The high temperature and rain in summer are beneficial to the growth of various crops. And the sun is abundant, which is conducive to the photosynthesis of the leaves. The carbohydrates produced by crop photosynthesis require large amounts of nitrogen to form amino acids, proteins, and nucleic acids. Summer is a vigorous growth season in which vegetative and reproductive growth of crops alternates. The rapid growth stage of crops requires large amounts of nutrients, especially nitrogen and potassium, so topdressing is required. Field crops mainly apply nitrogen fertilizer, and economic crops such as vegetables, grapes, cotton, etc., in addition to nitrogen fertilizer, also apply potassium fertilizer. For example, for spring corn crops, the urea one-time base fertilizer application is used as a reference, and the other half of urea is used as top dressing and applied at the end of July and early August. The latter's nitrogen fertilizer utilization rate can be increased by 10 to 20 percentage points. This shows that the utilization rate of topdressing nitrogen fertilizer is significantly higher than the application method of all nitrogen fertilizer as base fertilizer. Regarding the method of topdressing nitrogen and potassium fertilizers in summer, the trench must be covered with soil to avoid the loss of nitrogen volatilization caused by the surface application of nitrogen fertilizers and the potassium fixation of potassium fertilizers on the ground due to the alternation of wet and dry conditions. Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone Passenger Counter,Vehicle Passenger Counter,Bus Passenger Counter,Bus Passenger Counting Equipment Vsstech Co.,Ltd. , https://www.vsstechcctv.com