Method for increasing output of potatoes

The invention provides a method for increasing the output of potatoes. The method comprises the following steps: a, dividing a test field into small test blocks, adjusting the harvesting stage of each small test block based on an original harvesting stage of the test field, determining 3 to 5 harvesting stages before the original harvesting stage, and determining 1-2 harvesting stages after the original harvesting stage, wherein the interval between the harvesting stages of the small test blocks is 5 to 8 days; b, respectively harvesting potatoes from the small test blocks according to the corresponding harvesting stages, and recording the yields of the potatoes in the small test blocks and the local market selling prices at the harvesting time; c, multiplying the yields of the potato goods harvested from the different small test blocks with the market selling prices to calculate unit area values in the harvesting stages corresponding to the different small test blocks; d, selecting the small test block with