A pot experiment was carried out to compare the photosynthesis and chlorophyll fluorescence of four winter wheat varieties.The experiment also included three sowing ways and four fertilizer treatments.The results showed that:(1) The highest SPAD was obtained at flowering and filling stage with NP treatments,and there were significant differences among different fertilization treatments.Comparing to no nitrogen treatment,SPAD increased 17.83% and 13.01% with NP treatments at flowing and filling stage,respect...
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