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《Chinese Journal of Soil Science》 2006-01
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Potassium Fixation and Release in Paddy Soils Derived from Different Parent Materials in Guangdong Province

GAO Shu-tao~1,LI Hua-xing~(2*),GUO Qing-rong~1(1.Guangdong Institute of Eco-environment and Soil Sciences,Guangzhou 510650;2.Department of Soil Science,South China Agricultural University,Guangzhou 510642)  
The characteristic of Potassium fixation and release of the key paddy soils derived from different parent materials was studied by an simulation experiment and chemical methods.The results showed that K fixation in soils derived from sandstone,Pearl River Delta deposits,limestone and basalt increased with the increasing of K application,however,the soil derived from granite had the contrary situation.K fixation of soils derived from sandstone,granite and basalt was supreme when submerging water,while it was supreme to soils derived from Pearl River Delta deposits and limestone when wetting.The total amount and mean release rate of non-exchanged Potassium of soil derived from Pearl River Delta deposits were higher significantly than that of the others soils.The factor affecting non-exchanged potassium release of soil by K application was varied with the soil mineral type.
【Fund】: 广东省“九五”重点攻关项目(9622035-01);; 广东省自然科学基金项目(970386 000188)
【CateGory Index】: S158
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