Sweet potato clever topdressing rapid expansion
From late August to early October, it is the root expansion period of sweet potato tuber, which is the key period of yield formation and needs the most fertilizer, which can be topdressing by the following three methods. 1, hole topdressing method: with a piece of wood, 20-30 cm away from its main root, drill a hole about 30 cm deep, put in an appropriate amount of three-element compound fertilizer, and seal it with wet soil. 2. Crack topdressing method: when cracks appear in the expanded ground of sweet potatoes, 500 grams of potassium dihydrogen phosphate per mu and 400 kilograms of water are added to irrigate the cracks into fertilizer liquid, 0.7-1 kilograms per plant. 3. Foliar topdressing method: 0.3% potassium dihydrogen phosphate solution is sprayed on the leaf, once a week, this method can increase the yield by 18% to 20% per mu.
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Cultivation techniques of Artemisia annua in greenhouse in early spring
It is better to select varieties with strong cold resistance, and it is generally necessary to use 1.5-2kg per mu. Three to five days before sowing, the seeds were soaked in warm water of 30 ℃ for 24 hours. After washing and drying, they were placed under the condition of 15: 20 ℃ to accelerate germination. The seeds were washed with warm water once a day, and the seeds could be sown after germination. Fertilize the whole.
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Sweet potato planting is fastidious
On sweet potato, the distribution of adventitious buds was the most in the head, the second in the middle, and the least in the tail. When arranging potato seeds horizontally or obliquely on the seedbed, master the principle of head-up, tail-down, back-up and belly-down, which can increase the number of seedlings. If the large and small potato pieces are arranged in the same seedbed, the big potato emerges slowly, grows little, the potato seedling is stout and can be arranged.
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