Yellowing of vegetables and leaves, in addition to the causes of injury and the use of hormones, are mostly due to the lack of trace elements, mostly iron deficiency and zinc. First of all, the ground temperature should be raised. If the temperature is lower than 13°C when the shed is pulled in the morning, thick grass curtains and cover insulation and floating membranes shall be adopted. In addition, covering straw and rice bran in the operation line is a good way to ensure constant ground temperature. Due to the lower water temperature in winter, we must pay attention to pouring small water, not when the greenhouse temperature is high, generally choose before 10:00 am, the second day after watering, increase the temperature of the greenhouse 2 °C -3 °C, in order to promote the temperature rise. At the same time, increasing rooting and rooting types of fertilizers, such as chitin and biological bacteria, can not only promote root growth and development, but also improve soil structure, improve the root growth environment, and enhance root resistance.
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