青贮玉米不同部位干物质量对中性洗涤纤维含量的影响

Effects of Proportion of Dry Matter Content in Different Organs on Neutral Detergent Fiber Content in Silage Corn

[目的]了解青贮玉米不同部位间干物质比例对全株中性洗涤纤维(NDF)含量的影响。[方法]利用9个青贮玉米自交系,按完全双列杂交(正交)组配成36个杂交组合,对组配的36个杂交组合的不同部位的NDF含量和干物质量进行统计分析。[结果]青贮玉米不同部位的NDF含量存在显著差异,且不同部位干物质比例对NDF含量均存在显著相关性。秸秆干物质比例、秸秆部位的茎和叶片干物质比例、果穗部位的苞叶和穗轴干物质比例均与全株的NDF含量呈显著正相关,而果穗干物质比例和籽粒干物质比例与全株的NDF含量呈负相关。[结论]降低秸秆的NDF含量和提高籽粒产量是青贮玉米NDF品质改良的有效途径。

[Objective] To investigate the effects of proportion of dry matter of different organs in whole-plant dry matter on neutral detergent fiber（NDF） content in silage corn.[Method] A total of 36 crosses were developed from nine inbred lines,according to complete diallel crossing design.The NDF contents and proportion of dry matter in different organs were statistically analyzed.[Result] The NDF contents were significantly different between different organs of silage corn,and the proportion of dry matter and NDF content had significant correlation in different organs.The whole-plant NDF content was positively correlated with the proportion of dry matter in straw,stem and leaf as well as husk and spike-stalk,but it was negatively correlated with the proportion of dry matter in ear.[Conclusion] To reduce NDF content in straw and to increase grain yield are efficient ways to improve quality of silage corn.