Wheat seedlings that are susceptible to freezing injury in winter

In addition to the temperature, the severity of winter wheat injury is related to the growth of wheat seedlings during wintering. In general, the appropriately sown wheat seedlings grow robustly and have strong cold resistance. Huanghuaihai wheat area is suitable for planting winter and semi-winter wheat varieties, and the middle and lower reaches of the Yangtze River is suitable for planting semi-winter and spring wheat varieties. The average daily temperature dropped to 0°C and wheat began to enter the wintering period. At this time, the main stems of winter cultivars had 6 leaves or 6 leaves and 1 heart. There were 5-7 tillers and 7-10 secondary roots per plant. Semi-wintering cultivars The main stem has 6 leaves, with 3-5 tillers and 5-7 secondary roots per plant; the main stem of spring variety has 5 leaves or 5 leaves and 1 heart, and the single plant has 2-3 tillers, 3-5 The secondary roots can be considered as strong seedlings, and the plants have stronger cold resistance. The ability of cold resistance of wheat seedlings whose leaf age is higher than the above-mentioned indicators is reduced, and the cold resistance of weak seedlings whose leaf age is significantly lower than the above indicators is also lower, but the cold resistance of weak seedlings is better than that of Wang Miao.

Planting seedlings that grow too early and sowing seedlings, seedlings that have not delivered tillages, seedlings that are too dense to produce, seedlings that are thickly planted and cloded in the ground, and wet seedlings that are rotted and rotted, are sown. Dew seedlings, waterlogging seedlings with poor drainage, yellow weak seedlings with insufficient soil fertility, excessively long nitrogen fertilizers with prolonged seedlings, pesticide seedlings caused by improper use of herbicides, dehydration seedlings caused by soil drought, and seeding too deep Thin and weak seedlings, and so on, are all weak in cold resistance, and different degrees of frost damage may occur in winter. It is necessary to strengthen field management before the winter and promote the transformation of wheat seedlings from weak to strong, enhance cold resistance, and prevent freezing and freezing damage in winter. (Director of Wheat Experts Group, Ministry of Agriculture)

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