Grapes are a popular fruit , and their cultivation area in China is quite extensive. However, various problems can arise during grape production. Let's explore the reasons why grape leaves turn yellow.
What causes grape leaves to turn yellow?
1. Root growth and development are affected.
Plants exhibiting physiological disorders have small, thin, and yellow leaves, and their roots mostly turn black and withered, indicating severe root rot. Poor root development is related to excessive use of chemical fertilizers , the use of uncomposted organic fertilizers , or overloading the plant with fruit.
2. Imbalance of nutrients
Grape growers often prioritize the use of macronutrients like nitrogen, phosphorus, and potassium when fertilizing grapes, while neglecting or minimizing the application of micronutrients. This improper use of macronutrients leads to antagonistic effects between them, hindering the grapes' absorption of nutrients and polluting the soil.
3. Poor soil aggregate structure and poor permeability
Crop roots cannot grow without air. Good soil aeration plays an important role in root growth, nutrient release, and soil microbial activity. However, compacted soil with poor aeration will hinder root development, especially the development of fine roots, which will affect the absorption of nutrients by the roots and cause micronutrient deficiency, which will show nutrient deficiency symptoms on the leaves.
How to handle this?
1. Apply fertilizer appropriately
By combining macro- and micro-elements, inorganic and organic fertilizers, and chemical and microbial fertilizers , we can achieve complete nutrient fertilization.
2. Spray foliar fertilizer
Depending on the situation, avoid spraying foliar fertilizer during the flowering period, and apply it regularly or irregularly to increase nutrition and improve tree vigor.
3. Apply more soil conditioner
It creates favorable rhizosphere conditions for root growth and development, improves soil aeration, adjusts soil pH, and promotes the rapid formation of soil aggregates.
