Investigation and analysis on nutrient status of soil and leaves in ‘Nanguoli’ pear orchards in Liaoning province

【Objective】The soil nutrient status of ‘Nanguoli’(Pyrus ussuriensis Maxim.)pear orchards in Liaoning was investigated for providing the theoretical basis for reasonable fertilization.【Methods】 Soil and leaf mineral nutrient status in 30 typical Nanguoli orchards in Liaoning Province were tested.The problems of soil nutrient were analyzed according to the soil nutrient grading criteria.【Results】The results showed that: the concentrations of N,P,K in leaves were proper in 66.7%-80.0% of the orchards and were low in 10.0%-20.0% of the orchards.N content was high in 23.33% of the orchards.Ca,Mg,Fe,B,Zn and Cu in leaves were suitable in 50.0%-100% of the orchards,and the high content of Mn was detected in all Nanguoli pear orchards.The soil pH of the orchards was low with the average of 5.75,less than 6.5 in 83.33% of the orchards.Half orchards were at the middle level of the soil organic matter and 40% were low.Content of whole N,effective P and effective K was over moderate in 60.0%-93.33% of the orchards and 6.67%-33.3% were low.The contents of effective Zn,effective Fe,exchangeable Ca and exchangeable Mg in soil were over moderate in 63.3%-100.0% of the orchards,and parts of them were low in Zn and Fe.The soil nutrients in layer between 0 to 20 cm were higher than that between 0 to 40 cm.【Conclusions】 The mineral contents in leaves were suitable,but the content of Mn was high in the Nanguoli pear orchards in Liaoning.The soil of the overall orchards was acidic.The organic matter and mineral in the soil were at moderate level,parts of the orchards were lack of K and N.The soil nutrients of the orchards presented surface-accumulation.