What fertilizer is good for grape topdressing?

Grape topdressing time

Nitrogen fertilizer can be applied once before the grapes sprout, such as decomposed human feces, urea, ammonium bicarbonate, ammonium sulfate, etc. The second topdressing can be done after the fruit sets, with human feces or nitrogen, phosphorus, and potassium compound fertilizers or urea. The third topdressing is done when the fruit begins to color, mainly potassium fertilizer, combined with an appropriate amount of phosphorus fertilizer to improve the quality of the fruit. Phosphorus and potassium fertilizers are applied after harvesting.

What fertilizer to use for grape topdressing

After the grapes sprout, nitrogen, phosphorus and potassium compound fertilizer can be applied. After the flowers fall, fruit enlargement fertilizer, namely urea, phosphorus fertilizer and potassium fertilizer, can be applied during the young fruit enlargement period. Potassium sulfate and diammonium phosphate can be applied before the fruits mature and are harvested.

Should urea or compound fertilizer be used for grape topdressing?

For topdressing grapes, you can consider using compound fertilizer, which contains more nutrients and the fertilizer effect of many compound fertilizers is longer-lasting than urea, which is very helpful for grapes. At the same time, for crops with more vigorous growth, urea can be used as topdressing, and the effect will be more obvious than compound fertilizer. From a cost perspective, urea is more cost-effective.

Grape topdressing method

The principle of grape topdressing is to apply organic fertilizer and inorganic fertilizer in combination to meet the various needs of the plants. A reasonable ratio of nitrogen, phosphorus and potassium fertilizers can also increase yield. In addition, fertilization methods are generally divided into three types: basal fertilizer, root topdressing and foliar topdressing.

During the growth period of grape vines, germination fertilizer, pre-flowering fertilizer, fruit-enhancing fertilizer, coloring fertilizer and topdressing after harvest are needed. The amount of fertilizer applied varies at different stages.

Grape vines can be topdressed with germination fertilizer in early spring in February, mainly nitrogen fertilizer. Pre-flowering fertilizer is applied at the end of April. Nitrogen fertilizer and phosphorus fertilizer can be applied when watering. The amount of fertilizer required during the fruit-growing period is relatively large, mainly nitrogen fertilizer and potassium fertilizer. In order to better color and improve fruit quality, appropriate application of potassium fertilizer and magnesium fertilizer is also required. Ternary compound fertilizer can be used after harvesting.

Precautions for grape topdressing

When fertilizing grapes, be careful not to apply the base fertilizer too shallowly, otherwise it will cause seedling death. Secondly, apply fertilizer appropriately during germination to avoid yellowing of leaves. Also, the more fertilizer is not necessarily better. Fertilizer should be applied reasonably. Finally, do not apply fertilizer too close to the trunk. Also, pay attention to watering after fertilizing.