A hang leaf vegetable apply ammonium nitrate.
Cabbage, Chinese cabbage, leeks, and nitrate nitrogen fertilizers are easily absorbed. If ammonium nitrate is used, green leafy vegetables absorb nitrate ions. Long-term consumption of nitrates into the human body can cause cumulative poisoning.
II bogey urea after watering.
The nitrogen contained in urea is amide nitrogen. Amido nitrogen is converted to ammonium carbonate or ammonium bicarbonate by the urease enzyme secreted by the soil microorganisms. It is absorbed and used by vegetable roots, or the soil is adsorbed and stored. If urea is applied immediately after it is watered or it encounters rain, the nitrogen in the amide state will be lost. Therefore, whether urea is used as a base fertilizer or as a top dressing, it should be applied for 5-7 days after it is applied, so that it can be fully converted and then watered. So as not to cause loss.
Three avoid repeated application of ammonium sulfate.
In acidic soils or in calcareous fields, continuous application of ammonium sulfate will make acidic soils more acid and cause calcareous soil compaction, which will prevent the normal growth of vegetables.
Four bogey vegetables in the absence of water application of ammonium bicarbonate.
Ammonium bicarbonate is extremely unstable and volatile, especially in drought and water shortages. Therefore, in the application of ammonium bicarbonate in vegetable fields, regardless of whether it is used as base fertilizer or top dressing, deep application should be carried out under the condition of moist vegetable fields, and the soil shall be covered immediately after fertilization. In case of dry weather, water may be poured or watered after application.
Five bogey green leaf spray high nitrogen fertilizer.
For example, the spraying of leaf surface with urea, ammonium sulfate, etc., can make the young leaves of the vegetable fat, the color is beautiful, and the yield increase is significant, but the content of nitrate on green leafy vegetables will also increase significantly, making the food contaminated and affecting human health.
Six bogey do not understand the characteristics of chemical fertilizers, improper use.
Before using a certain kind of fertilizer, it is necessary to master the characteristics of the fertilizer before it can be used according to its characteristics. If urea is not easy to be converted when the ground temperature is lower than 15°C, it cannot be effectively absorbed by vegetables; nitrate nitrogen fertilizer is easily leached by water and should not be applied in depressions and aquatic crops; ammonium chloride, potassium chloride should not be used in chlorine crops. .
Hybrid Stepper Motors,Brushless DC Motors,Linear Motor,Gear Motor,Step-Servo Motors,Brushless Motors
Changzhou Satidi Import and Export Co., Ltd. , https://www.guanjiejt.com