Abstract: Based on the meteorological and potato growth data in the temperate and cool semi-humid regions of the Northwest China,the relationships between potato growth and meteorological conditions were analyzed by agro-meteorological statistical method.The results showed that the potato growth from the sowing to harvest required 150～168 days,The requirements for the accumulated temperature above 0℃ were about 2000～2300℃,for the precipitation were about 400～500mm,and for the sunshine duration were about 900～1100 hours.The velocity of the potato tuber growth turned to higher velocity at 105 days after sowing,while it reached peak at 127 days after sowing.Then the potato tuber growth turned to a slower period at 149 days after sowing.The influence of the temperature on the formation of potato yields in the growing period was negative except in harvest period.During the tuber expansion period the potato was sensitive to the temperature.The effects of the precipitation on the formation of potato yields were positive except in emergence of seedling and harvest period.The sensitive period of the potato to the precipitation was in the bifurcation-unfold period.

Key words: Potato, Potato, Tuber formation, Temperate and cool semi-humid regions of Northwest China