摘要：Nitrogen-water system is one of the main growth management for flue-cured tobacco. With unhealthy growth under unreasonable nitrogen application and irrigation, a suitable Nitrogen-water treatment availably promote tobacco growth, saving water and fertilizer. In this text, nitrogen treatments for flue-cured tobacco were designed at 4.0, 5.5 and7.0 g per plant. Each N treatment coupled with irrigation treatments at root extending period (50%, 60%), vigorous growth period (70%, 80%, 90%), harvesting period (60%, 70%), of which above ratios were proportion of saturation moisture capacity. Tobacco biological yield, water evaporation were investigated. The results showed that irrigation system with 90%, 70% in last growing period, could obviously enhance tobacco leaves, while the root extending water was 50% or 60%. Water-nitrogen coupling production function was best fitted at full quadratic curve equation (R~2=0.669, P<0.001), which can be to same extend used to direct water and nitrogen system for flue-cured tobacco.
关键词：Evapotranspiration;Water-fertilizer coupling mechanism;Yield production function
