What Are the Measures to Improve the Coloring Ability of Grapes?

1. Reasonable Fertilization

• According to the law of fertilizer demand of grapes, generally more nitrogen fertilizer is applied from germination to flowering, which can promote the formation of flower buds and improve the fruit setting rate.

• During the berry growth period, more phosphorus and potassium fertilizer can be applied appropriately.

2. Rational Irrigation

• Proper control of irrigation is conducive to grape coloring and branch maturity.

• Drainage in case of waterlogging and proper irrigation in case of drought shall be ensured.

  
  

3. Increase Light Transmittance

• In spring, shoot wiping and shoot fixing should be done well, in summer, pinching and ear trimming should be done well, and in autumn, shoot pulling and thinning should be done well.

• It is necessary to remove the large leaves covered on the ears, so as to open the light path and direct light into the grape frame, so as to facilitate the fruit grains to be colored.

4. Prevent Frostbite

• Wrap the branches with straw or film

• Spray plant antifreeze on the branches

• Properly postpone the time of digging soil and exposing vines

• Irrigation cooling

5. Circumcision

Before berry coloring, perform ring cutting at the base of the bearing parent branch or the bearing branch, which can promote berry coloring and ripen 7-10 days in advance.