When is the right time to fertilize vine grapes? What kind of fertilizer should I apply? What are the techniques of foliar fertilizer spraying?

The grape is also known as Pu Tao, grass dragon bead, purple cherry, Bodhi seed, mountain gourd, flowering April-May, fruiting August-September. It is cultivated all over the world. When is it appropriate to fertilize the grapes? What kind of fertilizer should I apply? What are the techniques of foliar fertilizer spraying?

When is the right time to fertilize the grapes?

Because grapes are fattening plants, they are fat, grow strong, and bear more fruit. According to the growth results and fertilizer demand characteristics of mature grapes, more nitrogen fertilizer should be applied in the early stage and phosphorus fertilizer in the later stage, at least 4 times in the whole year.

1. Apply budding fertilizer for the first time, after the grape is unearthed

2. After the second application of fruit expansion fertilizer, the grapes set fruit in the middle to late July.

3 、 . The third application of ripening fertilizer, before and after the beginning of autumn, before fruit ripening.

4. Strip fertilizer was applied for the fourth time. After grape harvest, the mid-early maturing varieties were in mid-late August or early September, and the late-maturing varieties were in late September or early October.

What kind of fertilizer should be applied to grapes?

1. Grape base fertilizer: mainly organic fertilizer, the amount should account for 60% of the total amount of fertilizer applied in the whole year, 3000-5000 kg of stable manure or compost per mu, and 700-1000 kg of dried chicken manure sold on the market. 30 kg compound fertilizer can also be added. When applying fertilizer, we should pay attention to the fact that the organic fertilizer must be mature.

2. Topdressing of grapes: carried out during the growing period to promote plant growth and fruit development.

3. Sprouting fertilizer: applied before the sprouting of early spring buds. Mainly available nitrogen fertilizer. Water should be irrigated immediately after topdressing to promote sprouting. Urea or mature human feces and urine can be applied, urea 0.1-0.4 kg / plant, and human fecal-urine fertilizer 8-10 kg / plant.

4. Pre-anthesis fertilizer: fertilizing 7-10 days before flowering, it is appropriate to choose nitrogen, phosphorus and potassium compound fertilizer, 0.1-0.15 kg / plant.

5. Fruit expansion fertilizer: in this period, the combination of available nitrogen fertilizer and compound fertilizer should be achieved, urea 0.1-0.5 kg / plant, nitrogen, phosphorus and potassium compound fertilizer 0.1-0.5 kg / plant.

6. fertilizer for increasing color and sugar: refers to the fertilizer applied before or at the initial stage of fruit color change, mainly phosphorus and potassium fertilizer. Potassium sulfate 0.2-0.4 kg / plant can be selected.

What are the techniques of foliar spraying on grapes?

1. Suitable period: generally speaking, foliar fertilizer can be applied throughout the growing season of grapes. It is best to spray "shoot-promoting fertilizer" before new shoot growth, "stable flower and fruit fertilizer" during flowering and fruit setting period, and "strong fruit fertilizer" during fruit expansion period. The effect of boron spraying at flowering stage is good, and the effect of spraying rare earth micro-fertilizer at the initial stage of berry softening is great.

2. Weather and time: foliar fertilizer spraying is greatly affected by wind, air temperature and humidity. In a certain range, the higher the temperature is, the faster the leaf absorbs fertilizer; the greater the humidity, the more fertilizer is absorbed; the smaller the wind speed is, the longer the wet time of fertilizer liquid on the leaf is, the more fertilizer is absorbed and the smaller the drift loss is. In order to improve the effect of fertilizer spraying, it is best to spray in cloudy days without wind, and in sunny days in the morning or evening with suitable temperature (18 ℃ ~ 25 ℃), higher humidity and less evaporation.

3. Methods: the cuticle of the young leaves of grape is thinner than that of the old leaves, and the infiltration of fertilizer and liquid is larger, and the stomata on the back of the leaves are more than those on the front, and the absorption is faster. Therefore, the application of foliar fertilizer to grape should be based on tender shoots, young leaves and back of leaves. Spray fertilizer to strive for fine fog particles, in order to facilitate uniform and dense distribution, spray to all the leaves moist, fertilizer liquid to drop but not fall is appropriate. According to the need, a variety of fertilizers can be mixed and sprayed, and it can also be mixed with pesticides (including plant growth regulators) to prevent diseases and insect pests.