How to Top-Dress Greenhouse Grapes? A Detailed Guide to Practical Techniques

Grapes are a very popular fruit in our country. Grapes have strong growth ability and can grow normally in most soils. There are now many grape cultivation models, but generally greenhouse cultivation is the main one. When growing greenhouse grapes, you must pay attention to doing a good job of top-dressing. So how should top-dressing be done? Below, the editor brings you greenhouse grape top-dressing techniques. Let's take a look together!

1. Root top-dressing

The first thing to do well is certainly root top-dressing. When the grape plants first sprout, pay attention to applying an appropriate amount of NPK compound fertilizer, with the dosage per mu kept at about 50kg. Then carry out the second top-dressing during the fruit expansion period, generally after the flowers fall. Then carry out the final top-dressing before fruit harvest. The top-dressing method is generally mainly trench application. First, dig fertilization trenches about 35cm on both sides of the planting site, 18cm deep and about 20cm wide, then scatter the fertilizer into the trenches, cover with soil, and water appropriately.

2. Foliar top-dressing

Foliar top-dressing is not only suitable for open-field cultivation; for greenhouse grapes, carrying out foliar top-dressing in the greenhouse can also produce very good results. Foliar top-dressing is generally done about one week before flowering. One week before flowering, we should spray foliar fertilizer about 3 times. The main fertilizers are urea, amino acid compound fertilizer, and Jinbilai and other fertilizers. Then, after the flowers fade, spray foliar fertilizer about 3 more times at intervals of about half a month, to provide sufficient nutrients for grape growth and enhance the growth ability of grape leaves.

3. Carbon dioxide application

Now when growing grapes, the method of carbon dioxide fertilization is also used. Carbon dioxide fertilization means increasing the application amount of organic fertilizer in the soil, then covering the ground with rice straw, improving the soil, and increasing soil permeability, thereby achieving the purpose of raising the carbon dioxide concentration. Then carbon dioxide in the room can also be supplemented through ventilation until it approaches the carbon dioxide content in the atmosphere. 10 a.m. to 2 p.m. is the best ventilation time. Control the ventilation time well according to temperature. If the temperature reaches 25 degrees, then start ventilation, and close the ventilation opening when it drops to 22 degrees.

In addition, we can also supplement carbon dioxide by applying solid carbon dioxide fertilizer. The above is a brief introduction to greenhouse grape top-dressing techniques. The top-dressing work for greenhouse grapes is very important and directly affects the yield and quality of grapes, so everyone must pay much attention. That is all for today's introduction. This article is for reference only, and we hope it can be helpful to everyone.