What are the points for attention in the cultivation of purple potato? What is the nutritional value of it?

Purple sweet potato is also called black sweet potato. In recent years, purple sweet potato is very popular in international and domestic markets, and its development prospects are very promising. So what should purple potato planting pay attention to? What nutritional value does it have?

1. Precautions for purple planting

1. Deep ploughing and soil preparation.

Purple sweet potato is a root crop. The swelling of root requires deep and loose soil conditions. Therefore, to obtain high yield, deep ploughing and soil improvement are necessary. Deep ploughing, especially in autumn and winter, significantly increased the yield of sweet potato. Conditions can be universal deep ploughing, such as not universal deep ploughing, can be combined with deep ploughing heart, or combined with winter deep ploughing. The ridge width is 33-40cm for double row planting and 18 - 24cm for single row planting. In order to make full use of light energy, the ridge should be oriented from north to south.

2. Planting time

Spring sweet potato can only be planted when the ground temperature rises to about 16C at 5 cm of topsoil. The specific time is appropriate according to the area. Spring sweet potato in Huainan City should be planted in early May, and cut in June in summer and Hebei. It should be stacked as early as possible to promote yield increase.

3. Planting method.

horizontal shallow insertion is adopt, a 5cm deep groove is opened on that basal plane first, and the leaf of the potato seedling are pushed to the tip of the fungus so as to tightly wrap the seedling base. Put it into the ditch, cover the soil thickness of 5cm, and expose the tip of the seedling about 6cm.

4. Planting density.

4000 plants/mu for spring and 500~6000 plants/mu for summer, plant spacing 20cm.

5. Timely topdressing

Should see seedling fertilizer, base fertilizer insufficient when combined with the first intertillage, with dilute manure irrigation at the base of the plant. If the bacteria are strong enough base fertilizer, no fertilizer can be applied. When cracks appear on the Chinese surface, expansion fertilizer should be applied in time. 750-1000kg of clear water fertilizer and 500g of potassium dihydrogen phosphate should be mixed in the fertilizer. The crack should be filled with soil after irrigation. In order to prevent premature senescence, prolong and enhance photosynthesis of leaves and promote potato hypertrophy, foliar fertilizer should be sprayed. Potassium dihydrogen phosphate 0.5kg per mu, mixed with water 30- 40kg, mixed with 800 times of new lipid membrane solution for foliar spraying, once every 15 days, twice in total.

6, timely lifting

Sweet potato plants everywhere have the habit of turning vines, the reason is that turning vines can control excessive growth of stems and leaves, but a large number of experiments have proved that turning will lead to yield reduction. The reason is that the base leaf is damaged and the leaf area is reduced due to the turning of the vine; the normal distribution of the base leaf is disturbed due to the turning of the vine, and the photosynthetic capacity is reduced; the turning of the vine will cause the axillary bud at the base of the stem to grow new branches, so that more nutrients are distributed in the base leaf part. Therefore, in addition to the combination of broken base pharynx white, soil and other measures for a short time to turn the vine, generally not turn. When raising vines, attention should be paid to reducing stem and leaf damage as much as possible, and putting the stems and vines along the ridge direction is good for continued growth.

7. Timely harvest

When the temperature drops to 15C, it begins to harvest, usually before and after the cold dew.

Second, the nutritional value of purple potato

Purple raised in addition to common red pepper nutrients, but also rich in sun elements and anthocyanins. Selenium is an essential element for anti-fatigue, anti-aging and enriching blood. Especially since he is known as the "King of Cancer". Anthocyanins have preventive and therapeutic effects on more than 100 diseases. Anthocyanins are the most direct, effective and safe free radical scavengers found in the scientific community to prevent and treat diseases and maintain human health. Their ability to scavenge free radicals is 20 times that of vitamin C. 50 times more vitamin E. Anthocyanins have a small molecular structure, which is the only substance that can clear free radicals through the blood-brain barrier and protect brain cells. At the same time, it can reduce the harm caused by antibiotics to human body, so it has high promotion and application value.

Well, the above is the soil drift net to bring you purple potato planting precautions. So I'll see you next time.