摘要
研究菜园土壤有效钾的测定方法,为蔬菜合理施用钾肥提供理论依据。以36个莴笋钾肥田间试验的产量及吸钾量为参比标准,采用7种方法 (醋酸铵法、ASI法、Mehlich3法、冷硝酸法、四苯硼钠法1、四苯硼钠法2和沸硝酸法)测定土壤有效钾含量。结果表明,土壤有效钾含量以沸硝酸法>四苯硼钠法2>四苯硼钠法1>冷硝酸法>Mehlich3法>醋酸铵法>ASI法。7种测定方法测得的土壤有效钾含量间呈不同程度正相关,均具有评价土壤钾素有效性的潜力。四苯硼钠法1和四苯硼钠法2测得的土壤有效钾含量与无肥区占施钾区莴笋相对产量(RY_(CK))、缺钾区占施钾区莴笋相对产量(RY_(NP))、无肥区占施钾区莴笋相对吸钾量(RUK_(CK))的相关性均达显著水平,即其测得的土壤钾素的生物有效性均较好。综合而言,在所试验土壤地区,四苯硼钠法1和四苯硼钠法2均是评价菜园土壤当季钾素有效性的较好方法,其中以四苯硼钠法1更好。
This paper studied methods for measuring soil available potassium（ K） in order to provide scientific evidence for the reasonable application of K fertilizers to aid the cultivation of vegetables in the Chongqing suburbs. Seven methods（ NH4 OAc,ASI,Mehlich 3,HNO3,NaBPh4-1,Na BPh4- 2,and boiling HNO3） were used to measure the content of soil available K,utilizing the yields and plant K uptakes of 36 K fertilizer field experiments conducted on lettuce as reference. It was found that the seven methods varied in extraction capacity and displayed an order of boiling HNO3 Na BPh4-2 NaBPh4-1 HNO3 Mehlich3 NH4OAc ASI. The contents of soil available K measured with different methods showed positive correlation in different degrees,while all seven methods had the potential to evaluate the availability of soil K. The relative yield and relative plant K uptake were significantly correlated with the content of soil available K measured with the methods of NaBPh4-1 and NaBPh4-2,and the soil K measured with NaBPh4 was higher in bio-availability. Summarization of results showed that,in this study,the methods of NaBPh4-1 and NaBPh4-2 were superior in evaluating seasonal K-availability of vegetable soil,with NaBPh4-1 being the best.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2016年第4期150-154,共5页
Soil and Fertilizer Sciences in China
基金
国家公益性行业(农业)科研专项(201203013-5)
国际植物营养研究所(IPNI)资助项目(2012-Chongqing-02)
关键词
菜园土壤
有效钾
提取方法
生物有效性
vegetable soil
available K
extraction method
bio-availability
