When applying inorganic fertilizers to vegetables in greenhouses, there are often the following misunderstandings, which not only reduce fertilizer efficiency, but also bring some negative effects, which are worthy of attention. 1. Apply ammonium bicarbonate and ammonium sulfate in the shed in winter. Ammonium bicarbonate will volatilize a lot of ammonia after application, which is not good for vegetable growth; ammonium sulfate is a physiologically acidic fertilizer, which will increase the acidity of the soil after application. When applying ammonium bicarbonate, pay attention to deep application. Generally, a 10 cm deep ditch is opened 8-10 cm away from the vegetable roots. After spreading, cover with soil, which can increase the utilization rate by 10%-30%. 2. Apply diammonium phosphate more in winter. Vegetables need a lot of nitrogen and potassium, but less phosphorus. For example, the ratio of nitrogen, phosphorus and potassium required for eggplant is 3:1:4, cucumber is 3:1:10, tomato is 6:1:12 and so on. Diammonium phosphate contains 18% nitrogen, 46% phosphorus, and does not contain potassium. Therefore, it is not appropriate to use diammonium phosphate for greenhouse vegetables. In addition, it should be noted that diammonium phosphate must not be mixed with alkaline fertilizers such as plant ash, so as to avoid the volatilization of ammonia and cause ammonia damage. 3. Topdressing potassium fertilizer in the late growth period. Vegetables generally require more potassium before and after flowering, and then gradually decrease. The later application of potassium fertilizer will significantly reduce the utilization rate of potassium and waste fertilizer. 4. Fertilize under drought conditions. Vegetables like water. Applying fertilizer when the soil is dry will not only not give full play to the fertilizer effect, but will also cause the concentration of the soil solution to rise suddenly, making it easy to burn the roots of the vegetables. Therefore, fertilization in the greenhouse should be combined with irrigation, fertilization should be opened in the furrow, and the fertilizer should be buried before irrigation, or flushed along the water. 5. Apply iron-containing fertilizers to the soil. Iron is easily converted into insoluble compounds by soil fixation and cannot be absorbed and utilized by vegetables. Therefore, when iron fertilizer is applied in the greenhouse, foliar spraying is used. It can be sprayed evenly on the surface of vegetable leaves with 0.1%～0.3% ferrous sulfate solution. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Disposable Paper Toilet Seat,Disposable Toilet Seat Covers,Disposable Sanitary Toilet Seat Cover,Disposable Paper Seat Cover RFX+CARE Manufacturing Co.,Ltd. , https://www.rk-rfxcare.com