What is the reason for uneven coloring of grapes? How to fertilize and water grapes during the color conversion period

The grapes in Luan Guojun's family encountered a strange thing during the mature period. For some reason, the grapes in the vineyard were green, red, purple, really colorful and varied. Does this have anything to do with the method of growing grapes? Seeing that the grapes in other farmers' homes were ripe and taken away by grape merchants, his grapes could not reach the ripe standard and could not be sold. Even if one or two vendors occasionally entered the garden, he smiled directly and turned away, which made Luan Guojun feel very unhappy.

Later, after he invited the agrochemical personnel from the local agrotechnical station to check on the spot, he realized that he had applied too much nitrogen fertilizer, causing the grapes to grow too much, causing the fruit trees to grow late and affecting the normal ripening and coloring of the grapes.

In view of the uneven color of grapes, agrochemical personnel also put forward some management suggestions to Luan Guojun:

1. Pruning branches and leaves

The luxuriant branches and leaves and shade of fruit trees will cause poor light and air permeability of the garden, which will affect the normal coloring and sweetness of grapes. According to the actual situation of the fruit trees, prune the branches and leaves of the trees, cut off the dark branches and old leaves in time, and provide sufficient light and air space for the grapes.

2. Fruit thinning and yield control

Fruit trees are not the more fruit, the better, the tree load is too large, will affect the normal supply of nutrients, easy to cause grape ripening, coloring difficulties. Therefore, it is necessary to reduce the ears and spikelets with too much fruit or bad appearance in time, so as to ensure the normal nutrient demand of grape coloring while ensuring the yield.

3. Scientific use of fertilizer

Potassium and phosphorus are relatively high nutrients for grape growth, which should be replenished in time during the ripening period to provide energy for fruit trees, promote anthocyanin accumulation and improve grape chromaticity. In the later stage, there should be little or no application of nitrogen fertilizer, too much nitrogen fertilizer will cause branches and leaves to grow too long, green and late ripening, affecting the ripening time of grapes.

4. Moisture control

During the ripening period of grapes, it is easier to increase sugar content and color in a relatively dry environment, so it is necessary to control the water use of the orchard appropriately, but not too much.

5. Control the growth

Grasp the growth of fruit trees, moderate fruit trees are the easiest to color. The excessive growth of fruit trees will make it easy for nutrients to transfer to the branches, and too weak trees will make it easy to supply nutrients, which will affect the normal coloring of grapes.

6. Reflection of plastic film

In order to better help the grape coloring, you can spread the plastic film on the ground of the grape root, and make use of the reflective effect of the plastic film to make the grape more evenly colored.

Will this happen to your grapes? When you encounter such a situation in the future, you can take the above method.