What fertilizer should be applied to grapes during the secondary expansion period?

Grape is a fruit that many people like to eat, which can be eaten raw, make raisins, make wine and so on. In the process of planting, when the grape grows to the berry expansion stage, fertilization is particularly important. So, what kind of fertilizer should be applied during the second expansion period of grapes?

What kind of fertilizer should be applied during the second expansion period of grapes?

The mixed application of phosphorus, potassium and nitrogen was the main fertilization in the secondary expansion period of grape. Diammonium phosphate 50 kg + potassium sulfate 30 kg or urea 40 kg + potassium dihydrogen phosphate 30 kg + mature organic fertilizer 10 kg can be applied per mu, and appropriate amount of water can be irrigated after fertilization.

Second, what are the planting techniques of grapes?

1. Soil

It is suitable for loam and fine sandy loam. After selecting the plot, sprinkle fermented dung, then turn about 40 cm deep, ridge along the line according to the row spacing of 1.8-2 meters, in the direction of north-south.

2. Planting

It is generally planted from March to May after the soil is thawed to germinate. The grape seedlings will be planted obliquely to the north according to the plant spacing of 0.7 meters, pour a lot of water after planting, and then cover with 5 cm thick wet grass, covered with plastic film.

3. Temperature

The lowest temperature required for growth is about 12 ℃-15 ℃, the lowest ground temperature is about 10 ℃-13 ℃, the optimum temperature for flowering stage is about 20 ℃, and the optimum temperature for fruit expansion period is 20 ℃-30 ℃. If the temperature difference between day and night is large, the coloring and sugar content are better.

4. Lighting

There should be a certain intensity of light, but not too strong. If the light is insufficient, it will lead to poor plant growth, no fruit or unisexual fruit, poor quality, etc.; if the light is too strong, sunburn disease can be easily occurred, bagging or plant leaves can be used to cover the fruit.

5. Watering

Higher requirements for moisture, but to strictly control water, avoid Rain Water and dew. The water demand is more in the early growth period or vegetative growth period, and less in the later growth stage or fruiting period. Rice straw should be properly covered in water-deficient and drought-prone areas to maintain soil moisture.

6. Fertilization

Base fertilizer, topdressing and foliar fertilization were adopted. The base fertilizer is used after hibernation or harvest, and the topdressing is the application of chemical fertilizer after flowering after rain or watering.

In addition, the grape is a vine, during the growth period, we also need to do a good job of weeding, binding vines, removing tendrils, thinning flowers, thinning fruits and so on.