The purpose was to select main ecological factors and agronomic traits affecting seed yield of tartary buckwheat, differences of seed yield among eight tartary buckwheat varieties in 18 different locations were tested and their relations of seed yield with main ecological factors and agronomic traits were studied by using correlation and path analysis. The results showed that there were significant variation of seed yield among different varieties and among different locations. The widest variation was observed for grain weight per plant (c.v. = 94.2 % ) and following by grains per plant (c.v. = 92.4 % ). Seed yield was significantly correlated to plant height (r = 0.336 * * ) , primary stalk pitch number (r=0.334* * ), grain numbers per plant (r =0.277** ) , grain weight per plant (r =0.259* * ) , whole growth period (r= -0. 392 * * ) , primary branch number ( r = 0. 190 * ). Partial correlation analysis showed that seed yield was much significantly correlated to whole growth period (r = - 0.646 * * ), plant height ( r = 0.591 * * ) and elevation ( r = 0.304 * * ). The path analysis showed that elevation , whole growth period, plant height and mean temperature in the growth period were the important factors influencing seed yield, and latitude, 1000-grain weight, and primary stalk pitch number were the secondary factors of tartary buckwheat, in addition, the suitable primary branch number, grain weight per plant should be paid attention to.%为筛选影响苦荞产量的主要生态因子和农艺性状,调查了8个苦荞品种在全国18个不同地区的产量差异,并对产量和主要生态因子与农艺性状进行相关性和通径分析.方差分析表明,苦荞种子产量差异在品种之间、地点之间分别达显著和极显著水平.苦荞品种单株粒重和单株粒数的变异系数最大,分别为94.2％和92.4％.简单相关分析表明,产量与株高、主茎节数、单株粒数、单株粒重、全生育期、主茎分枝数呈(极)显著相关,相关系数分别为0.336**、0.334**、0.277**、0.259**、-0.392**、0.190*.偏相关分析表明,苦荞产量与全生育期、株高、海拔的偏相关达极显著水平,偏相关系数为-0.646**、0.591**、0.304**.通径分析表明,海拔、全生育期、株高、生育期均温是苦荞高产的最重要影响因素,纬度、千粒重、主茎节数为高产次要因素.此外,也要适当兼顾主茎分枝数、单株粒数、单株粒重.
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