Autumn sweet potato field management has four strokes
After cultivating sweet potato seedlings for 7 to 10 days, it's time to start fertilizing. Apply 20-30 kg of livestock manure water along with 10-15 kg of ammonium bicarbonate or 5 kg of urea per mu. For better results, use 7-10 kg of high-efficiency compound fertilizer (40% efficiency). This helps promote healthy growth and strong root development. At the same time, apply 100-150 kg of mixed planting ash and 25-30 kg of calcium superphosphate into the pond. Avoid applying any direct bottom fertilizer—only use high-efficiency compound fertilizer when raising seedlings with human and animal waste water. To supplement micronutrients, spray 0.5 kg of 21.8% zinc sulfate or 0.8 kg of compound zinc fertilizer in 50 kg of water as a foliar spray. In early October, apply 100 g of potassium dihydrogen phosphate and 150 g of urea per mu, using 50 kg of water for 2-3 foliar sprays to enhance tuber formation and overall plant health.
Once the sweet potato seedlings have established themselves, it's important to prune them properly. Cut off the shoots and remove all the tips of the seedlings. This encourages more branching, increases leaf production, and improves the plant structure, which is essential for maximizing tuber yield. Important: Do not twist the vines or "hit the vines," as this can damage the plants. Use this opportunity to manage the plants by removing weak roots and controlling excessive elongation, which helps maintain a compact and productive growth pattern.
Another key step is to prevent waterlogging. Always keep the ditches clear and repair the ridges to ensure there is no standing water in the furrows. This helps avoid root rot and other water-related diseases, especially during heavy rains or flooding periods.
The final step is timely harvesting. It's best to harvest sweet potatoes around mid-November. The tubers can be used for planting, consumption, or feeding. The vine tips can be harvested as vegetables, while the leaves can be made into silage for animal feed. Note that harvesting too early or too late can reduce yield, quality, and storage ability. If possible, dig up fresh potatoes earlier to take advantage of market demand and ensure optimal storage conditions.
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