Effects of Population Density Controlling and Topping on Virus-free Potato Growth

Using cv.Lishu 7 as plant material,the influence on potato growth of artificial control of main stem quantity and topping was studied.The results indicated three stems per hill were optimal for potato yield;topping was beneficial for shaping plant,weakening apical dominance,balancing growth between above ground and under ground growth,and thereby increasing potato tuber yield.