First, cultivated potatoes should have loose soil, good air permeability, rich organic matter content, flat terrain, close to water sources and convenient irrigation and drainage. Potato continuous cropping is not suitable, because continuous cropping will aggravate soil-borne diseases and insect pests, easily lead to a serious lack of some elements in the soil, destroy the natural balance of soil microorganisms, increase the accumulation of harmful substances secreted by roots, and affect the yield and quality of potatoes.

2. Ditching, the ridge spacing is 50-60 cm, and the ditch depth is 10 cm. Fertilizer is applied in the ditch, and organic fertilizer is applied on the fertilizer. Sow bud blocks on organic fertilizer, and try to isolate the bud blocks from chemical fertilizer.

3. Sow according to the required density of potato varieties, with the spacing between early-maturing varieties of 20 cm and the spacing between middle-maturing varieties of 25 cm. The covering thickness is 6 6- 10/0cm. In the case of moderate soil fertility, it is guaranteed to plant more than 5000 holes per mu.

Fourth, it is best to use balanced fertilization (formula fertilization) for fertilization. According to the law of potato fertilizer application, experiments show that when the tuber yield per mu is 1000 kg, it is necessary to absorb 5.6 kg of nitrogen, 2.2 kg of phosphorus and 0.2 kg of potassium from the soil.

Potatoes need potassium most, followed by nitrogen and less phosphorus. The ratio of nitrogen, phosphorus and potassium is 5:2:9.

1. In the case of good soil fertility and sufficient base fertilizer, topdressing is generally not needed. However, if topdressing is necessary, topdressing can be carried out at the 6-leaf stage. Topdressing too early can't play a role in topdressing, and topdressing too late has a poor effect on increasing production, even greedy for small and cheap, leading to reduced production.

2. The sign of physiological maturity of potato is that most of the stems and leaves turn yellow and wither, and the stem blocks stop expanding and are easy to be separated from the plants. Before reaching physiological maturity, the earlier the harvest, the lower the yield. However, harvesting too late will also increase the chance of insect infection. Potato pieces for storage can be harvested later; Seed potato should be harvested 5-7 days in advance to reduce the accumulation of virus in tuber, so as to obtain physiological young potato.

References:

Baidu encyclopedia-potato