玉米不同茎节消化性指标与全茎叶干物分解率相关性分析

The Relativity Analysis Between the Digestive Index in Different Stem Nodes and Dry Matter Decomposability Rate of Whole Plant in Corn

对不同玉米品种茎节消化性状进行了分析，从不同茎节茎、叶、茎叶的干物分解率和糖分含量与全茎叶干物分解率的相关性看，雌穗着生节向上和向下2～3节位的茎、茎叶与全茎叶干物分解率呈高度相关，不同节位叶的干物分解率、糖分含量与全茎叶干物分解率之问相关较低或无相关性。以此为依据，可用速效测糖仪测定雌穗节附近茎或茎叶的糖分含量，或测定此部分的干物分解率，进而推测全茎叶的干物分解率，在消化性状选育上达到简便、快速、经济、有效的选择目的。

Maize varieties with different digestive rate were analyzed, and it was proved that the dry matter decomposability rate of the stem and leaf in 2^nd and 3^rd node above the ear were markedly correlated to the dry matter decomposability rate of the whole plant, whereas less or no correlation between the dry matter decomposability rate and the carbohydrate content of different nodes to that of the whole plant was found. Based on the result, a brief and economical method was proposed to test the carbohydrate of the stem or leaf nearby the ear with the saccharimeter, or to examine the decomposability rate of the dry matter of this part, instead of the test of the dry matter decomposability rate of the whole plant.