中国桃土壤速效钾丰缺指标与适宜施钾量研究

为了科学指导中国的桃测土施钾,采用“零散实验数据整合法”和“养分平衡—地力差减法”新应用公式,开展了中国桃土壤速效钾丰缺指标与适宜施钾量研究。结果表明:中国桃土壤速效钾第1～5级指标依次为≥312、170～312、92～170、50～92、<50 mg/kg。当桃的目标产量为15～60 t/hm²、钾肥利用率为50%时,桃土壤速效钾第1～5级的适宜施钾量范围依次为0～0、19～76、38～151、57～227、76～302 kg/hm²。本研究初步建立了中国桃土壤速效钾丰缺指标推荐施肥系统,为中国桃测土施钾提供了相应的科学依据。

Abundance-Deficiency Index of Soil Available Potassium and Appropriate Fertilizer Application Rates for Peach Planting in China

To provide guidance for soil potassium application in peach planting, the new application formulas of “scattered experimental data integration method” and “nutrient balance-soil fertility difference subtraction method” were used to study the index of soil available K abundance-deficiency and the appropriate rates of potassium application in peach planting in China. The results showed that soil available K index in peach planting could be divided into 5 levels, which were ≥312, 170-312, 92-170, 50-92 and <50 mg/kg, respectively, from level 1 to 5. When the target yield of peach was 15-60 t/hm² and the utilization rate of potassium was 50%, the suitable application rate of available K for level 1 to 5 was 0-0, 19-76, 38-151, 57-227 and 76-302 kg/hm², respectively. In this study, the recommended fertilization system of available K according to its abundance-deficiency index in peach planting soil in China was established and a corresponding basis was provided for soil testing and potassium application.