Arid
DOI10.1016/j.clay.2018.08.008
Assessment of potassium release threshold levels of Vertisols (shrink-swell soils) in different agro-ecological regions of India
Gurav, Priya P.1; Datta, S. C.2; Ray, S. K.3,4; Choudhari, P. L.5; Ahmed, N.5
通讯作者Gurav, Priya P.
来源期刊APPLIED CLAY SCIENCE
ISSN0169-1317
EISSN1872-9053
出版年2018
卷号165页码:155-163
英文摘要

Studies to evaluate the release threshold level of potassium in Vertisols (shrink-swell soils) in different agro-ecological regions of India and how that may help in K fertility interpretations are rare. Thus the objectives of this study were (i) to evaluate the K status of Vertisols through release threshold levels and (ii) to relate the findings with soil K release and fertilizer management. Three established soil series samples were collected from Vertisols of different agro-ecological regions of India. Release threshold level (RTL) was assessed after equilibrating soil with 0.01 M CaCl2 solution having series of soil: solution ratio, after which the remaining amount of exchangeable K was extracted with 1 N NH4OAc (pH 7). Total amount of K extracted (K-T = K desorbed in CaCl2 solution plus K extracted with 1 N NH4OAc) remained more or less constant with decreasing K-level up to a certain value (say threshold value) below which K-T increased sharply indicating K release from non-labile form. The threshold value in terms of K concentrations (Release Threshold Concentration) of Panjari, Nagpur, Maharashtra (Typic Haplusterts, Sub-humid dry), Teligi, Bellary, Karnataka (Sodic Haplusterts, Semi-arid dry) and Kheri, Jabalpur, Madhya Pradesh (Typic Haplusterts, Sub-humid moist) soils were 0.044-0.049, 0.034-0.062 and 0.043-0.11 mm, respectively. The high release threshold K levels in terms of concentration and activity ratio (AR) were observed in soils of Teligi and Kheri series as compared to soils of Panjari series due to high content of trioctahedral mica in the former two soils. The relationships between clay minerals, release threshold level, exchangeable potassium and non-exchangeable potassium determined by 1 N HNO3 and sodium tetra-phenyl borate (NaBPh4) have been discussed.


英文关键词Threshold value K concentration Activity ratio Exchangeable K K release Vertisols
类型Article
语种英语
国家India
收录类别SCI-E
WOS记录号WOS:000445980400017
WOS关键词NONEXCHANGEABLE POTASSIUM ; MINERALOGY ; FIXATION
WOS类目Chemistry, Physical ; Materials Science, Multidisciplinary ; Mineralogy
WOS研究方向Chemistry ; Materials Science ; Mineralogy
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/207606
作者单位1.ICAR IISS, Div Soil Chem & Fertil, Bhopal, India;
2.ICAR IARI, Div Soil Sci & Agr Chem, New Delhi, India;
3.ICAR NBSS, Reg Ctr, Jorhat, Assam, India;
4.LUP, Jorhat, Assam, India;
5.Dr PDKKV, Akola, India
推荐引用方式
GB/T 7714
Gurav, Priya P.,Datta, S. C.,Ray, S. K.,et al. Assessment of potassium release threshold levels of Vertisols (shrink-swell soils) in different agro-ecological regions of India[J],2018,165:155-163.
APA Gurav, Priya P.,Datta, S. C.,Ray, S. K.,Choudhari, P. L.,&Ahmed, N..(2018).Assessment of potassium release threshold levels of Vertisols (shrink-swell soils) in different agro-ecological regions of India.APPLIED CLAY SCIENCE,165,155-163.
MLA Gurav, Priya P.,et al."Assessment of potassium release threshold levels of Vertisols (shrink-swell soils) in different agro-ecological regions of India".APPLIED CLAY SCIENCE 165(2018):155-163.
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