1·Rhizo-box and field cultivation methods were used to study the delpletion and accumulation of organic P in maize rhizosphere on blackland and chernozem.
利用根盒培养和田间栽培方法，研究了黑土和黑钙土玉米根际有机磷的亏缺和积累的状况。
2·Elaborate environment characteristic of chernozem soil area, analysis feasibility of planting licorice with ecological benefit? zoology benefit? society benefit and production technology.
阐述了黑钙土区的环境特点，从经济效益、生态效益、社会效益及生产技术等方面分析了种植甘草的可行性。
3·The effect of application of organic materials on improving the fertility of Chernozem was studied with two-year pot culture experiments.
通过两年的盆栽试验，研究了有机物料对黑钙土的培肥作用。