猕猴桃果实单果重、果实大小是分级的主要指标。为了科学合理地量化分级指标，以陕西主产的秦美猕猴桃为研究对象，选取果实单果重、果实长轴、果实短轴3个指标，研究了不同指标的分级区间和关系。首先，对3个指标信息统计分析，依据秦美猕猴桃实际收购区间和优质果实区间，划分出正常果实长短轴区间、优质果实长短轴区间，并统计各区间样本比例；然后，以果实长轴、果实短轴为果实大小单一指标，果实矩形面积、椭圆面积为复合果形指标，进行了果实大小单一指标、复合果形指标与果实单果重之间的关联性研究。结果表明，秦美猕猴桃果实单果重、果实长轴、果实短轴的数据服从正态分布，划分了合理的分级区间；果实大小单一指标、复合果形指标与单果重的线性关系明显，果实单果重与果实长、短轴之间函数拟合系数为0．71和0．80，单果重与面积的函数拟合系数为0．92。以上结果为猕猴桃果实果形指标量化提供了方法和理论依据。%The fruit grading is an important part to improve the additional value of fruit and ensure quality in postharvest . The indexes of kiwifruit grading mainly are fruit shape , single fruit weight and fruit size etc .The fruit shape is usually distinguished by long axis .In this paper , single fruit weight , fruit long and short diameters of grading indexes were se-lected to study .First of all , the single fruit weight , fruit long and short diameters of Qinmei fruit was analyzed , and car-ried out the commodity range and the high quality fruit range .Also , the fruit long and short diameters range of normal fruit and high-quality fruit were confirmed , and the sample proportion of each range was analyzed .Then , the correlation of the single fruit weight and fruit size was studied .The results show that the data of single fruit weight , fruit long and short diameters obey the normal distribution .The linear relation between Qinmei fruit shape index or the composite index and the weight is clearly .The quadratic fitting coefficient of relation between the single fruit weight and long -short axis was 0 .71 and 0 .80 separately , the quadratic fitting coefficient of relation between the single fruit weight and the image area was only 0.92.The results provide methods and theoretical basis to quantify the fruit shape index .
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