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	Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals
	Zhou, J. M.; Huang, P. M.
刊名	CANADIAN JOURNAL OF SOIL SCIENCE
	2006-11-01
卷号	86期号:5页码:799-811
关键词	potassium release kinetics and mechanisms phosphates potassium-bearing primary minerals
ISSN号	0008-4271
通讯作者	Huang, P. M.(huangp@sask.usask.ca)
英文摘要	A high concentration of phosphate in the immediate vicinity of the phosphate fertilizer zone of soil could induce K release from K-bearing minerals to soil solution. In this study, the kinetics of K release by monoammonium phosphate (NH4H2PO4) from biotite, muscovite, and microcline were investigated. The results indicate that K release from all of these minerals was promoted by 1 M NH4H2PO4 (pH 4.0). The release of K from these minerals can be described by the zero-order rate equation. The rate coefficients of K released from the minerals (2-5 mu m) in 1 M NH4H2PO4 solution ranged from 0.20 to 2.09 mg kg(-1) h(-1) at 25 degrees C and from 1.22 to 9.00 mg kg(-1) h(-1) at 45 degrees C, respectively. The amount of K release from the same mineral samples in I M NH4Cl solution (pH 4.0) at 25 degrees C was not detectable and was too low to be determined accurately at 45 degrees C. The differences in the rate of NH(4)A(2)PO(4)-induced K release from the different minerals were explained by the chemical composition, crystal structure, and the crystallization sequence of the minerals. The activation energies of the phosphate-induced K release from these minerals ranged from 37 to 72 kJ mol(-1) and the pre-exponential factor values (Arrhenius equation) ranged from 1.2 x 10(6) to 7.2 x 10(11) mg kg(-1) h(-1). The examination of the phosphate-reacted minerals shows the formation of crystalline NH4-taranakite in the muscovite and microcline systems and noncrystalline products in the biotite system. The absence of the formations of crystalline NH4-taranakite in the biotite system is attributed to the Fe perturbation. These data indicate that the major mechanism of NH4H2PO4-induced K release from the K-bearing minerals was the combined effect of phosphate and protons on the alteration of minerals. Therefore, the K-supplying rate of soils in the immediate vicinity of fertilizer zones may be enhanced through phosphate fertilization.
收录类别	SCI
WOS关键词	ECTOMYCORRHIZAL FUNGI ; TARANAKITE FORMATION ; DILUTE-SOLUTIONS ; ORGANIC-ACIDS ; SOILS ; DISSOLUTION ; FIXATION ; PERTURBATION ; TEMPERATURE ; MAGNESIUM
WOS研究方向	Agriculture
WOS类目	Soil Science
语种	英语
出版者	AGRICULTURAL INST CANADA
WOS记录号	WOS:000245528400004
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558574
专题	南京土壤研究所
通讯作者	Huang, P. M.
作者单位	1.Univ Saskatchewan, Dept Soil Sci, Saskatoon, SK S7N 5A8, Canada 2.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Zhou, J. M.,Huang, P. M.. Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals[J]. CANADIAN JOURNAL OF SOIL SCIENCE,2006,86(5):799-811.
APA	Zhou, J. M.,&Huang, P. M..(2006).Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals.CANADIAN JOURNAL OF SOIL SCIENCE,86(5),799-811.
MLA	Zhou, J. M.,et al."Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals".CANADIAN JOURNAL OF SOIL SCIENCE 86.5(2006):799-811.

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