Progressive Lubrication System Yantai Ciso Lubrication Technology Co.,LTD , https://www.cisolubrication.com
In order to realize the comprehensive effect of spring wheat topdressing, not only the nitrogen fertilizer varieties must meet the requirements of strong water solubility and quick effect, but also strictly control the supporting fertilization technology, and strive to avoid nitrogen volatilization and leaching loss.
The nitrogen fertilizers currently available on the market include urea, ammonium bicarbonate, ammonium chloride, ammonium sulfate, ammonium nitrate and ammonium urea. They are all water-soluble quick-acting nitrogen fertilizers, which are suitable for wheat topdressing and fertilizer application, and the fertilizer efficiency is also relatively fast. However, in terms of the quantity of supply, urea is the most, followed by ammonium bicarbonate. The two are the most widely used nitrogen fertilizers in China's current grain production. The agrochemical characteristics of urea and ammonium bicarbonate are very different, although the general trend is that urea is used as the mainstream. However, farmers everywhere have different evaluations and choices. For example, some farmers in Quzhou County, Hebei Province, have a good response to ammonium bicarbonate. They think that ammonium bicarbonate has a fast fertilizer effect, early seedlings and low prices. However, there is less and less carbon ammonium on the market, and urea has to be used instead. In more areas, grain farmers have become accustomed to using urea as a top dressing.
Urea, ammonium bicarbonate, ammonium chloride, ammonium sulfate and ammonium urea are applied as top dressing. In the fertilization method, nitrogen fertilizer should be applied to less than 5 cm, and the soil should be re-watered to prevent the loss of ammonia in the ammonia nitrogen fertilizer. After the urea and ammonium bicarbonate are sprinkled on the surface of the earth, it is raining or using large water to wash the surface of the earth. Because the surface of the fertilizer particles is dissolved, the fertilizer is converted into ammonia and runs away. The difference is that when urea is used as a top dressing, the application time should be appropriate several days in advance. Because the actual fertilizer efficiency of urea is slower than ammonium sulfate, ammonium bicarbonate and ammonium chloride. As for the soil temperature at the time of a few days in advance, 7 to 8 days at 10 ° C, 4 to 5 days at 20 ° C.
(Cao Yiping, Professor of China Agricultural University)
Farmers Daily
Selection of Spring Fertilization and Casting in Wheat
After the spring, winter wheat will enter a period of rapid growth. From rejuvenation to flowering, through the characteristics of vegetative growth and reproductive growth, in order to achieve the purpose of increasing ear, strong stalk and ear and large spike, spring topdressing is very important. Measures. The spring topdressing of winter wheat is carried out in combination with watering, and water-soluble quick-acting fertilizer is generally used. From the chemical traits of common fertilizers, the agrochemical traits of phosphate fertilizer and potassium fertilizer are stable, suitable for base fertilizer and seed fertilizer. They are all applied to the soil before sowing. The nitrogen fertilizer habit is lively and unstable, regardless of whether it is applied to the surface or soil. As long as the quantity is slightly larger, it is easy to cause loss and waste. Therefore, nitrogen fertilizer is not suitable for one-time base fertilizer application before planting. It needs to be applied in proportions. The base fertilizer is applied at most, and the remaining spring fertilizer application should be applied to improve nitrogen utilization rate and achieve high yield and high efficiency. Therefore, the spring topdressing of winter wheat mainly refers to the application of nitrogen fertilizer. In spring, it is generally unnecessary to apply compound (mixed) fertilizer, unless some farmers use only diammonium phosphate and urea before the base fertilizer, and no compound fertilizer containing potassium. Or some wheat fields with high expected yields and light soil texture and low fertility can be appropriately applied with potash (for example, 5 kg of potassium chloride per mu).
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】