Effects of Different Treatments on Yellowing of ‘Qiuyue’ Pear

The etiolated ‘Qiuyue’ pear tree was used as the experimental material, and three etiolation treatments were used to observe the changes of leaf color after treatment, and analyze the changes of mineral elements content in fruit, soil and leaves, in order to screen out the best etiolation treatment plan.The results showed that the treatments of ‘Biyi iron + microcrystalline C’ and ‘freeilene + algin’ showed good effects on reducing yellowing and the leaves turned green obviously 10 days later,but the treatment of soil conditioner had no effect.The contents of soluble solids and soluble sugar treated with‘Biyi iron + microcrystalline C’and ‘freeilene + algin’was significantly higher than that of‘soil conditioner’.The treatment of‘Biyi iron + microcrystalline C’and‘freeilene+ algin’could improve the contents of some mineral element in soil in a certain extent,especially‘freeilene+algin’treatment could improve the content of effective iron in soil significantly.Correlation analysis results showed that,the content of available iron in soil was significantly positively correlated with the content of nitrogen and available manganese.