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Effect of Topdressing Potassium Nitrate on Potato Yield

JIAO De-zhi(College of Life Science and Technology,Qiqihar University,Qiqihar,Heilongjiang 161000)  
The experiment in the effect of topdressing potassium nitrate on the potato yield was carried out for two years.The results showed that topdressing potassium nitrate increased the yield and the farina content of stem tubers and also increased the content of blade and chlorophyll during the last period when growing up.Besides,the photosynthesis intensity was increased as well.Different effects on potato yield depended on different periods of topdressing potassium nitrate and topdressing potassium nitrate could produce the best effect in buds producing.
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