| Research on characteristics of spatial distribution and availability of soil potassium forms under long-term fertilization in the dryland of the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2009.03.23 |
| Key Words: long\|term fertilization soil potassium form spatial distribution availability dryland of the Loess Plateau |
| Author Name | Affiliation | | LI Fanglin | College of Resources and Environment Northwest A ＆ F University,Yangling, Shaanxi 712100, China | | HAO Mingde | College of Resources and Environment Northwest A ＆ F University,Yangling, Shaanxi 712100, China；Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | LI Yanmin | College of Resources and Environment Northwest A ＆ F University,Yangling, Shaanxi 712100, China | | GAO Changqing | Changwu Agricultural Technology Extension Center Changwu,Shaanxi 713600, China |
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| Abstract: |
| Research on characteristics of spatial distribution and validity of soil potassium was carried out in the long\|term orientation fertilization experiment.The result showed that there was significant increase of specifically adsorbed potassium (SAK) and non\|specifically adsorbed potassium (NSAK) reserves, while the water soluble potassium (WSK) and non\|exchangeable potassium (NEK) were obviously decreased.The WSK decrease were 48.24% in the single N treatment, 32.32% in the single P treatment, 10.61% in the combination of N and P treatment, and 17.93% in the NPK treatment.The NEK decrease ranged from 8.56% to 24.91% compared to the non\|potassium applying treatment.The applying of potassium could supplement the potassium lost during the plant growing, and increase the content of WSK, NSAK and SAK in the top soil.Correlation analysis results showed that soil available K was significantly correlated with the WSK and NSAK, but not significant correlated with the SAK and NEK. |
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