Prevention of winter wheat seedlings

The causes of winter wheat dead seedlings in addition to meteorological factors, from the perspective of agronomical cultivation, are mainly caused by irrational layout of varieties and improper management of agronomic cultivation.

1, introduced only pay attention to high yield, ignore cold resistance. The winter-type cultivars and spring cultivars were blindly introduced into the planting areas of winter cultivars, thus aggravating the cold-killed dead plants.

2, late sowing crude species, increase frost damage. A farming system is limited by both local heat conditions and production conditions. If customers do not properly expand the wheat area and increase the index of multiple cropping, there will be a large number of late-seeding wheat crops that are extensively cultivated each year. In addition, the varieties will not be matched and the weak resistance will be poor, resulting in serious frost damage.

3, early broadcast prosperous, reduce cold resistance. If the planting is too early and the winter is warmer, the young wheat cultivar grows long and even the weak winter breeds reach the Erlang period before the spikes in winter, and the cold resistance is reduced, resulting in freezing and dead seedlings. For example, in 2004, some wheat areas in Jianghuai and Huaibei provinces of our province were sown with spring varieties due to robberies. In addition, in the case of the warm winter years that are rare for many years, the young panicle development in the winter before the winter has reached the florets differentiation stage, the first and second sections of the base. As a result of the elongation, the large area of ​​wheat suffered severe freezing damage, and the main stem and Oita were frozen to death, resulting in reduced yield.

4, lack of sensation, drought help cold power. In wheat fields with uneven cropping or looting, the bottom saggers are insufficient, the soil is arid, and freezing injury is aggravated.

5, improper watering, adverse winter. Pouring water late in winter caused “Ling-up” dead seedlings. In addition, after watering, it was not timely and scratched, but it was also easy to cut off the roots and pumped dead seedlings.

To summarize the reasons for the overwintering of the above winter wheat, the main methods of prevention should be as follows:

1. Adjust the layout and select wheat varieties according to local conditions. Any good seed requires this condition, and it must be properly used and properly used for the variety. Under normal circumstances, it is necessary to strictly arrange varieties according to the type of species, and according to the soil, fertility, water conservancy, cornices, etc., to arrange several different levels of production, early, middle and late maturing varieties with planting.

2, pay close attention to the early cultivation of strong seedlings. Strong seedlings accumulate more sugar and stronger resistance, which is conducive to safe wintering. All agronomic measures conducive to nurturing strong seedlings can reduce the number of frozen seedlings to a certain extent.

3, to strengthen the management of wintering period, pay close attention to cold insulation measures. The management of wintering management has a direct impact on the degree of freezing and chilling of wheat. Therefore, it is necessary to pour frozen water to prevent drought and drought, to suppress aerial repression, and to prohibit the cutting of green crops and the insolation of livestock.

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