烤烟营养器官对氮肥的吸收利用效率

Study on Efficiency of Nitrogen Fertilizer Utilization in Flue-cured Tobacco

采用田间小区试验,在磷钾施肥水平相同的情况下,研究了在不同氮肥用量下烤烟根、茎、叶对氮肥的吸收利用率。结果表明,高氮处理对烤烟地上部分干物质积累量影响较大,低氮处理影响较小。氮处理烤烟根系干物质累积总量显著大于对照。烤烟地上部分对氮肥的利用率移栽后20 d<40 d<60 d,移栽后20、40 d氮肥利用率与施氮量呈指数函数型高度相关,移栽后60 d呈二次曲线型中度相关。根系对氮肥的利用率移栽后20 d<40 d<60 d<80 d<100 d,移栽后20 d根系对氮肥的利用率与施氮量呈三次曲线型高度相关,移栽后40 d呈二次曲线型高度相关,移栽后60、100 d呈指数函数型高度相关,移栽后80 d呈指数函数型中度相关。

The fertilizer utilization rates if different amount of nitrogen on the root,stem and leaf of flue-cured tobacco were studied by a field experiment on the same level of phosphons and potassium fertiiization.The results showed that the effect of high nitrogen treatment on the dry matter of aboveground part was bigger than the low nitrgen treatment.The effect of nitrogn treatment on the dry matter accumulation oftobacco root was more than control.The nitrogen fertilizer utiliastion rate of the aboveground part was 20 d ＜40 d ＜60 d after transplanting,and the correlation between the utilization rate of nitrogen fertilizer and nitrogen application was the exponential function type with highly significant correlation for 20,40 d after transplanting,but it was two times curve type moderate corydon for 60 d after transplanting.The fertilizer utilization rate of root was 20 d ＜ 40 d ＜60 d ＜80 d ＜ 100 d after transplanting,and the correlation between the utilization rate of nitrogen fertilizer and nitrogen application was three times curve type with highly significant correlation for 20 d after transplanting,and it wastwo times curve type with highly correlation for 40 d after transplanting,and it was the exponential function type with highly significant correlation for 60,100 d after transplanting,and it was the exponential function type moderate relevant for 80 d after transplanting.