Abstract:

The purpose is to survey the impact of meteorological factors on the yield of sweet potato in Tongliao and provide a scientific basis for agricultural planting structure adjustment in Tongliao. Based on planting data and meteorological observation of sweet potato extension planting bases, the correlation between meteorological factors and the yield of sweet potato was analyzed. The results showed that accumulated temperature and sunshine duration had obvious correlation with the yield of sweet potato, and the correlation coefficients were 0.741 and 0.837 respectively. The average daily temperature and precipitation had no significant correlation with the yield of sweet potato. Except the rooting-seedling establishment stage, the change features of accumulated temperature of the other development stages were similar with those of the whole development period. The correlation coefficients were all over 0.788. The inter-annual change feature of sunshine duration was consistent with that of the whole development period. Only the potato intamescentia stage had significant correlation with the inter-annual change features of precipitation and the average daily temperature of the whole development period, and the correlation coefficients were 0.933 and 0.936 respectively. Thermal and light conditions had relatively large effects on the yield of sweet potato, and they were the limiting factors for sweet potato planting. The effect of rainfall on sweet potato yield was not obvious.

Key words: Tongliao, sweet potato, production, meteorological factor, sunshine duration, accumulated temperature, precipitation, average temperature