Post by ehsanulh125 on Jan 9, 2024 5:48:02 GMT
Since February, the information about the phenomenon of wheat seedling yellowing, drying and dying in the wheat field is often published in the newspapers. 1. Internal cause refers to the ability of wheat plants to resist cold and drought damage. If wheat varieties with poor cold resistance are used for cultivation, the phenomenon of dead seedlings will easily occur in case of freezing injury. The cold tolerance of individual Wheat seedlings sown too early and whose panicles differentiated into two ridges before winter was weak, and the seedlings often died seriously in case of frost damage. In addition, some late sowing weak seedlings are prone to die in case of cold and drought damage due To less sugar accumulated by itself. 2. External factors refer to various factors other than the wheat plant itself, such as adverse climate, soil conditions and inappropriate cultivation methods.
For example, less precipitation in Country Email List summer and autumn, insufficient soil moisture, less rain, snow and more cold wind In winter and spring will intensify soil drought, make wheat tillering nodes in the soil layer with sudden changes in temperature and cold, and lead to wheat physiological dehydration and death. For another example, if the varieties with weak winteriness and shallow tillering nodes are selected, the seedlings will also die when the temperature difference is large due to the influence of soil temperature. In addition, if the seeds are sown too late, too deep or too dense, it is easy to form weak seedlings, which is not conducive to the safe overwintering of wheat. Especially if the soil moisture is insufficient, the winter water is not poured, which is more likely to cause the death of seedlings properly To the combination of cold and drought. 11 There are three symptoms of wheat seedlings that have died: 1. The whole wheat is dry and yellow, but the root system is normal.
The overall growth of wheat seedlings in the field is not vigorous, and the phenomenon of withering and yellowing takes place in irregular flakes. It is difficult to see the presence of green leaves in the seriously withered and yellowing areas. 3. The leaf tip or leaf withers in the form of water loss, but the overall symptoms of withering and yellowing are mild. Wheat whites and yellows in large areas. Who is to blame? Improper planting For example, in the southern region of Huanghuai winter wheat, the wheat sown before and after the cold dew (October 8), due to the high temperature, has different degrees of exuberance. Due to the failure of timely suppression or drug control of wheat Fields, it is easy to cause large areas of frost damage when the temperature drops suddenly. Under the influence of higher temperature, some wheat fields with enough water and fertilizer are also the "worst affected areas" of flowering seedlings. Wangchang wheat entered the jointing stage in advance before dormancy in winter.
For example, less precipitation in Country Email List summer and autumn, insufficient soil moisture, less rain, snow and more cold wind In winter and spring will intensify soil drought, make wheat tillering nodes in the soil layer with sudden changes in temperature and cold, and lead to wheat physiological dehydration and death. For another example, if the varieties with weak winteriness and shallow tillering nodes are selected, the seedlings will also die when the temperature difference is large due to the influence of soil temperature. In addition, if the seeds are sown too late, too deep or too dense, it is easy to form weak seedlings, which is not conducive to the safe overwintering of wheat. Especially if the soil moisture is insufficient, the winter water is not poured, which is more likely to cause the death of seedlings properly To the combination of cold and drought. 11 There are three symptoms of wheat seedlings that have died: 1. The whole wheat is dry and yellow, but the root system is normal.
The overall growth of wheat seedlings in the field is not vigorous, and the phenomenon of withering and yellowing takes place in irregular flakes. It is difficult to see the presence of green leaves in the seriously withered and yellowing areas. 3. The leaf tip or leaf withers in the form of water loss, but the overall symptoms of withering and yellowing are mild. Wheat whites and yellows in large areas. Who is to blame? Improper planting For example, in the southern region of Huanghuai winter wheat, the wheat sown before and after the cold dew (October 8), due to the high temperature, has different degrees of exuberance. Due to the failure of timely suppression or drug control of wheat Fields, it is easy to cause large areas of frost damage when the temperature drops suddenly. Under the influence of higher temperature, some wheat fields with enough water and fertilizer are also the "worst affected areas" of flowering seedlings. Wangchang wheat entered the jointing stage in advance before dormancy in winter.