Causes and Countermeasures of Dead Seedlings in Wheat Field

Winter wheat dead seedlings occur year after year. However, the recent death of the wheat field near the jointing stage in our province is relatively rare. Since mid-March, consultations have reflected the increasing number of winter dead seedlings. There are farmers in Shijiazhuang, Baoding, Quzhou, and other places, and the serious field mortality rate accounts for 2/3.

First, the type of dead seedlings is the first type of empty hanging seedlings, such as the village of Yuchengzeng. After the spring wheat field has been watered for half a month, it has been found that there is no new root in the seedlings and the seedlings have begun to die. The second is to plant two varieties of the same land, one of which was dead and the other, Shixin 733, grew normally. The third is that in the field of dead seedlings that have been emptied with frozen water, it is normal for them not to be poured. Dead Miaotian wheat seedlings are black roots and yellow leaves. The variety is still Shixin 733, making farmers feel very strange. The fourth is to die after a return to green, rotten root, yellow heart. The situation of dead seedlings is more complicated.

Second, the reasons for the analysis are mainly several issues. The first is related to sowing. As a result of continuous rains for several days in early October last year, planting was delayed. The seedlings are small and there are few tillers, and some of the field seedlings are wintering. Weak seedlings are the characteristics of seedlings this year. The second is related to the winter nature of wheat. For example, if wheat chooses a species with weak winter and shallow tillering festivals, it will be vulnerable to great temperature and temperature differences. Therefore, when you look back at the green seedlings that are no problem, they are already not healthy enough. If the drought or the water temperature is low, they will die immediately. The third is related to the soil moisture at the time of sowing. Because of continuous precipitation, the soil moisture is high, which is conducive to the occurrence of soil-borne diseases, and in particular, re-frozen frozen water, and the humidity is suitable for onset. In the monitoring survey in early March, the occurrence of root rot in the spring was more common than in previous years. Statistics show that 4 out of 6 cities are sick. Among them, the rate of rickets was 1.3%, Xingtai 3.95%, Hengshui 0.27%, and Chenzhou 0.05%. The rot root disease should be root rot, the occurrence is a piece of distribution characteristics, serious will die. The fourth is the spring temperature and humidity. The temperature in the spring has dropped and it has fallen to 3°C in the first few days. The maximum temperature before cooling down is 24°C. Weak young wheat seedlings are inevitably hurt. Since the spring, our province is windy, and most of the wheat areas have no precipitation. Farmers want to water, afraid of the severe cold in recent years. Therefore, some weak fields that should have grown early have not been managed in a timely manner. There may be other causes for the death of Miaotian. Specific to a plot may be caused by a combination of several factors.

Third, it is recommended that according to the study, the rate of dead seedlings below 10% will have little effect, while higher than 20% will cause a reduction in production. Dead seedlings rate of 30% to 50%, serious reduction in production. Ask farmers to refer to indicators and dispose of their own fields as appropriate. The countermeasures are as follows:

1. For fields where the situation is not so severe, water and fertilizer management should be strengthened. Pay attention to temperature changes, and continue to water and fertilize on sunny days. Avoid significantly lower ground temperature and affect the root system.

2. For the occurrence of root rot (or sheath blight) fields and air-suspended Miaotian should be sprayed with a combination of fertilizer to regulate, promote hair roots, restore growth and inhibit the spread of the disease.

Prescriptions for prevention and treatment: Love more than 6000 times liquid + 600 times liquid green wind 95 + 1% urea fluid + fungicides (mu with 15% triadimefon WP 150 ~ 200 grams, or 50% carbendazim WP 500 grams, or 12.5 % of wolfberry fruit wet WP 50 grams, 50 to 70 kilograms of water) Shun wheat ridge sprinkling in the stem base of wheat, the interval of 7 days and then prevent a good effect.

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