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Before the fruit matures, grapes are carefully sorted based on the specific characteristics of the grape variety and the development of the vine's foliage. For example, the "Jiufeng" grape variety is prone to flower drop and fruit shedding. To address this, during foliar fertilization, it's important to limit nitrogen levels while emphasizing phosphorus, potassium, and boron. Additionally, considering the nutrient needs during the berry expansion stage, it's necessary to supplement with magnesium, calcium, iron, and manganese, beyond just boron.
Long-term experimental results have shown that applying potassium-based root fertilizers during the coloring phase of the grapes can enhance color development and increase sugar content. It is recommended to apply 3–4 foliar fertilizer sprays before fruiting. In the first two applications, a mixed foliar fertilizer containing phosphorus, potassium, a small amount of nitrogen, along with boron, magnesium, and iron should be used. After that, the focus should shift toward increasing potassium and calcium levels—for instance, by spraying a 0.1% to 0.5% solution of potassium dihydrogen phosphate. In the month prior to harvest, spraying 0.1% to 0.5% calcium nitrate or calcium chelate solution twice can improve the storage and transport quality of the grapes.
This approach ensures that the grapes not only develop better in terms of appearance and taste but also maintain their quality during post-harvest handling. Proper nutrient management at each growth stage plays a crucial role in achieving high-quality grape production. By tailoring fertilization strategies to the specific needs of the grape variety and growth phase, growers can significantly improve yield and marketability.
Agricultural Science and Technology Newspaper
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