Nitrogen is one of the nutrient elements with greater demand for grapes. It takes about 0.3-0.6 kg of nitrogen for every 100 kg of grapes produced. Nitrogen fertilizer has a great influence on the growth and development of vines.
The application of top dressing of grapes is generally carried out in four periods before germination, before flowering, after flowering, and before berry coloring.
1. Topdressing nitrogen fertilizer before germination is mainly to promote the development of branches and ears and expand the leaf area of ​​grape vines without base fertilizer.
2. For grape vines with more flower spikes, nitrogen fertilizer and a certain amount of phosphorus and potassium fertilizers should be applied before flowering, which can increase the ears and reduce flower falling. The amount is about 1/5 of the annual application.
3. After flowering, when the size of fruits such as mung bean grains, the application of nitrogen fertilizer can promote fruit development and adjust the growth of branches and leaves.The dosage is determined according to the growth trend.When the growth trend is relatively strong, the dosage should be small. Bigger. Generally it is 1/10 ~ 1/5 of the annual application.
4. In the early stage of fruit coloring, a small amount of nitrogen fertilizer and phosphorus and potassium fertilizers can be applied appropriately to promote the increased sensitivity of the berries and the increase in sugar content, increase the color of the fruit, improve the surface quality of the grape seedlings, and apply Phosphorus and potassium fertilizers are the main sources, and the amount of nitrogen fertilizer is about 1/10 of the annual application.
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