甘蔗产量构成因素与产量的关系

对32个甘蔗品种或组合的产量构成因素与产量的相关、回归、通径关系和鲜蔗产量估测差异进行分析，结果表明：茎高与有效茎呈极显著正相关；茎高、有效茎与鲜蔗产量呈极显著正相关；除茎径外，其余二性状与产量的偏相关系数为极显著正相关，偏回归系数达极显著水平。茎径、茎高、有效茎对产量的直接通径效应除茎径外，其余均为较高正值，但以茎高最高，有效茎次之。因此，若想得到产量较高的甘蔗品种，固定其余因素，选择植株高大的对提高鲜蔗产量效果较佳；以有效茎为选择指标时，可在茎较高选择鲜蔗产量较高的材料。以茎高、茎径和有效茎计算理论值来估测鲜蔗产量的经验公式（Y＝1896．3107＋0．690DX1^2X2X3),理论上是可行的。

Relation between Yield-related Traits and Yield in sugarcane

Correlation, regression and path between yield related traits and yields on 32 sugarcane varieties and variations of forecasting yield were analyzed. Correlation between stem height and productive stem is significant positive. Correlations between yield and the traits such as stem height and productive stem are significant positive. Partial correlation coefficients between yield and other two traits except stem diameter are significant positive correlation, their partial regression coefficients reach high significant level, and their direct path effects except stem diameter are higher positive value. Selecting stem height can get better results on the condition of fixing other traits in order to develop a high yield sugarcane variety. Selecting productive stem per ha can get better results from higher stem height on the condition of fixing other traits. The regression equations for forecasing yield from stem diameter, stem height and productive stem is feasible in theory.