yet expanded; the cucumber roots, rotten roots and yellow leaves are not good. This symptom is caused by the lack of fertilizer in the middle and late stages. Therefore, in winter, the management of fertilizer and water in the greenhouse should be strengthened. Fiberglass Measuring Tape,Fiberglass Tapes Measure,Fiberglass Tape Measure,Plastic Fiberglass Measuring Tape Shangqiu Hengli Measuring Tools Co.,Ltd , https://www.jjmtools.com
In terms of fertilization, it is necessary to apply sufficient base fertilizer, and pay attention to the combination of organic fertilizer and inorganic fertilizer, and pay attention to topdressing in the middle and late stages. Vegetables begin to enter a period of vigorous growth, requiring more fertilizer and water, and timely watering and topdressing. Do not blindly increase the amount of fertilization, too much base fertilizer will cause burning seedlings, excessive amount of fertilizer will easily lead to rotten roots and roots.
Watering time: You should choose to water in the morning on a sunny day. At this time, the water temperature is close to the low temperature, the low temperature is easy to rise, and there is sufficient time to drain the water in the afternoon. Generally, it is not suitable to choose at noon to avoid watering at high temperature affecting the physiological functions of the root system. Try to avoid watering in the evening and in the rain, to avoid widespread spread of vegetable diseases. In addition, the fertilizer is transported by moisture. If it is not watered in time, even if the base fertilizer is sufficient, it cannot be fully and effectively utilized.
Pay attention to the amount of watering: when there is too much water, the roots will rot due to lack of oxygen in the soil, and the stems and leaves on the ground will be yellow or even die. When the temperature in the shed is relatively low, the number of watering should be reduced as much as possible, and the amount of watering should be small. Avoid flooding with large water to prevent the roots of vegetables from being caused by low temperature and high humidity.
Control water temperature: Winter greenhouse watering should be directly irrigated with underground well water, and the water temperature for irrigation should not be lower than 2-3 °C. When watering, the water temperature should be as close as possible to the ground temperature, and the water volume should be small. On the day of watering, the ground temperature should be restored as soon as possible. At the same time, try to drain as much as possible. If the humidity is too high, it will easily cause disease.
Pay attention to the choice of irrigation technology: micro-drip irrigation can effectively control the relative humidity in the shed, reduce the occurrence of pests and diseases, maintain effective light and heat resources, and effectively control the amount of water, reduce deep soil leakage and fertilizer loss, improve soil structure and ventilation, Promote crop growth and development.
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