Calcium Regulates Growth and Nutrient Absorption in Poplar Seedlings.

Furthermore, the increase in exogenous calcium content led to a decreasing trend in the C/N ratio in different organs of poplar seedlings.

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poplar growth calcium photosynthetic characteristics stress resistance nutrients absorption Photosynthetic Characteristics of Poplar Seedlings In general, the indicators of photosynthetic characteristics first showed an increasing trend and then a decreasing trend with increasing calcium concentration ( Figure 3 ).

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With the increase in the concentration of Ca, the P, K, and Ca distribution rates of leaves first showed a decreasing trend and then an increasing trend, and roots showed an adverse trend.

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