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测定了浙江省11个理化性质差异较大的土壤样品的钾缓冲力(BP~k)和钾位缓冲容量(PBc~k)。并通过黑麦草耗钾试验。分析土壤BP~k、PBC~k和土壤钾临界水平的相关性。研究结果表明:(1)土壤的BP~k和PBCc~k呈显著正相关,r=0.94~(**)。其相关性主要决定于粘粒矿物的类型。(2)BP~k和PBC~k与土壤溶液钾临界水平里负相关。BP~k和PBC~k大的土壤,溶液钾的临界水平低。反之亦然。(3)BP~k和PBC~k与土壤交换性钾临界水平的相关性不密切。说明用土壤溶液钾作为有效钾的指标比用交换钾更可靠。
The potassium buffer (BP ~ k) and potassium buffer capacity (PBc ~ k) of 11 soil samples with different physical and chemical properties in Zhejiang Province were determined. And through the rye grass potassium consumption test. The correlation between the soil BP ~ k, PBC ~ k and the critical level of soil K was analyzed. The results show that: (1) Soil BP ~ k and PBCc ~ k showed a significant positive correlation, r = 0.94 ~ (**). The correlation is mainly determined by the type of clay minerals. (2) BP ~ k and PBC ~ k are negatively correlated with the critical level of potassium in soil solution. BP ~ k and PBC ~ k soil, the critical level of potassium solution is low. vice versa. (3) The correlation between BP ~ k and PBC ~ k and the critical level of soil exchangeable potassium is not close. It is more reliable to use potassium in soil solution as the index of available potassium than exchange potassium.