Grape fertilization management, fertilization season

1. Base fertilizer

Basal fertilizer is also called base fertilizer, and the total amount of fertilizer applied accounts for more than 70% of the whole year. The main thing is to apply organic fertilizer, use 800-1000 kg of decomposed manure, and do it after the fruit is harvested, which will have a better effect. Applying nutrients at this time can replenish the nutrients consumed by fruiting, help restore the tree's vigor, and enhance its cold resistance, which is beneficial for wintering and next year's growth and flowering. The specific location and depth of fertilization should be determined according to the size of the plant. For younger plants, the fertilizer can be placed closer to the root system; for older plants, the fertilizer should be placed farther away to avoid damaging the roots. Dig a hole of appropriate size, put the fertilizer in, and cover it with soil.

2. Topdressing

1. Germination fertilizer: Germination fertilizer is applied in early spring, probably after February each year, mainly nitrogen fertilizer. Apply 20 kg of urea and 10 kg of superphosphate per mu, either in furrows or holes.

2. Fertilizer before flowering: Fertilizer before flowering is applied in late April every year, mainly applying phosphorus fertilizer and nitrogen fertilizer. Use 15 kg of urea and 10 kg of superphosphate per mu, and water as soon as possible to dilute the fertilizer.

3. Fruit-strengthening fertilizer: This should be applied during the growth period of young fruits. This is the peak period for fertilizer demand, so more fertilizer should be applied. Use 30 kg of urea and 40 kg of potassium sulfate per mu, and the method can be either ditch application or hole application.

4. Coloring fertilizer: Coloring fertilizer is also called ripening fertilizer. The amount of fertilizer is not needed too much at this time. Apply 5-10 kg of potash fertilizer per acre and 2-3 kg of magnesium sulfate.