During the entire vegetative period, the amount of chlorophyll a was higher than that of chlorophyll b , and an increasing trend in the chlorophyll a / b ratio was also observed ( Table 2 ).
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Effect of Phenological Stage and Leaf Age on Changes of Chlorophyll and Carotenoid Contents in Some Weeds and Invasive Species.
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The sentences
Later, the content of these pigments maintained a decreasing trend and reached the lowest content (almost 6 times lower than at the beginning of vegetation) at the beginning of September.