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甘蔗主要经济性状属数量遗传，受环境影响大，很难区分遗传的变异和不遗传的变异。在杂交后代的早期阶段，即新植实生苗世代、宿根实生苗世代和入选单系作为无性系的最初二代，其性状疯狂分离；与入选时的新植实生苗相比，主要经济性状差异很大，且似乎杂乱无章，没有什么规律，很难用量化的指标进行表述和预测，这给甘蔗育种早期阶段的田间选择造成很大困难。如果为了不遗漏优良材料而大大放宽早期田间选择标准，显然是不经济的，也难以实施。为了确定简便易行而又较明确可靠的早期田间选择方法和标准，有必要对甘蔗杂交后代主要经济性状的分离变化规律不断进行研究和探讨。
The main economic traits of sugarcane are genetically inherited, influenced by the environment, it is difficult to distinguish between genetic variation and non-genetic variation. In the early stage of hybrid progeny, ie, the new planting seedlings generation, the generation of perennial seedlings and the selected single-line as the first two generations of clones, their characters were wildly separated; compared with the newly planted seedlings at the time of selection, the main economic traits Large and seemingly disorganized, without any rules, it is difficult to quantify the indicators for expression and prediction, which makes it very difficult for early field selection of sugarcane breeding field selection. It would be obviously uneconomical and hard to implement if we greatly relax the early field selection criteria in order not to miss out on good materials. In order to determine the method and standard of early field selection which is simple, easy and reliable, it is necessary to study and discuss the regularity of the separation and variation of the main economic traits of the sugarcane crosses.