Preliminary Study on Nitrogen Diagnosis in Sugarcane with SPAD
Qiwei Li · Sugarcane and Canesugar · 2012
Testing nitrogen content in leaf is an important diagnostic means for N status of sugarcane.A pot experiment with different application rate of N fertilizer was carried out to evaluate the feasibility of SPAD as a diagnostic tool in sugarcane.Results showed that SPAD values,nitrogen content in leaf and cane yield increased steadily with application rate of nitrogen within a certain amount,then increased slowly or even declined after exceeding a certain level.Results also showed that the SPAD value had a significant positive relationship with nitrogen content in leaf and cane yield,which could be used as a nitrogen deficit indicator and be guidance for nitrogen application in sugarcane.