What causes the yellowing of grape leaves in early spring
In the process of planting grapes, the leaves of facility grapes often show yellowing in early spring. Some fruit growers believe that the grapes are lack of iron and thus blindly supplement iron. This is wrong. So, what is the reason for the leaf yellowing of the facility grapes in early spring, and what are the measures?
Yellowing of grapes during germination: It 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: 1. The yield of the previous year was too high and the harvest was late. 2. Too much nitrogen fertilizer. 3. Inadequate pest control in the late last year. 4. Fertilizer damage in the last year caused a large number of root deaths.
Prevention
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. Spray foliar fertilizer. Spraying natural plant vitality liquid 1000~5000 times or Bilong 800~2000 times dilution can effectively control.
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. At this time, a large amount of flooding will reduce the soil temperature, the soil is not air-tight, and the roots cannot breathe smoothly and can not better absorb nutrients, which leads to the grapes on the ground. Partial yellowing.
Prevention
1. Uncover the film and expose it to the sun, loosen the soil and ventilate, drain and reduce humidity.
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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