Grape foliar fertilization is an effective technique where liquid nutrients are sprayed directly onto the leaves, shoots, and young fruits. This method is most beneficial when applied during the late afternoon or early evening, especially on windless and rain-free days. Alternatively, spraying between 8 a.m. and 10 a.m. is also suitable. It's recommended to apply the fertilizer every 10 to 15 days, with a total of 2 to 4 applications throughout the growing season.
About 10 days after the initial application, it's important to re-fertilize, particularly when the fruit reaches the size of a green bean. For each furrow, apply 500 grams of compound fertilizer and water immediately afterward. This step plays a crucial role in supporting both fruit development and shoot growth, so timing is essential for optimal results.
After harvest, it's vital to replenish nitrogen to maintain leaf function, extend leaf lifespan, and boost nutrient reserves in the vine. Two effective methods include foliar sprays and root applications. A foliar spray of 0.4% urea solution works well, with 4 kg of urea per 667 square meters. Both approaches help ensure the vine remains healthy and productive for the next season.
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