施氮量和密度互作对全覆膜旱作甜菜光合特性和块根产量的影响

闫威,李国龙,李智,曹阳,张少英

Effects of Nitrogen Application Rate and Planting Density Interaction on Photosynthetic Characteristics and Root Yield of Sugar Beet under Full-Film Mulching in Arid Regions

Wei Yan,Guolong Li,Zhi Li,Yang Cao,Shaoying Zhang

表7 全覆膜旱作甜菜施氮量（N2）和密度(D2)与光合指标和物质积累与分配的相关性（块根糖分增长期）

Table 7 Correlation between nitrogen application rate (N2) and planting densities (D2), and photosynthetic indexes and accumulation and distribution of matter of sugar beet under full-film mulching in arid regions (the sugar increasing stage of root)

处理 Treatment	叶面积指数 LAI	SPAD值 SPAD value	P_n	单株干物质积累量 Dry matter accumulation per plant	根冠比 Root/Shoot ratio	产量 Yield
密度Planting density	0.935^**	-0.995^**	-0.990^**	-0.996^**	-0.954^**	0.629^*
施氮量Nitrogen application rate	0.893^**	0.324	0.361	0.667^**	0.532^*	0.678^*