土壤养分状况系统研究法在土壤诊断施肥中的应用

采用土壤养分状况系统研究法，在天津地区选取了５０ 个土壤样点，测定土壤中１１ 种大、中、微量元素含量，结合土壤对营养的吸附研究和盆栽试验，判断土壤中存在的和潜在的养分限制因子，初步阐明了天津主要土壤的肥力状况和增产潜力。应用 Ｃａｔｅ 和 Ｎｅｌｓｏｎ 的方法估计出８ 种元素（钙、镁、硼、钼除外）测定值在盆栽条件下的临界值。

Application of Soil Systematic Approach upon Diagnostic Fertilization in Tianjin

Through adopting the soil nutrient systematic approach,11 macro ,medium and micro elements contained in soils taken from 50 sample locations in Tianjin were analyzed,with the aim of evaluating the existing and potential soil nutrient limiting factors by using the methods of the sorption studies and pot culture trials.As a result,the soil fertility status and yield increase potential in main Tianjin soil species have been preliminarily expounded.Through applying the methods developed by Cate and Nelson,the critical values of 8 elements(except Ca,Mg,B and Mo)under the condition of pot cultures have been calculated.