减量施氮间作豆科绿肥压青对甘蔗农艺性状、产量及品质的影响

试验设置N 472.5 kg/hm2（N1）、N 236.3 kg/hm2 （N2）两个施氮水平和甘蔗单作、甘蔗/大豆间作压青、甘蔗/绿豆间作压青三种种植模式，研究减量施氮间作豆科绿肥压青对甘蔗农艺性状、产量及品质的影响。结果表明：在土壤氮水平较高的条件下，减量施氮对甘蔗生长及产量没有影响，相反，氮肥减量处理甘蔗平均产量比常规施氮量处理增产13590 kg/hm2 。氮肥减量可提高甘蔗蔗糖分含量，氮肥减量处理平均蔗糖分含量比常规施氮量处理提高1.02个百分点。甘蔗间作绿豆压青可促进甘蔗生长，甘蔗产量比甘蔗单作增产10.27 %，而甘蔗间作大豆压青对甘蔗生长有一定影响，甘蔗产量比甘蔗单作甘蔗减产1.45 %。甘蔗间作豆科绿肥压青有利于甘蔗蔗糖分积累，间作绿豆压青比甘蔗单作蔗糖分含量提高0.89个百分点，间作大豆压青比甘蔗单作蔗糖分含量提高0.59个百分点。综合甘蔗农艺性状、产量、甘蔗蔗糖分含量、经济效益等方面分析，本研究以甘蔗/绿豆-N2处理最优。

Effects of Reduced Nitrogen Fertilization and Intercropping Legume Ruturning as Green Manure on Sugarcane Agronomic Characters, Yield and Quality

Two nitrogen application levels ( N 472.5kg/hm2, N 236.3kg/hm2) and three planting patterns (sugarcane monoculture, sugarcane/soybean intercropping and sugarcane /mung bean intercropping )were set to study the effects of reduced nitrogen fertilization and intercropping legulaborme ruturning as green manure on sugarcane agronomic characters, yield and quality. The results showed that under the condition of high soil nitrogen level, the reduced nitrogen application had no effect on sugarcane growth and yield. On the contrary, the average sugarcane yield increased by13590 kg/hm2 under the reduced nitrogen application compared with the conventional nitrogen application. Nitrogen reduction could increase sucrose content of sugarcane, and the average sucrose content of nitrogen reduction treatment was 1.02 percentage points higher than that of conventional nitrogen application treatment. Sugarcane/mung bean intercropping can promote sugarcane growth, sugarcane yield increased 10.27% than that of sugarcane monoculture, while sugarcane/soybean intercropping has a certain effect on sugarcane growth, sugarcane yield decreased 1.45% than that of sugarcane monoculture. Intercropping legume ruturning as green manure was conducive to sucrose accumulatio.The sucrose content of sugarcane/mung bean intercropping was increased 0.89 percentage points than that of sugarcane monoculture. The sucrose content of sugarcane/soybean intercropping was increased 0.59 percentage points than that of sugarcane monoculture. Based on the analysis of sugarcane agronomic traits, yield, sucrose content and economic benefits, sugarcane/mung bean-N2 was the best treatment.