I want to know what are the critical values of chlorophyll content of major 2 cereals and one important vegetable crop. This critical values will be used as reference point for top dressing of urea in split doses. I am using SPAD 500 manufactured by Konica Minolta, Japan. I want to know the exact time of taking SPAD reading also.
Please check the following link and PDF attachment.
https://www.researchgate.net/publication/255908803_Chapter_Six_Productivity_and_Sustainability_of_the_Rice-Wheat_Cropping_System_in_the_Indo-Gangetic_Plains_of_the_Indian_subcontinent
Article Chapter Six. Productivity and Sustainability of the Rice–Whe...
Be careful because using this type of measure can lead to over application of N and the attendant environmental damage
Leaf chlorophyll content (SPAD) may vary based on crop types and management practices. The threshold can be determined for each crop type through repeated measurements over time. Would you please read this paper for rice?
Mahajan et al. 2014. Development of Critical Values for the Leaf Color Chart, SPAD and Fieldscout CM 1000 for Fixed Time Adjustable Nitrogen Management in Aromatic Hybrid Rice (Oryza sativa L.). Communications in Soil Science and Plant Analysis 45(14):1877–1893
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