1. Long-term management from the stage of branching and setting potatoes to stems and leaves: this period is the stage of branching and seedling growth, root growth and potato setting. The focus is on controlling vines and promoting branching. 40 to 45 days after planting, the water demand is not much, and the field can be kept moist. After the stems and leaves are sealed, the water demand is the most, and the soil water holding capacity should be maintained at 70% to 80% of the maximum water holding capacity, and "horse water" should be irrigated as appropriate.
2. It depends on the seedling topdressing to promote potato fertilizer: reapply potassium fertilizer in combination with large soil cultivation around 60 days after planting, generally 6 kg of potassium sulfate per mu (about 60% of the total amount); nitrogen fertilizer, 5 kg of urea (total 50% of the dosage). Avoid steep growth. For steep-growing seedlings with long stems and leaves, dark green leaves, too long petioles, and too many hairy roots and firewood roots, take the vine lift by gently lifting the potato vine and then returning it to the original place. Combining cultivating and vine tipping measures to reduce field humidity, improve ventilation conditions, inhibit the growth of stems and leaves, and promote root swelling. Avoid turning vines. Turning vines can easily damage the base leaves, reduce nutrient production capacity, disrupt the uniform distribution of leaves, weaken the photosynthetic efficiency of leaves, affect nutrient operation and accumulation, and reduce yield.
3. Management during the period when the stems and leaves grow to the tuber swelling: This period is an important period for the tuber to swell and the nutrients are sufficient to accumulate to the tuber. The focus is on maintaining the balance growth period of the above-ground and underground parts of the sweet potato through water management to prevent moisture Too much causes excessive growth. Therefore, attention should be paid to dredging ditches, flooding and waterlogging, drought irrigation, and preventing and controlling pests.
4. Management from tuber expansion period to before harvest: This period is mainly an important period for the accumulation of tuber starch. During the prosperous period of tuber, from the peak of stem and leaf growth to maturity, the growth of the base leaf gradually slows down, the leaf color turns pale, and then the growth stops. The growth center turns into a flourishing tuber. Apply long vine fertilizer to the field with yellow leaves and premature decay. Use 200 grams of potassium dihydrogen phosphate + 500 grams of urea to spray 40 kilograms of roots with water twice. At the same time, it is necessary to clean the ditch and drain to prevent rotten potatoes, or around 90 days after planting, if the growth potential of the ground is weak, use a small amount of nitrogen fertilizer (about 2 kg of urea) per mu to spray or spray to prevent premature aging, pay attention to timely Fill the horse water. Generally, no water is irrigated 20 to 30 days before harvest to facilitate the harvest and storage of sweet potatoes.
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