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| Effects of Potassium Phosphite on Potato Yield Increase and Disease Resistance |
| LI Baoyu1，LIU Fuqiang2，GUO Yanzhi1* |
| 1Institute of Food and Nutrition Developmet，Ministry of Agriculture and Rural Affairs，Beijing 100081，China；2Propagation Center of Seed Potato，Inner Mongolia Autonomous Region，Hohhot 010010，Inner Mongolia，China |
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Abstract This paper conducted comparative tests on yield increase and disease resistance effect by applying potassium phosphite（KPhi）and potassium dihydrogen phosphate（CK1）and urea control（CK2），potassium phosphite and the other fungicides on potatoes．The results showed that comparing with the treatment of applying potassium dihydrogen phosphate and urea control，KPhi could promote the growth and development of potato．Its growth period was prolonged by 2 d and 3 d，respectively．The plant height，stem diameter，single plant tuberization number and fresh root weight，etc．had increased significantly．The potato yield per 667 m2 increased by 15.37% and 15.37%，respectively．By applying KPhi，the disease indexes of potato early blight and late blight decreased remarkably，and the rate of rotten potato storaged for 9 months was only 0.50%． To sum up, potassium phosphite had certain effects on increasing potato yield and strengthening its disease resistance．
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