【摘要】 研究了在推行秸秆还田技术、土壤肥力状况发生了显著变化的条件下冬小麦磷、钾丰缺指标,采用以缺肥区与全肥区的籽粒相对产量与土壤有效养分测定值的回归关系进行分级的方法,确定土壤养分丰缺指标。结果表明,土壤有效磷的丰缺指标:测定值(P)<2.4 mg/kg为极度缺乏,2.4~10.3 mg/kg为重度缺乏,10.3~18.5 mg/kg为中度缺乏,18.5~33.3 mg/kg为中等,测定值>33.3 mg/kg为丰富。土壤有效钾的丰缺指标:测定值(K)<30.5 mg/kg为极度缺乏,30.5~67.2 mg/kg为重度缺乏,67.2~92.0 mg/kg为中度缺乏,92.0~126.5 mg/kg为中等,>126.5 mg/kg为丰富。与20世纪80-90年代建立的丰缺指标相比,各级指标均有明显提高。更多还原

【Abstract】 This paper was conducted to study the abundance and deficiency indices of phosphorus and potassium of winter wheat under the conditions of straw returning and soil fertility having changed significantly.Adopted grading methods to study the polynomial regression between the relative yield of wheat grain in lack fertilizer plots and whole fertilizer plots and the content of available nutrients in soil,the test analysed the abundance and deficiency indices of soil nutrients.The results indicated that the content of available phosphorus <2.4 mg/kg was extreme lack of available phosphorus;the content of 2.4-10.3 mg/kg was severe lack;the content 10.3-18.5 mg/kg was moderate lack;the content of 18.5-33.3 mg/kg was medium;the content >33.3 mg/kg was abundance.the content of available potassium <30.5 mg /kg was extreme lack of available potassium;the content of 30.5-67.2 mg/kg was severe lack;the content 67.2-92.0 mg/kg was moderate lack;the content of 92.0-126.5 mg/kg was medium;the content was >126.5 mg/kg was abundance.compared to the abundance and deficiency indices established in 1980s-1990s,the indices had significantly increase.更多还原