贵阳市马铃薯耕层土壤养分丰缺指标建立初探

Discussion on the Establishment of Nutrient Plentiful-Lack Index of Plowed Layer in Potato Fields in Guiyang

通过开阳县、修文县、息烽县在测土配方施肥项目中开展22组"3414"的肥效试验,了解氮、磷、钾缺素区马铃薯相对产量与土壤氮磷钾养分含量之间的相关关系,拟合对数方程,初步探索建立贵阳市马铃薯土壤养分丰缺指标。结果表明,以极缺乏、缺乏、适宜、最适宜、丰富、极丰富6级划分标准,马铃薯土壤有效氮丰缺指标为小于42 mg/kg、42~59 mg/kg、59~84mg/kg、84~118 mg/kg、118~168 mg/kg、大于168 mg/kg,有效磷丰缺指标为小于11 mg/kg、11~19 mg/kg、19~35 mg/kg、35~49 mg/kg、49~66 mg/kg、大于66 mg/kg,速效钾丰缺指标为小于22 mg/kg、22~43 mg/kg、43~83 mg/kg、83~192 mg/kg、192~219 mg/kg、大于219 mg/kg,均高于第次土壤普查分级标准,氮肥施用对马铃薯的增产效果优于磷肥和钾肥。

By analyzing the results of22potato field experiments in Guiyang,the soil nutrient rich-lack index were determined.Theresults indicated that the nutrient rich-lack index of nitrogen was<42,42?59,59?84,84~118,118?168,>168mg/kg withthe rank of extremely deficient,deficient,suitable,most suitable,rich,extremely rich;and phosphorus rich-lack index was<11,11~19,19~35,35~49,49~66,>66mg/kg,and potassium rich-lack index was<22,22~43,43~83,83~192,192~219,>219mg/kg,were higher than that of the second soil survey classification standard.The effect of nitrogen fertilizer on potatoyield was better than that of phosphate fertilizer and potassium fertilizer.