密度与氮肥配合对垄沟覆膜栽培冬小麦干物质累积及产量的影响

为协调冬小麦个-群体间关系，建立适宜的群体结构，充分发挥旱作条件下垄沟栽培优势，以小偃22为材料，采用二元二次旋转组合设计，通过2年田间试验研究了垄沟覆膜、垄下集中施肥模式下种植密度与施氮量对冬小麦个-群体间干物质累积及产量的影响。结果表明，个体干物质累积量随种植密度的增加呈降低趋势。2008～2009年群体干物质累积量随种植密度的增加而减小；2009～2010年群体干物质累积量随种植密度的增加而增加。花期单茎干物质累积量不受施氮量的影响；而成熟期个体干物质累积量随施氮量的增加而增加。冬小麦群体干物质累积量均随施氮量的增加而增加。冬小麦能够通过分蘖调节自身的群体结构，不能盲目的通过增加播种量增加小麦群体密度；适量的增施氮肥有利于个体与群体发育。本试验条件下，冬小麦品种小偃22在中等密度（112 kg/hm2）与较高施氮量（N 201～214 kg/hm2）配置时，个群体关系比较协调，个体发育健壮，群体干物质累积量和产量较高。

Effects of sowing density and N rate on biomass accumulation and yield of winter wheat in furrow and ridge film mulching

The aim of this study was to harmonize the relationship between individual and population,and establish a suitable community structure,and fully apply the advantages of furrow and ridge cultivation in rainfed land areas.The successive two year field experiments were conducted to investigate the effects of sowing density and N rate on yield,and dry matter accumulation of individual and population of winter wheat in the furrow and ridge film mulching planting system.The central composite rotatable design with...