《Table 5 Enzyme activity of soil under different treatments in 2014》

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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.

Soil enzymes are an important constituent of soil.They are biocatalysts that produce specific biochemical reactions in soil，participate in various biochemical processes in soil and play an important role in soil development and soil fertility formation[25].Copper preparations，that have not been absorbed by leaf surface，have a significant effect on soil enzyme activity.It could be seen from Table 5 that there were no significant differences in urease activity between different treatments（except the BDM treatment）.The urease activity of the CFFe，CFZn B，CF and KCD treatments showed a non-significant increase compared with the CK，but the CFFe，CFZn B，CF，KCD and CK treatments were all significantly higher than the BDM treatment in urease activity.The CFFe and CFZn B treatments had the highest urease activity，which was 7.14%higher than the CK.The urease activity of the BDM treatment was significantly lower than that of the CK，which meant that it inhibited urease activity，while the CFFe，CFZn B，CF and KCD treatments slightly activated soil urease activity.There were no significant differences in soil catalase activity between the CFFe，CFZn B，CF and KCD treatments，which also had no significant differences from the CK，but the catalase activity in these five treatments was significantly higher than that in the BDM treatment，which inhibited soil catalase activity.The sucrase activity in various treatments significantly increased compared with the CK.Studies[26]have shown that different soil enzymes are correlated with copper concentration to different degrees（sucrase>urease>catalase）.At a low copper concentration，copper has an activating effect on the three kinds of enzymes，while at a high copper concentration，it has an inhibiting effect on the three enzymes[26].In this study，the several applied copper preparations have a relatively low copper concentration，and the activating effect on sucrase was the highest at low copper concentrations as sucrase was most correlated with copper concentration；and the measurement of soil enzymes was performed in the period when cotton grew vigorously（flowering and boll-forming stage），which was also the peak period of soil sucrase activity，the activating effect on which was also higher，while the peak period of soil catalase activity was before the flowering and boll-forming stage[27].Among the different treatments，the soil sucrase activity of the CFFe，CFZn B，CF and KCD treatments also significantly increased by 9.87%，7.90%，8.38%and 7.53%，respectively，compared with the BDM treatment.