As the saying goes: "There is no flourishing wheat." Before the winter wheat seedlings prosper, the growth period can be advanced, nutrient accumulation can be reduced, and the cold resistance can be reduced, which is not conducive to safe wintering. According to the prosperous reasons, wheat can be divided into four types before winter:
Seedlings with weak seedlings formed too early are narrow, long, draped, and lack of tillers. The main stem and a part of the big sorghum are differentiated into spikelets before the winter; this type of vigorous seedlings are often weak after wang and meet -10 in winter. When the temperature is low for about 5 hours at °C, freezing injury occurs. Management measures: timely suppression. Repression can inhibit the growth of the main stem and the big salamander and control leggy. When repressing, it is necessary to pay attention to choosing a sunny day. In the morning, when frost or dew does not dry, it can not be suppressed to avoid injury. Immediately after repression, we cut off and combine with watering to apply 15 kg of ammonium bicarbonate; if necessary, we spray with 0.2% to 0.3% of Chlormequat solution on the foliar surface, which can also suppress strong growth and resist freezing injury.
Seedling seedlings formed due to excessive sowing have crowded growth, poor individual development and few tillers. Management measures: The first time to sparse seedlings, establish a suitable group structure, and promote individual development; combined with watering, supplement the appropriate amount of nitrogen and phosphorus quick-acting fertilizer, to make up for excessive consumption of soil nutrients.
Fermentation of water with excessive seedlings of Wangmiao seedlings was more than usual, and the leaves were large and the field was extremely deterrent. Management measures: Deep rooting. When the main stem of the wheat seedling grows 5 leaves, it is 5-7 cm deep between the rows of wheat, cut off some secondary roots, control nutrient absorption, reduce tillering, and cultivate strong seedlings.
The emergence of some spring and weak winter varieties of Wang Miao caused by inappropriate selection of varieties will also lead to prolonged winter. Such seedlings are most susceptible to freezing in winter. Management measures: On the basis of early demarcation and repression, pre-winter soil encircling the roots, or cover "moncure", to protect the wheat seedlings safe winter.
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