When to Fertilize Grapevines
This introduction covers the related content of when to fertilize grapevines, including the best time for fertilizing grapevines. Detailed information is provided below.
1. Germination fertilizer. In early spring, when the buds start to swell, a small amount of nitrogen fertilizer can be applied near the roots. This allows the roots to absorb it, promoting the growth of robust new shoots and increasing yield. Fertilizing at this time is crucial.
2. Weak branch supplement. After the grapevines go through winter dormancy, they need to quickly replenish nutrients in the spring to promote even germination. A high-nitrogen, high-phosphorus, low-potassium water-soluble fertilizer can be used, with an application rate of 10-15 kg per mu. Alternatively, a water-soluble fertilizer containing humic acid or fulvic acid potassium can be chosen, as it can supplement the elements needed by the grapevines and also increase soil temperature, promoting early germination.
3. Fruit expansion fertilizer. After the grapes have set fruit, when the berries are the size of mung beans or soybeans, apply this fertilizer. It should be mainly nitrogen-based, with added phosphorus and potassium. This application should be large, accounting for about 50-60% of the total annual chemical fertilizer usage.
4. Color change fertilizer. The fruit color change period is particularly important in the annual management of grapevines. Potassium fertilizer can promote fruit color change and sugar accumulation. Before the fruit softens and starts to change color, top dressing should begin. This period is crucial for grape coloring, sugar content increase, and organic matter accumulation, with potassium fertilizer effectively promoting increased sugar and coloring.
The above information provides a comprehensive explanation of when to fertilize grapevines and the best time for fertilizing grapevines. Hope it helps you.