Strengthening winter management of vegetables in greenhouse

The low indoor temperature in the vegetable greenhouse in winter can easily lead to chilling damage to vegetables. Li Yuhong, an associate professor at the School of Horticulture, Northwestern University of Agriculture and Forestry Science and Technology, reminded vegetable farmers to correctly distinguish between common physiological diseases and infectious diseases in winter, and to use drugs scientifically to prevent and cure them in time.

The leaves turn yellow-- it's time to keep warm in the greenhouse.

If the indoor temperature in the shed is too low in winter, chilling injury is easy to occur. The reporter interviewed and learned that cold injury often occurs in two situations: one is continuous rainy days in winter, affecting the temperature in the shed, when vegetables are in a state of hunger, resulting in yellowing leaves. At this time, it can be watered frequently with small water to avoid excessive amount of water, and combined with the application of functional fertilizer. The other is that the planting of vegetables in the arch shed is too early, and the planting of vegetables in winter encounters cold weather, which affects the growth of vegetables. At this time, growers need to pay attention to watch the weather forecast, strengthen the heat preservation of the shed, increase the thickness of the mulch, and pay attention to the increase of temperature in the shed during the day. To avoid watering in low temperature weather, amino acid and chitin foliar fertilizer can be sprayed on the leaf surface to improve plant resistance.

There are many abnormal fruits-- the vegetables need to be mended.

Winter is the high incidence period of abnormal fruits of vegetables in greenhouse, mainly in the important period of flower bud differentiation, affected by adverse climate and environment. Flower bud differentiation is a physiological and morphological sign of the transformation from vegetative growth to reproductive growth, which requires higher environmental conditions in this period. After the completion of the physiological differentiation of flower buds, they begin to develop. At this stage, during the period of morphological differentiation, abnormal flowers and fruits are most likely to appear. Growers need to strengthen the supplementary light in the greenhouse in overcast and rainy weather and pay attention to raising the temperature of the shed. Boron fertilizer and potassium dihydrogen phosphate can be sprayed on the leaves to promote flower bud differentiation.

Poor color conversion-it's time for nutrition to be supplied.

There are many factors of poor color conversion of vegetables such as tomatoes in winter, such as low temperature, less light, more nitrogen and less calcium, which will affect the normal color conversion of vegetables. At the same time, there are many conditions that affect the bad color conversion, such as gluten rot, green fruit, brown fruit and so on. The environmental conditions in winter often lead to the serious impact on pigment transformation. Growers need to remove the abnormal fruit as early as possible to reduce plant consumption, wipe the greenhouse film frequently, pay attention to replenishing light in the greenhouse, reduce the amount of nitrogen fertilizer, and supplement trace elements such as boron and calcium on the leaf surface. To ensure that winter greenhouse vegetables can not be affected by climatic conditions, safe production, to achieve the effect of high yield.