Abstract
The Correlation of Leaf SPAD Value at Different Part of Blade with Nitrogen Nutrient Status in Sugarbeet
Highlights
IntroductionHand-held SPAD-502 chlorophyll meter (Soil PlantAnalysis Development) (Minolta Co. Ltd., 1989) relies on LED of dual wavelength (650 nm red light and 940 nm near - IR light) as its light source
Hand-held SPAD-502 chlorophyll meter (Soil PlantAnalysis Development)
The results showed that the relationship between SPAD value of leaf and total chlorophyll content of plant in different developmental stages was very significant correlation
Summary
Hand-held SPAD-502 chlorophyll meter (Soil PlantAnalysis Development) (Minolta Co. Ltd., 1989) relies on LED of dual wavelength (650 nm red light and 940 nm near - IR light) as its light source. The SPAD value (Li et al, 2006) acquired by SPAD-502 chlorophyll meter, is obtained by difference of the ratio of two light densities between samples for testing and without sample. Based on the SPAD value, nitrogen diagnosis and nitrogen fertilizer recommendation were estimated. It’s difficult to detect or watch in real-time the nitrogen nutrition status in different growth stages of crop. As the rapid way to test the leaf’s chlorophyll concentration of plant, the SPAD-502 chlorophyll meter has many advantages (Markwell et al, 1995; Chen and Lu, 1996; Jia et al, 2001; Tiancheng et al, 2000), such as easy to carry and operate, undamaged and real-time to detect and estimate crop chlorophyll status and nitrogen fertilizer recommendation, etc. The SPAD-502 chlorophyll meter are growing concerned and adopted by many researchers and they have already studied in Triticum aestivuml (Zhu et al, 2005; Arregui et al, 2006; Hao et al, 2010; Wu et al, 2012), Corresponding Author: Zhou Jianchao, Academy of Crop Science, Heilongjiang University, Harbin 150080, China
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