Technical points of Potato cultivation in Autumn

The sowing season is too early, the temperature is high, the seedlings are only long and weak; if the sowing is too late, the growth period is shortened and the yield is low due to the limitation of frost period. Therefore, it is appropriate for Hunan to sow seeds from mid-August to early September.

Varieties with high temperature and drought tolerance, early tuber setting, fast tuber expansion, high yield, good marketability, insensitive to light and short dormancy period were selected. The early-maturing varieties are Feiritar and Dongnong 303, and the mid-late-maturing varieties are Atlantic, Kexin 4 and so on.

Seed potato treatment in the first ten days of July, a single whole potato weighing 30 to 40 grams, free from disease, insect injury and mechanical damage, was put into gibberellin solution with a concentration of 200 mg / L, soaked for 30 minutes, removed and spread out in a cool place with a thickness of not more than 15 centimeters. covered with wet sand or wet grass, the whole bud could be produced in 10 days.

Sowing method seed potato cut into pieces sowing is easy to rot, serious will cause no harvest, so we should choose after treatment, the potato bud more than 0.2 cm of a single small whole potato sowing, potato bud upward. Advocate shallow trench shallow sowing, high ridge, covering soil more than 8 cm. Generally, the plant spacing is 50 × 25 cm per 667m2 with 5 000 × 5 500 holes. Shade cover after broadcast.

The application of sufficient basic fertilizer is generally about 1500 kg of rotten cooked livestock fertilizer, 30kg of phosphate fertilizer, 150kg of plant ash or 50kg of 45% potassium sulfate compound fertilizer or 50kg of special compound fertilizer per 667m2. After ditching strip application, cover the soil, pay attention to fertilizer isolation.

Disease control when potato seedlings are 10-15 cm, respectively, use any one of Leaf Disease Qing, popular, virus A, Gacarate or Zongmike spray to control virus diseases and tea yellow mites. The prevention and control of late blight can be sprayed with 600 times of 25% Ruidu manganese zinc or 72% Kelu 700 times of 800 times.

Topdressing drought resistance depends on the soil moisture and seedling conditions of watering or immersion irrigation, keep moist, watering can cooperate with topdressing. In case of rain or watering, ploughing and weeding in time, look at seedling topdressing and soil cultivation, in general, urea 15-20 kg per 667m2, prosperous seedlings can be less or no topdressing. For excessive fertilizer and water, 0.1% dwarf solution or 50% 100 mg / L paclobutrazol solution can be sprayed.