Effect Models of Nitrogen,Phosphorus and Potassium Fertilizer Formulation in Banana

[Objective] The aim was to modify the application amount of N,P and K fertilizer so as to provide a reference for establishing balanced fertilization index system of banana.[Method]The N,P and K fertilizer ＂3414＂ test was carried out on banana,and then regression analysis was performed on the fertilizer effect.Ternary quadratic,binary quadric and one-variable quadratic regression equations for the fertilizer effect on the banana yield were constructed.[Result]Suitable amount of N,P and K fertilizer had significant yield improving effect,whereas overdose of fertilizer application led to decreasing of utilization rate of fertilizer.Therefore,suitable amount of N,P and K fertilizer should be selected in production.It could be concluded that one-variable quadratic regression equations was the best model to calculate the suitable fertilizer amount.The best yield range of banana in the tested field was 44.193-45.904 t/hm2,while the corresponding optimum application amount of N,P2O5 and K2O was 795.1,262.3 and 1 236.9 kg/hm2 respectively,and the ratio among nitrogen,phosphorus and potassium are 1∶0.33∶1.55.[Conclusion]The result in this study could provide references for the soil types similar to the tested field.

基于N-K模型和模糊DEMATEL的高处坠落事故致因分析

为了揭示建筑施工高处坠落事故发生机理,探究致灾因素间的影响关系,通过收集和整理我国2010—2020年发生的611条高处坠落事故报告,基于N⁃K模型构建了高处坠落事故一级风险因素耦合模型并开展了耦合交互信息值计算。结合高坠数据库特点总结了16个二级风险因素并采用模糊DEMATEL计算得到了各风险因素的中心度、原因度。结果表明:作业人员与作业环境是最重要影响因素,两者同时参与耦合后交互信息值会明显提升,应避免此类高耦合风险;安全意识淡薄、作业现场照明不足、高处作业现场安全管理不足及违法承发包、施工单位无资质是多因素耦合作用中最重要的因素;安全管理不足与违法承发包、施工单位无资质原因度为正且数值较高,应予以重点关注以降低其对其他因素的影响。