At the beginning of the new year, when the weather is changeable, it is necessary to seriously strengthen the management of potato seedlings, promote early emergence, strong seedlings, and prolific seedlings, so as to prepare sufficient seed and seedlings for early sweet potatoes. First, cut off the top bud When the temperature rises above 12°C in the early spring, the top buds of the old vine must be cut off in time, leaving about 3 cm at the base, prompting the sprouting of the base. Second, do a good job in cultivator weeding grass must be timely cultivator rake grass, loose seedlings, prompting the underground to open a new root early, long early new leaves; at the same time, by removing the net weeds, clean seedlings, the growth of potato seedlings. Third, timely top-dressing topdressing is early, should be more phosphorus, potassium fertilizer, with the application of nitrogen fertilizer, and promote the growth of potato seedlings stout. Generally, the fire excrement per mu is 1500-2000 kilograms or 1000-1,500 kilograms of livestock manure, 1,000-1200 kilograms of human waste, and 15 kilograms of compound fertilizer. Before emergence, fertilizer should be applied once every 3-5 days, 800-1000 kg of manure per acre should be mixed with double water; after emergence, each time the seedling is applied with thin fertilizer (mixed with human waste and water), such as To speed up the growth of potato seedlings, add 100-200 g of ammonium sulfate or 50-100 g of urea per 100 kg in thin, faecal water, but do not use fertilizer alone, so as not to cause slender and tender seedlings, and it is not easy to survive after plugging. ideal. After the first secondary fertilization, a plant ash or fire soil should be applied to supplement the needs of potato seedlings for phosphorus and potassium. At the same time, we must do a good job in pest control. Fourth, to strengthen the water pipes, prevent frost and less rain in the early spring, to irrigation or drought prevention or watering with a bucket to keep the soil moist, improve the humidity of the seedlings, and facilitate the growth of potato seedlings. In the spring rain season, we must do a good job of trench drainage to prevent water rot, increase soil oxygen, promote the rapid growth of potato seedlings, and change the temperature in early spring. We must prevent low temperature frost, and timely cover straw or plastic before the arrival of low temperature frost. The film protects the normal growth of the potato seedlings. Fifthly, the nursery of mulching film shall be managed flexibly according to climate change. The potato seedlings shall have a high temperature in the noon at noon. The two ends of the mulch must be opened for ventilation and hardening of seedlings so as to avoid burning at high temperature and rainy days. The potato seedlings are not easy to grow roots. Evergreen, it is necessary to cover the mulch with insulation to protect the seedlings, avoid cold and frozen seedlings and frost dead seedlings. In addition, potato seedlings must also be well protected against animal and poultry destruction and rodent damage.
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