《Table 2 Photosynthetic characteristics of cotton leaves at peak bolling stage under different treat

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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.

Under normal conditions，increases of leaf transpiration rate and stomatal conductance are conducive to gas exchange，and could improve photosynthetic capacity of mesophyll cells，thereby improving leaf photosynthetic rate[20].It could be seen from Table2 that the CFFe，CFZn B，CF and KCD treatments could significantly increase photosynthetic rate，stomatal conductance and transpiration rate of cotton leaves，and the test results in the two years showed basically the same trend.The photosynthesis rates of the CFFe，CFZn B，CF and KCD treatments increased by 26.35%，17.96%，12.17%and 10.57%，respectively in 2013，compared with the CK.Among them，the photosynthesis rate of the CFFe treatment also increased significantly by 12.64%and 14.27%，respectively，compared with the CF and KCD treatments，while that of the BDM treatment was 1.52%lower than CK，without a significant difference.The photosynthesis rates of the CFFe，CFZn B，CF and KCD treatments increased by 25.97%，17.74%，12.03%and 10.45%respectively in 2014，compared with the CK.Among them，the photosynthesis rate of the CFFe treatment also increased significantly by 12.44%and 14.05%compared with the CF and KCD treatments，respectively，while that of the BDM treatment was 1.82%lower than the CK，without a significant difference from the CK.The stomatal conductance of the CFFe，CFZn B，CF，and KCD treatments increased significantly by25.53%，21.28%，19.15%，and 14.89%，respectively in2013，compared with the CK，and only the stomatal conductance of the BDM treatment was 2.13%lower than the CK，without a significant difference.The stomatal conductance of the CFFe，CFZn B，CF and KCD treatments increased significantly by27.45%，23.53%，19.61%，and 15.69%，respectively in2014，compared with the CK，and only the stomatal conductance of the BDM treatment was 1.96%lower than the CK，without a significant difference.The transpiration rates of the CFFe，CFZn B，CF and KCD treatments increased significantly by 22.59%，19.53%，15.16%and 10.64%，respectively in 2013，compared with the CK，but there was no significant difference between any two of them；and only the transpiration rate of the BDM treatment was 4.08%lower than the CK，without a significant difference.The transpiration rates of the CFFe，CFZn B，CF and KCD treatments significantly increased by 23.47%，19.76%，14.99%and 10.74%，respectively in 2014，but there was no significant difference between any two of them；and only the transpiration rate of the BDM treatment was 3.45%lower than the CK，without a significant difference.A high photosynthetic efficiency means that more light and raw materials are needed，and more CO2is consumed.Therefore，intercellular CO2concentration decreases with the photosynthetic efficiency increasing[21].The intercellular CO2concentrations of the CFFe，CFZn B，CF and KCD treatments decreased by 14.54%，12.14%，6.50%and 5.81%，respectively in 2013，compared with the CK，while the BDM treatment had an intercellular CO2concentration 2.63%higher than the CK，without a significant difference.The intercellular CO2concentrations of the CFFe，CFZn B，CF and KCD treatments decreased by 15.39%，13.02%，7.43%and 6.14%，respectively in 2014，compared with the CK，while the BDM treatment had an intercellular CO2concentration 1.60%higher than the CK，without a significant difference.