重庆永川梨树优化施肥及氮磷钾养分年周期变化规律探究

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1、单位代码10635学号112015320001444硕士学位论文重庆永川梨树优化施肥及氮磷钾养分年周期变化规律探究论文作者：张虹指导教师：何新华教授学科专业：土壤学研究方向：梨树土壤与营养提交论文日期：2018年4月10日论文答辩日期：2018年5月28日学位授予单位：西南大学中国重庆2018年5月MasterDissertationofSouthwestUniversityStudiesonoptimalfertilizationandannualnitrogen,phosphoursandpotassiumcycleofpeartreesinYongchuan,Ch

2、ongqingMgjor:SoilScienceSupervisor:ProfessorXinhuaHeCandidate:ZhangHongChongqingChinaMay,2018论文得到国家重点研发计划项目“肥料养分推荐方法与限量标准”课题“果树养分推荐方法与限量标准”(2016YFD0200104)的资助目录目录摘要.............................................................................................................................

3、..........................IABSTRACT........................................................................................................................................III第1章文献综述............................................................................................................

4、....................11.1梨产业现状............................................................................................................................11.1.1世界及中国梨产业现状.............................................................................................11.1.2重庆梨产业现状..............

5、...........................................................................................31.2梨树营养特征........................................................................................................................31.2.1氮素养分的吸收特征.....................................................

6、............................................51.2.2磷素养分的吸收特征.................................................................................................61.2.3钾素养分的吸收特征................................................................................................71.2.4中微量元素的需求特征......

7、.......................................................................................71.3梨园养分现状........................................................................................................................71.3.1梨园土壤pH.....................................