马铃薯氮素营养状况的SPAD仪诊断  

Diagnosis of Potato Nitrogen Nutrition Status by Use of Chlorophyll Meter SPAD-502

作　　者：聂向荣[1] 樊明寿[1] 

机构地区：[1]内蒙古农业大学农学院,内蒙古呼和浩特010019

出　　处：《中国马铃薯》2009年第4期203-207,共5页Chinese Potato Journal

基　　金：科技部十一五科技支撑计划(2008BADA4B02);农业部公益性行业计划项目(200803030)资助

摘　　要：以马铃薯品种克新1号为材料,研究了叶片SPAD值、叶片全氮含量、叶绿素含量以及块茎产量随供氮水平的变化规律及相互关系,旨在为使用叶绿素仪进行马铃薯无损伤氮素诊断和推荐施肥奠定基础。研究结果表明,从马铃薯苗期到块茎淀粉积累各个生育阶段叶片的SPAD测定值均与马铃薯叶片含氮量呈显著正相关关系。除苗期外,块茎形成期、块茎膨大期、淀粉积累期的马铃薯叶片含氮量和叶片SPAD值随土壤施氮量的变化均表现为线形加平台的模式。因此马铃薯块茎形成期后叶片的SPAD读数可揭示马铃薯的氮素营养状况。统计分析结果还表明,叶片SPAD值与块茎相对产量呈线形加平台的数量关系模式,据此确定了应用叶绿素仪SPAD-502进行马铃薯推荐施肥的SPAD临界值为块茎形成期47.3、块茎膨大期45.1、淀粉积累期40.2。The change of potato leaf SPAD value, leaf nitrogen concentration, leaf chlorophyll concentration and potato tuber yield with nitrogen supply was studied in Hohhot by conducting field experiment with the potato variety of Kexin 1. The results showed that leaf SPAD value positively correlated with leaf nitrogen content significantly at potato different growth stages. At tuber initiation stage, tuber bulking stage and tuber starch accumulation stage, both leaf SPAD values and leaf nitrogen contents varied with nitrogen fertilization levels in linear-plateau regression modes, therefore SPAD value could be a good indicator of potato nitrogen nutrition status. Further analysis also showed that relative tuber yield and leaf SPAD correlated in linear-plateau mode, and from the regression mode, threshold SPAD values for the different growth stages of potato were obtained, which are critical for the instruction of nitrogen fertilization in potato by SPAD-502.

关 键 词：马铃薯 SPAD值 氮素营养诊断 

分 类 号：S532[农业科学—作物学]