草业学报2016，Vol.25Issue(6)：13-25,13.DOI:10.11686/cyxb2015400
施氮水平对甜高粱主要农艺性状及其与干物质产量相关关系的影响
Effects of nitrogen on agronomic traits and dry matter yield and their relationship in sweet sorghum
摘要
Abstract
This study was conducted to determine the relationship between dry matter (DM)yield and agronom-ic traits of sweet sorghum (Sorghum bicolor cv.‘Hunnigreen’)using correlation and path coefficient analysis under different rates of nitrogen (0,100,200,300,400,500 kg N/ha).The experiment was set up in eastern China during 2009-2010 and 7 agronomic traits of sorghum were evaluated.Results showed that DM yield was positively correlated (P <0.01)with plant height (r=0.921 ** ),leaf area index (LAI,r=0.865 ** )and stem diameter (SD,r=0.758 ** ).Plant height and LAI produced the strongest path coefficient (P =0.638,P =0.391)for DM yield.Plant height was the best indicator of DM yield using stepwise regression analysis.The contribution of stem∶leaf ratio (S∶L ratio)and LAI to DM yield differed under different rates of N fertilizer.S∶L ratio and LAI had positive path coefficient (P =0.925,P =0.162)for DM yield under lower N fertilizer rate (0,100 kg N/ha).LAI had a positive path coefficient (P =0.797)for DM yield under intermediate N fer-tilizer rates (200,300 kg N/ha),but had a negative path coefficient for DM yield under higher N fertilizer rates (400,500 kg N/ha).The Effect of S∶L ratio on DM yield decreased with increasing N rate.DM yield was highest at N rates of 200-400 kg N/ha.Plant population was important for higher DM yield at higher rates of N fertilizer.Under lower N fertilizer rates,harvest date was a key issue in terms of the trade-off between DM yield and nutritive value of sweet sorghum.关键词
甜高粱/施氮水平/干物质产量/农艺性状/通径分析Key words
sweet sorghum/nitrogen fertilizer rate/dry matter yield/agronomic traits/path analysis引用本文复制引用
渠晖,程亮,陈俊峰,陆晓燕,沈益新..施氮水平对甜高粱主要农艺性状及其与干物质产量相关关系的影响[J].草业学报,2016,25(6):13-25,13.基金项目
国家科技支撑计划南方优质饲草高效生产加工利用关键技术研究与集成示范项目（2011BAD17B03）资助。 （）
