The best application time for seaweed fertilizer Algamas on grapes is mainly concentrated during the bud stage, before and after flowering, during the young fruit enlargement stage, and during the color-changing stage. Different stages can play the roles of promoting root development, maintaining flowers and fruits, and enhancing fruit quality.
1. Bud Stage (from pre-budding to leaf unfolding):
Main function: Promote germination, root system repair, and recovery of grape tree vigor, especially suitable for vineyards with insufficient autumn fertilization or weaker tree.
Usage Method: Apply seaweed fertilizer Algamas (3-5 kg/Ha) via drip irrigation or foliar spraying with water during budding, in combination with high-nitrogen compound fertilizer, and adding humic acid Fumato can enhance effectiveness.
Precautions: For vigorous vineyards, reduce the dosage to avoid excessive growth of new shoots.
2. Before and After Flowering (from flower separation to flower withering)
Main function: Increase fruit set rate, supplement boron, calcium, and other trace elements, alleviate physiological yellowing during flowering.
Usage Method: Five days before flowering, foliar spray with seaweed fertilizer Algamas (diluted 1: 2000 times) and boron fertilizer, focusing on flower clusters.
After flowering, apply seaweed fertilizer Algamas and calcium fertilizer to promote young fruit development.
Effect Verification: In Yunnan Customer garden, the number of fruits set per single cluster increased by 18-22.
3. Fruit Expand Stage (15-17 days after flowering)
Main function: Accelerate fruit enlargement, prevent nutrient deficiency symptoms, improve fruit uniformity.
Usage Method: Drip irrigation or foliar application of seaweed fertilizer Algamas (3-5 kg/ha) togather with high potassium water-soluble fertilizer; foliar spraying may include calcium (such as Amino Ca ) and EDTA Mg fertilizer.