In the process of planting grapes, the leaves of facility grapes often appear yellowing in early spring. Some fruit growers think that this is because the grapes lack iron and thus blindly supplement iron. This is actually wrong. The editor will take you to understand the causes and prevention measures of leaf yellowing in facility grapes in early spring. I hope it will be helpful to everyone.
Yellow leaves when grapes germinate
Causes of yellowing:
The yellowing of grapes during germination is mainly caused by insufficient nutrient storage in the previous year, and there are four main reasons for the insufficient nutrient storage in the previous year: first, the yield of the previous year was too high and the harvest was late; the second was excessive nitrogen fertilizer; It is the inadequate control of pests and diseases in the latter part of last year; fourthly, the fertilizer damage caused a large number of root deaths in the last year.
Prevention and control measures: 1. Water less in early spring: as long as the soil is kept moderately dry, it is also necessary to loosen the soil for ventilation, increase the soil temperature, and promote the development of the root system.
2. Spraying foliar fertilizer: spraying natural plant vitality liquid 1000-5000 times or Bilong 800-2000 times dilution can effectively prevent yellowing of grape leaves in early spring.
Normal at germination, leaves yellow before flowering
Causes of yellowing:
The yellowing of leaves in greenhouse grapes in early spring is mainly due to excessive fertilizer and water. After the grapes germinate in early spring, the temperature rises quickly, but the soil temperature rises slowly. If a lot of flooding occurs at this time, the soil temperature will be lowered and the soil will not be air-permeable. This will make the root system poorly vigorous, and the breathing will not be smooth, and it will not be able to better absorb nutrients. This leads to yellowing of the ground part of the grapes.
Prevention:
1. Uncover the film and expose it to the sun, loosen the soil and breathe, drain and reduce moisture.
2. Fertilization to relieve symptoms: Because the root system cannot absorb nutrients normally, it can be sprayed on the leaves to timely supplement the nutrients of nitrogen, phosphorus and potassium. You can also use Aisite 500 times liquid to irrigate roots to improve root vitality and promote nutrient absorption.
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