Method for promoting yield increase by earthing, pruning and pinching winter potatoes

The invention belongs to the technical field of potato planting, and discloses a method for promoting yield increase by earthing, pruning and pinching winter potatoes. The method comprises the following steps: replanting and hilling are conducted, and when seedlings grow to 10-15 cm, only one single trunk plant is reserved in each hole, and redundant plants are cut off; hole applied fertilizer mainly containing an N fertilizer is topdressed after the seedlings grow neatly and are pruned; foliar fertilizer is additionally sprayed; when the potatoes grow to 35-40 cm, the top ends of main branches of the potatoes are pinched. According to the method, the foliar fertilizer mainly containing P fertilizer is additionally sprayed, so that more lateral branches are differentiated from remaining trunk plants, the photosynthetic area of the plants is increased, and effective growth of the potatoes is promoted. If buds appear, the flower buds are picked off, the growth height of potato plants iscontrolled, and more nutr