First, the poor quality of soil preparation. The soil preparation, the quality of sowing are not high, the runoff of the surface of the soil is leaking, the running is serious, and the seeding depth is different. There will be a phenomenon of lack of seedlings and ridges, dead seedlings and dead cockroaches, which has aggravated the dead seedlings of wheat in varying degrees. Second, the amount of use is too large. Most of the acres used in autumn last year were more than 25 pounds, and some of the plots even reached 40 pounds, causing large groups of wheat, coupled with pre-winter low temperature, high soil moisture, less light, so that the performance of the seedlings of wheat seedlings fine, The plants are tall, especially the 5th and 6th leaves are slender, the seedlings are weak, and the cold-resistance and drought-resistance ability are greatly reduced. Third, the sowing time is too early and the seedlings are prosperous before winter. The plots were sown before October 8, 2011. The pre-winter seedlings thrived. After spring returning to spring, most of the leaves were white and dry, and the seedlings died. Before October 5, the younger ages of the wheat fields sown in the wheat field were more likely to be overemphasized, and the leaf age of some wheat fields had reached 6 leaves, 1 heart, or 7 leaf ages. Fourth, no repression after sowing and no pouring of frozen water. The corn stalks return to the ground but not the crushed, broken but not bad, the soil is too loose, there is no repression after sowing, the soil is loose, there is more waste, the roots of the seedlings are not in close contact with the soil, and the unfrozen water is not added, the seedling roots are vacant. Severe cooling in winter, the seedlings were frozen and died. In addition, salinity in saline soil can also lead to physiological dehydration and death of wheat. 5. When the frozen water is poured too late, freezing in the wheat field causes dead seedlings. The frozen water is poured too late, the watering ground has been frozen, the water is not easy to infiltrate, and water is frozen in the ground area, and the wheat seedlings will be suffocated. The frozen water should be kept in the cold at night, and the water must completely infiltrate into the soil on the day after irrigation, and the wheat fields should not be allowed to freeze. The specific time is appropriate from the beginning of winter to the pouring of light snow. Six, wheat diseases and insect pests cause dead seedlings. The main underground pests of wheat in the seedling stage are earthworms, cockroaches, and golden worms, and the main insects on the ground are red spiders. In addition, due to the large population of some wheat fields, root diseases may also be aggravated. VII. Drought threats. Some wheat fields and thin sands lack of moisture, coupled with frequent rain and strong winds in spring, and the drought situation has further developed, causing the death of wheat. 8. The use of organic fertilizers that have not been adequately decomposed causes dead seedlings. If not fully cooked straw or organic fertilizer is applied, the growth of wheat seedlings is slow, and the leaves are yellow, like a lack of fertilizer. There are fewer secondary roots in the seedlings and dead seedlings occur in the whole wheat field. Nine, lack of wheat in the wheat field, cold and dry. In some wheat fields where crops are not well-distributed or robbed, there will be insufficient bottom stalks, cold and dry crops, and frozen saplings will be aggravated. Ten, livestock buckwheat seedlings cause dead seedlings. During the winter, the wheat mainly depends on the nutrients stored on the tillers and shoots to maintain its life. If part of the stored nutrients is eaten, wheat seedlings must die. Eleven, cold injury caused by the cold. The rain and snow weather from March 16 to March 20 caused the surface temperature to drop below 0°C, causing frost damage and killing the wheat. The field management of the above wheat fields should be promoted mainly, as soon as possible as soon as possible pouring back to Qingshui, Mushi quickly available nitrogen fertilizer about 50 kg, while spraying foliar fertilizer, promote spring delivery, consolidate the delivery before winter, increase the number of acres; To pay attention to the weather, to prevent and respond to the cold, to prevent the winter cold is the most effective measure is to water before the arrival of the cold wave. After the occurrence of late spring and winter disasters, we must promptly remediate, seize the time to apply topdressing nitrogen fertilizers, promote early-onset seedling growth, and increase the percentage of spikes for small tillers, which is generally about 10 kilograms per urea. The second is cultivating in time, raising the temperature of the ground and promoting the development of the root system so as to increase the number of tillers and make up for the loss of the main stem. Cable Reel,Water Hose Reel,Water Hose Cable Reel,Commercial Water Hose Reel NINGBO QIKAI ENVIRONMENTAL TECHNOLOGY CO.,LTD , https://www.hosereelqikai.com