The leaves on the top of the seedlings of Shangshu 19 were slightly violet, and the petioles and stems were all greenish green with thick stems and short internodes. Potato tube spindle-shaped, red and white meat, starch rate of 22-25% of the spring potato, summer potato 18%, good germination when nursery, emergence and tidy, strong seedlings, disease resistance. After transplanting, they lived fast, had early potato crops, had many tubers, were resistant to stem nematodes, and were highly resistant to root rot.
Business potato 19 planting points:
First, nursery
Sweet potato breeding time is March 15-20, using a small bow shed solar breeding method is the best, not too early, early emergence slow, less emergence, and easy to rotten bed. Seedbed width 1.3-1.5 meters, and avoid wide bed. The next amount of 50-70 kilograms per mu of sweet potato.
Second, fertilization
Sweet potato is a potash-based crop. Fertilization levels based on soil conditions are generally residual nitrogen in the soil, and potassium is generally insufficient to increase potassium fertilizer. The ratio of N, P and K is 2:1:3. Obviously, the absorption rate of potassium is higher than other crops. Specifically, the amount of fertilizer applied to the plots was roughly divided into three types. Farmers should use them as appropriate.
The first type of soil with high soil fertility has no nitrogen fertilizer and no phosphorus fertilizer. Apply 30 kg of potassium sulfate per acre (do not use potassium chloride).
The second type of soil with medium soil fertility is 5-6 kg of urea per mu, 25-30 kg of superphosphate, 20-25 kg of potassium sulfate or potassium sulfate (N, P, K=15, 15, 15 ) Compound fertilizer 25-30 kg per mu.
The third type of soil under the fertility of the soil, apply 15-20 kg of urea per mu, 40-50 kg of superphosphate, 20-25 kg of potassium sulfate. The fertilization method should be used as base fertilizer.
Third, planting density
Spring sweet potato 3500-4000 trees per mu, summer sweet potatoes 4000-4500 trees per mu.
Fourth, control pests
In order to increase the yield and commodity rate, pests and diseases must be controlled and the following work must be done:
1. Seedlings for seedlings should be seeded with hot seeds and soaked in warm water at 51-54 degrees Celsius for 10 minutes.
2. Two kilograms of net insects per acre (or worms are exterminated) are applied before the abutment. In mid-July, it was the golden age of the flies, which was then thrown into the soil with 1 kg of soil per mu.
3, cutting seedlings planted, absolutely can not pull the seedlings to prevent the bacteria into the field, cut the length of about 15 cm, not too long.
The high-yield cultivation of Shangshu 19 seems simple, but it is not easy to do it, but sweet potatoes are easier to grow and manage than other crops.
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