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通过对我国１８个主要枣树品种果核的调查分析表明：核重与果重、果形指数、核壳厚成正相关；核壳厚小于０．４ｍｍ的属软核品种；核形主要受果形的影响，核形指数与果形指数、核壳厚成正相关；核果比主要受含仁率、果重、核形指数的影响；有７个品种含仁率未超过１０％，９个品种具双仁现象，１１个品种有胚退化后残留下的种皮。所谓“无核枣”仍具核，只是核不发达，较小而薄；在实际工作中，宜把鲜核果比小于２％，核壳厚小于０．４ｍｍ，含仁率不超过１０％的品种称无核枣。
Through the investigation and analysis of the fruit kernels of 18 major jujube varieties in China, the results showed that there was a positive correlation between kernel weight and fruit weight, fruit shape index and core-shell thickness. The core-shaped soft core species was less than 0.4 mm, Shape, the karyotype index was positively correlated with the fruit shape index and the nuclear shell thickness. The kiwifruit ratio was mainly affected by kernel rate, fruit weight and karyotype index. There were 7 varieties with no more than 10% kernel rate and 9 varieties A double kernel phenomenon, 11 varieties of embryos after the degradation of the seed coat. The so-called “non-nuclear jujube” is still nuclear, but the nuclear underdeveloped, smaller and thin; in practice, the fresh-fruit ratio should be less than 2%, the core-shell thickness of less than 0.4mm, kernel rate of not more than 10% Variety that nuclear-free dates.