追施普通尿素与控释尿素对玉米后期穗部叶片光谱特征的影响

Effects of Common Urea and Controlled-release Urea for Topdressing on Spectral Characteristics of Ear Leaves in Late Growth Stage of Maize

为指导玉米科学追肥,在玉米大喇叭口期分别追施普通尿素和控释尿素,通过玉米穗部叶片光谱特征比较两种施肥处理与对照的施肥效果。结果表明:在310~700 nm波段,两个测量时期吉单27玉米叶片光谱反射率趋势基本一致,在550 nm出现绿峰;在700~1130 nm波段,两个测量时期均出现波状起伏状态的反射率较高的平台。在玉米大喇叭口期后30 d叶片光谱反射率处理中,叶片光谱700~1130 nm波段,普通尿素处理叶片光谱的反射率高于其他两个处理,在玉米大喇叭口期后60 d叶片光谱反射率处理中,叶片光谱700~1130 nm波段,控释尿素处理叶片光谱反射率高于普通尿素处理,普通尿素处理叶片光谱反射率高于对照。综上所述,玉米大喇叭口期追肥,可以追施普通尿素为主,适量增加少量控释尿素缓解玉米后期早衰。

In order to guide the scientific topdressing of maize,common urea and controlled-release urea were applied respectively in the big bell stage of maize,and the fertilization effects of two fertilization treatments and control were compared through the spectrum characteristics of maize ear leaves.The results showed that the spectral reflectance trend of Jidun 27 maize leaves was basically the same in the band of 310-700 nm,and the green peak appeared at 550 nm.In 700-1130 nm,two measurement periods in the state of the wave ups and downs of high reflectivity platform,30 days after huge bellbottom period of maize leaf spectral reflectance in processing,spectral blade 700-1130 nm,common urea process leaf spectral reflectance were was higher than the other two,in the maize big trumpet period after 60 days leaf spectral reflectance in processing,spectral blade 700-1130 nm,controlled-release urea treatment leaf spectral reflectance was higher than the common urea,common urea treatment leaf spectral reflectance was higher than control.To sum up,top dressing of maize in the big trumpet-opening stage should not apply controlled release urea completely,but apply common urea mainly,and a small amount of controlled-release urea should be added appropriately to alleviate premature senescence of maize.