Abstract: Objective The objective of this experiment is to measure temporal variations in the leaf mineral nutrient contents of Korla pear in order to make fertilizer recommendations in the region.MethodEighteen Korla pear orchards were divided into three groups based on yield:(i)low-yielding orchards,(ii)medium-yielding orchards,and(iii)high-yielding orchards.The leaf samples were collected every 15 d between April 28 and Sept 23 in 2015.The contents of N,P,K,Ca,Mg were detected during the annual growth cycle of different yield Korla pear orchard using leaf analysis method.ResultContents of N,P and K leaf declined from April 28 to September 23 in low-yielding,medium yielding and high-yielding orchard,and contents of Ca,Mg leaf increased.N content and P content,respectively,in May 28 and June 12 as the dividing line,during the early stage,it declined rapidly and declined slowly later;K content in June 12 as the dividing line,rose slowly during the early stage and declined rapidly in the latter period;Leaf K contents rose slowly until June 12 and then declined rapidly.Leaf Ca contents rose rapidly until July 18 and then declined slowly.Leaf Mg contents rose slowly until June 12 and then rose and declined slowly,and then declined slowly during the rest of the growing season.The annual mean value of K content in the leaves of high yield orchard was higher than that in medium and low yield orchards;the annual mean values of N,P and Ca contents in the leaves of the medium yield orchard were higher than those of the other twos;the annual mean value of Mg content in the leaves of low yield orchard was higher than that of the other twos.The results of correlation analysis showed that the pear leaf P contents,leaf Ca contents were both positively correlated with yield in September 10.Mg content in May 14,June 27,September 23 average daily and yield was extremely negatively correlated.ConclusionIn Korla area,the content of N and P in the leaves of Korla pear planted in high,medium and low yield orchards were respectively on May 28 and June 12 as the dividing line,and the early consumption was larger;K and Ca contents were respectively on June 12,July 28 as the dividing line,and the later consumption was larger;the consumption of Mg was greater after August 27.In the actual production,according to the change rule of the requirement of each mineral element in different periods,combined with the correlation between the element and the yield garden,the fertilization is reasonable,and the purpose of high yield and high quality cultivation has been achieved.