《Table 3 Total copper, zinc and iron contents and accumulations in different organs of cotton plant

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《"Effects of Copper-based Nutritional Foliar Fertilizers on Photosynthetic Characteristics,Yield and Disease Control Efficiency of Cotton"》

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Means in the same vertical column with the same letter are not different significantly at the 5%level in the same year.

Effects of different treatments on total copper contents and accumulations in different organs of cotton plantsThe contents and accumulations of total copper，total zinc and total iron in various organs of cotton plants in different treatments（2014）are listed in Table 3.It could be seen that each treatment had significant effects on total copper contents and accumulations in various organs of cotton plants（the sampling date was September 4，at initial boll opening stage），and the total copper contents in various organs ranked as leaf>stem>cotton boll>root.Among different treatments，the BDM treatment had the highest total copper content，which increased significantly by 160.09%，155.14%，155.34%and 257.19%in the leaf，stem，boll and root，respectively，compared with the CK.The BDM treatment might cause excessive copper absorption in cotton，thereby inhibiting the growth of cotton[22].The total copper content of the CFZn B treatment increased the smallest compared with CK，and the contents in the leaf，boll and root increased significantly by 19.14%，40.33%and 46.67%，respectively，compared with the CK，while the difference in total copper content in the stem from the CK was not significant；and the remaining three treatments had the total copper content in each organ between the above two.The changing trend of total copper accumulation in various organs of cotton plants of different treatments was basically consistent with that of total copper content.