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图们江下游地区５～９月份历年最高积温为２８３１．６℃，历年最低积温为２４８６．０℃，历年平均积温为２６１７．４℃，适合于种植中熟、中早熟、早熟作物．积温的大小影响粮豆产量，其相关性显著．据分析，历年水稻产量与积温的相关系数Ｒ＝０．９１，不同地区不同积温的相关系数Ｒ＝０．７３．历年旱田作物的平均产量与积温的相关系数Ｒ（玉米）＝０．８０，Ｒ（大豆）＝０．９３．因此在土地适宜性评价中积温作为参评因素是合理的，而且用积温预报估计该年的粮豆产量是可行的
The highest accumulated temperature of the lower reaches of the Tumen River from May to September was 2831.6 ℃ and the lowest accumulated temperature was 2486.0 ℃ over the years. The average accumulated temperature over the years was 2617.4 ℃, which is suitable for planting medium-ripening, middle-early-maturing and early-maturing crops. The effect of accumulated temperature on grain yield was significant. According to the analysis, the correlation coefficient of rice yield and accumulated temperature over the years is R = 0.91, and the correlation coefficient of different accumulated temperature is 0.73. The correlation coefficients between average yield and accumulated temperature of dryland crops in past years were R (corn) = 0.80 and R (soybean) = 0.93. Therefore, in the land suitability assessment, it is reasonable to take the accumulated temperature as the parameter of assessment, and it is feasible to estimate the grain yield of that year by using the accumulated temperature forecast