Topdressing time for potatoes, which fertilizer is better?

Seedling stage: generally combined with ploughing and soil cultivation, 20-10-20+TE water-soluble fertilizer per mu is used for watering. After flowering: potassium fertilizer can be increased in the southern soil lack of potassium, and phosphorus fertilizer can be increased in the northern soil lack of phosphorus. Late growth: spraying sugar alcohol in trace elements such as boron, copper and so on.

Topdressing time of potatoes

1. Seedling stage

Topdressing nitrogen fertilizer is needed in potato seedling stage, which can be combined with ploughing and soil cultivation. 20-10-20+TE water soluble fertilizer per mu is used to protect potato seedlings. The traditional method is to apply urea to roots, but it is not conducive to plant absorption.

2. After flowering

The main results are as follows: (1) it is necessary to apply high potassium fertilizer after flowering. Potassium fertilizer can be applied in the land where potassium is deficient in the south, and phosphorus fertilizer can be increased in the land where the soil is deficient in the north.

(2) however, potato has a large demand for potassium, which should also be paid attention to. 15-15-30+TE can be applied at the beginning of tuber growth, once every 15 days or so, which is beneficial to promote tuber expansion.

3. Late growth stage

The main results are as follows: (1) in the later stage of potato growth, if there is a phenomenon of element deficiency, foliar topdressing can be carried out, and the trace elements boron and copper in sugar alcohol are generally sprayed, in which boron is beneficial to the hypertrophy of potato lumps and can prevent cracking. It plays a special role in improving the net photosynthetic productivity of the plant.

(2) Copper can increase protein content, increase plant respiration, increase chlorophyll content, delay leaf senescence and enhance drought resistance.

II. Classification of potato varieties

1. Colored potatoes include purple, red, black, yellow, seven colors, etc. China has cultivated purple and red-based color high-quality potatoes, and hybridized old purple and red potato varieties with excellent high-yield potato varieties. more than 100 different strains of colored potatoes were improved and screened.

2. Compared with the old varieties, the improved color potato has smaller bud eyes, good appearance and strong disease resistance, and the yield can reach 1000-1500kg per mu.

3. Colored potato can also be developed as a characteristic food, because colored potato itself contains antioxidants, so after high temperature deep frying, colored potato chips can still maintain their natural color. In addition, purple potatoes are insensitive to light. Deep-fried potato chips can keep the original color for a long time.

4. Black potato is black and purple because it contains a lot of anthocyanins, and anthocyanins have anti-aging effect, but also have the characteristics of developed main stalk, few branches, strong growth potential and strong disease resistance. The yield per mu can reach 1500kg, which is about 20% higher than that of ordinary potato varieties.

5. At the same time, due to the improvement of disease resistance of black potato varieties, the dosage of pesticides is greatly reduced in production, which is conducive to the production of pollution-free and pollution-free green food.