How to apply foliar fertilizer to American raisins?

How to apply foliar fertilizer to American raisins? American raisin is one of the most famous grape varieties at present. it is very popular in the fruit market because of its bright color, rich nutrition and resistance to storage. Foliar spraying should be carried out in the middle and later stage of seed growth (from flowering stage to fruiting stage), which plays a good role in promoting large ear and grain size, increasing yield and income, improving quality and so on. This paper introduces the spraying methods of 6 kinds of foliar fertilizer. 1. Urea aqueous solution. When the soil is sandy, the soil is thin, the base fertilizer is insufficient, the plant is short, the growth is weak, and the leaves are yellowing, the leaves can be treated with 0.7% urea solution of 1% concentration from flowering to fruiting stage, which can obviously turn green, increase and thicken the leaves. it has a good effect on improving photosynthetic efficiency and dry matter accumulation, and the average yield is more than 20%. two。 Superphosphate aqueous extract. On the basis of basal application or seed application of phosphate fertilizer, 1.5% / 0.2% calcium superphosphate leaching solution (filtered after soaking for 14 hours and 16 hours) can be sprayed twice at flowering and fruiting stage, which can enhance flowering and fruiting performance and increase grape yield by 12% to 18%. 3. Plant ash water extract. Plant ash is a farm potash fertilizer, which contains more than 5% potassium on average. In the initial period of grape fruit, spraying 5% plant ash extract twice has a significant effect on disease prevention, drought resistance, strong seedlings, improving quality, improving grape quality and so on. 4. Potassium dihydrogen phosphate aqueous solution. Potassium dihydrogen phosphate is a highly efficient compound fertilizer containing phosphorus and potassium. 0.3% potassium dihydrogen phosphate is sprayed on the leaves twice from the flowering stage to the fruit expansion period. 5. Ammonium molybdate aqueous solution. As a trace element nutrition of grape, molybdenum plays a significant role in promoting the utilization and metabolism of nitrogen and increasing the yield of grape, which can increase the yield by more than 15%. The effect of seed dressing with ammonium molybdate combined with foliar spraying is the best, and 0.1% ammonium molybdate aqueous solution can be sprayed twice from flowering to fruiting period. Dissolve ammonium molybdate 1kg to 2kg in 40 ℃ warm water, then spray cold water to the required concentration. 6. Boron fertilizer aqueous solution. Boron plays a very significant role in promoting grape growth and fertilization and pollination, and boron deficiency leads to low grain weight per panicle. Spraying 0.2% boric acid or 0.3% borax aqueous solution on the leaf during the fruiting period could increase the fruit per plant and the average panicle weight by 50 grams. Click to get more foliar fertilizer application methods click to get more fertilizer application methods click to get more grape planting techniques