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.[Method]Eighteen 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.[Result]Contents 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.[Conclusion]In 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.

摘要： [目的]研究库尔勒香梨叶片中矿质营养元素含量的变化规律,为梨园施肥提供参考.[方法]根据产量不同,将18个库尔勒香梨园平均分为高、中、低产园,从2015年4月28日～9月23日,每隔15 d采样一次.叶分析法检测年生长周期内不同产量园库尔勒香梨叶片中N、P、K、Ca、Mg的含量.[结果]4月28日～9月23日,高、中、低产园库尔勒香梨叶片中的N、P、K含量整体呈下降趋势,Ca、Mg含量整体呈上升趋势,各产园在相同元素上表现出的变化趋势基本一致.库尔勒香梨叶片中的N含量和P含量,分别以5月28日和6月12日为分界线,前期急速下降,后期缓慢下降;K含量以6月12日为分界线,前期缓慢上升,后期急速下降;Ca含量以7月28日为分界线,前期急速上升,后期缓慢下降;Mg含量以6月12日和8月27日为分界线,前期缓慢上升,中期缓慢起伏变化,后期缓慢下降.高产园叶片中K含量的年平均值较中、低产园高;中产园叶片中N、P、Ca含量的年平均值比其他两个产园高;低产园叶片中Mg含量的年平均值高于其他两个产园.9月10日库尔勒香梨叶片中的P含量、Ca含量均与产量呈极显著正相关,Mg含量在5月14日、6月27日、9月23日均与产量呈极显著负相关,其余均未达到显著水平.[结论]库尔勒地区,高、中、低产园库尔勒香梨叶片中的N含量和P含量分别以5月28日、6月12日为分界线,前期消耗量较大;K含量和Ca含量分别以6月12日、7月28日为分界线,后期消耗量较大;Mg含量在8月27日以后消耗量较大.在生产中根据香梨对各矿质元素在不同时期需求的变化规律,结合元素与产量园的相关性合理施肥,达到丰产优质栽培的目的.