吉林黑土上肥料施用量对玉米产量及肥料利用率的影响

通过 1996和 1998两年田间试验 ,研究了吉林黑土上化肥对玉米的增产效应及肥料利用率 ,得出N肥是主导的增产因素 ,其最佳产量和最佳施肥量分别为 12 738 6kg/hm2 和 2 91 6kg/hm2 ,及 115 42 7kg/hm2 和2 77 8kg/hm2 ;不同N肥用量下肥料利用率分别变化在 32 3%～ 6 4 3%及 35 5 %～ 6 2 2 %之间 ,并根据最佳产量找出最佳利用率分别在 49%和 5 1%左右。

吉林省黑土区玉米精准施肥与病虫害防治技术

阐述了吉林省黑土区在气候条件、土壤条件、现代化管理条件3方面种植玉米的优势;分析了吉林省黑土区发展玉米种植产业的制约因素;重点探讨了吉林省黑土区玉米精准施肥技术,包括对土壤进行采样分析、对精准施肥系统的开发、对于土壤养分空间变异性的分析、根据结果确定精准施肥措施、施肥与灌溉有效结合等方面内容;提出了玉米病虫害综合防控技术。

Application of principal component analysis to evaluation of black soil degradation in Jilin

Principal Component Analysis(PCA) can simplify the structure of database by replacing multi-dimensional parameters with relatively less comprehensive variables in order to ensure the minimum lost in initial data.In this paper,eighteen black soil samples from different sites were tested and thirteen distinctive indexes were chosen to evaluate the degeneration of black soil.By using principal component analysis,variables of thirteen dimensions can be diminished to six unrelated principal indexes.Analysis shows that the soluble salt content,Fulvic acids(FA) and aggregation degree have a high weighing coefficient,indicating these three indexes are the major parts for the evaluation of black soil degradation.It also provides a new path to the degenerated black soil treatment in Northeast China.