Effects of soil and leaf nutrients in citrus orchard on fruit quality of 'Hongmeiren'
In order to explore the effects of soil and leaf nutrients on fruit quality of'Hongmeiren',the soil,leaf nutrients and fruit quality of 33'Hongmeiren'orchards in Xiangshan county,Ningbo city were measured and evaluated.The main soil and leaf nutrient factors affecting fruit quality were screened by multivariate statistical analysis,and the correlation between fruit quality,soil and leaf nutrients was clarified.The results showed that the soil pH in the investigated orchard was in a slightly acidic environment,the average was 5.41,and the soil nutrients were generally high.Among them,the average contents of available iron,available manganese,available copper,available zinc,available phosphorus,available potassium,exchangeable calcium,exchangeable magnesium,total nitrogen,total phosphorus and total potassium were beyond the suitable range;additionally,the contents of iron,manganese and nitrogen in leaves were also higher than the suitable range,while the contents of potassium and calcium were lower than the suitable range.The fruit quality is the result of the comprehensive effect of multiple soil and leaf nutrient factors.The soluble solid content of fruit was positively correlated with the content of available manganese and effective nitrogen in soil,and the coefficients were 0.55 and 0.45,respectively.Pulp compactness was negatively correlated with the content of available zinc,available phosphorus,total phosphorus and effective nitrogen in soil,and the correlation coefficients were-0.83,-0.79,-0.50 and-0.51,respectively.The acidity of pulp was also correlated with the content of potassium and phosphorus in leaves,and the correlation coefficients were-0.63 and-0.50,respectively.The main soil nutrient factors affecting the contents of nitrogen,phosphorus,magnesium,manganese,copper and zinc in leaves of Hongmeiren were obtained by stepwise regression analysis.Therefore,the pH adjustment of the orchard soil and the increase of physiological alkaline organic fertilizer will be the key to the subsequent orchard soil management.
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