Foliar fertilization is also called extra-root topdressing. After the general fertilization, the amount of leaf surface fertilizer attached is 30% to 60% of the total amount of spraying, and the amount of crop absorption is 40% to 80% of the amount attached. The application of foliar fertilizers for vegetables should be noted: 1. It is best to be performed from 3 pm to late afternoon (as the case may be). At this time, the temperature is low and the humidity is high, which is beneficial to the absorption of the leaves. 2, both sides of the blade should be sprayed on both sides, especially the more stomata leaves of vegetables, the back should be sprayed, because the back of the leaf than the front of the absorption rate is more than 1 times. 3. Adding urea when spraying trace elements can increase the absorption rate of crops and prevent the occurrence of temporary yellowing of crops. 4, can be sprayed with pesticides. This can not only prevent pests and diseases, but also achieve the purpose of fertilization, but it should be noted that phosphorus-containing fertilizers generally cannot be mixed with alkaline pesticides containing lime. 5, spray concentration should be appropriate. Poor concentration results in poor results and high yields of fertilizer. The quality of fertilizer applied is better. For example, when the content of biuret in urea exceeds 2%, the foliar spray fertilizer tends to produce poisoning. 6. The nitrogenous fertilizer demand of leafy vegetables in each growth stage is high, and the nitrogen fertilizer is the main fertilizer for foliar fertilizer; the nitrogen, phosphorus and potassium need to be balanced in fruit and vegetable, and the mixture of nitrogen, phosphorus and potassium should be used for foliar fertilizer; Phyto-potassium fertilizers have a good response to vegetables and bulbs, and phosphorus and potassium are the main fertilizers for foliar application. 7. Fertilizer should be fully dissolved and mixed with water before spraying. If superphosphate is used, it should be soaked with hot water and stirred with superphosphate. After 24 hours, the supernatant shall be diluted with 3% concentration and then sprayed. Zhang Wenqing
Joint Intra-Articular Injection Models
Bandage Model,Wound Dressing Bandage,Medical Bandage
Hongrui Medical Devices Co., Ltd. , http://www.zzcprtrainingmodel.com