Causes (1) Climate factors. The high temperature before winter led to the growth of wheat seedlings. During the winter, the temperature dropped sharply. The strong cooling and continuous cold weather made wheat without cold-resistant exercise freeze. (2) Variety factors. The spring-tolerant wheat varieties are relatively poor in cold resistance, increasing the risk of freezing injury. (3) Seeding factors. The suitable sowing date for wheat in Central and Central Region is from the end of October to the beginning of November, but this period often has continuous rain or continuous dry weather, and it is difficult to guarantee timely sowing. If early sowing will result in prolonged growth of wheat seedlings, the damage to the wheat seedlings will be serious. (4) Tillage factors. In order to rob for planting, extensive farming, wheat seedlings are deeper, seedlings grow longer to form weak seedlings, or soil blocks are large and hard, which is not conducive to the roots under the bar, wheat seedlings to absorb fertilizer and water difficulties, resulting in poor quality of wheat seedlings, while cold air easy Invade the soil under the frostbite roots; uneven seedlings form dewling seedlings, the roots into the soil are vulnerable to freezing damage; channel system is not matched, poor drainage, prone to freezing. (5) Fertility factors. The excessive amount of fertilization at the time of sowing causes the wheat seedlings to prosper before the winter and is prone to frost damage. The lack of fertilizer field blocks the wheat seedlings to be yellow and thin, and has poor cold resistance, and is also susceptible to freezing when the temperature drops suddenly. Defense measures (1) Improve the quality of sowing. The varieties with better cold resistance were selected. Before sowing, 1500-2000 kg of composted organic fertilizer and 35-45 kg of 45% compound fertilizer were used per acre, and the fine soil preparation was performed after deep plowing. Seeds were selected, sun-seed and germination tests were conducted, and seed dressings were used. According to the variety characteristics of timely sowing, a reasonable amount of sowing, sowing depth of 3-4 cm is appropriate to ensure the same depth. (2) Strengthen field management. For fields requiring irrigation after sowing, such as soil compaction, timely cultivating tillage; promptly transfer and thinning and dredging the three channels after seedling emergence, and see seedling wax fertilizer; appropriate repression before the winter to bridge the earth seam to facilitate preservation. In the cold before the winter irrigation, the ground temperature can be raised, the earth seams can be bridged, and the more productive tillers, growers and growers can be promoted. After winter irrigation, fertilizing grass in the field will help prevent wind, frost, heat and moisture. (3) to prevent prosperous winter. For premature sowing of plots, appropriate repression can be carried out to suppress the growth of main stems and big larvae, and if necessary, spray growth regulators; for excessively large fields, they should be sparsely seedlings, and then combined with watering to make up the right amount. Available nitrogen fertilizers and phosphate fertilizers; for fertilizer and water overage, when the wheat seedlings are in the 5-leaf stage, they are 7 cm deep in the rows and cut off some secondary roots to control nutrient absorption. Sodium Gluconate,High Quality Sodium Gluconate,Sodium Gluconate Details SHANDONG BAISHENG BIOTECHNOLOGY COM , https://www.baishengbioproducts.com
Causes of Frozen Damage to Wheat and Its Defense Countermeasures
The type of frost damage caused by freezing of wheat is due to unfavorable weather conditions, and the internal cause is poor cold resistance. According to the period and characteristics of cold injury, it can be divided into four types. (1) During the early winter (mid-mid-December, mid-December), the wheat seedlings did not undergo cold-resistance exercise, and suddenly encountered a sudden temperature drop of 1°C and a minimum temperature of -5°C. The seedlings were of weak quality, poor soil preparation, large soil voids, and drought. The field seedlings quickly faded. (2) During the wintering period (from the end of December to early February, the second year), severe cold currents or alternation of freeze-thaw cycles due to weather disturbances occurred repeatedly. There are two cases. First, the long-term low temperature causes the wheat to wilt in the ground; second, the temperature rises during the winter, and the cold resistance of the young ear growth point of the young wheat seedlings declines. (3) During the period from turning green to jointing (from mid-February to early March), the growth rate of wheat seedlings is accelerated, and the cold resistance is obviously reduced. In case of cold current, dead seedlings are prone to freezing. (4) During the period from jointing to heading of wheat (mid-March to early April), the plants grow vigorously and the cold resistance is very weak. In case of sudden drop in temperature, the plants are susceptible to freezing, and the main stem and some of the large shoots of the big shoots are frozen.