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Movement of fertilizer and limestone in a Tatum clay loam

 

作者: J. E. Rechcigl,   R. B. Reneau,   D. E. Starner,  

 

期刊: Communications in Soil Science and Plant Analysis  (Taylor Available online 1985)
卷期: Volume 16, issue 4  

页码: 427-438

 

ISSN:0010-3624

 

年代: 1985

 

DOI:10.1080/00103628509367616

 

出版商: Taylor & Francis Group

 

关键词: Plowsole lime;plowsole fertilizer;lime movement;fertilizer movement;soil pH;exchangeable Al

 

数据来源: Taylor

 

摘要:

Surface applied lime and fertilizer normally move slowly through soils and are only beneficial in the immediate zone of application. One means for correcting subsurface acidity and potentially enhancing deeper root development is plowsole application of lime, but limited information is available on movement of lime and fertilizer placed in the plowsole. In 1980 dolomitic limestone in combination with varying levels of P and K were applied in the plowsole at a depth of 30 cm, to a Tatum clay loam (Typic Hapludult, clayey, mixed, thermic). In 1982 soil samples were collected from the Ap (0 to 5 cm), the plowsole depth (30 cm), 5 and 10 cm above and below the plowsole and at the 45 and 100 cm depths and analyzed for pH, exchangeable Al, Ca, Mg, K, and extractable P. Soils that did not receive lime had lower pH and increased Al concentrations compared to lime treated plots. Plowsole placement of lime increased pH and decreased Al, particularly at the 25 to 35 cm depth. Calcium and Mg applied in the plowsole from dolomitic limestone were present in high concentrations in the plowsole layer with little indication of leaching through the soil. Elevated levels of exchangeable Ca and Mg were present in the top 10 cm of the soil profile as a result of surface application of lime. The plowsole‐applied K movement was discernible throughout the 20 to 50 cm soil zone. Part of the surface‐applied P had moved to the 30 cm depth, while the plowsole‐applied P remained in place. The data reported in this paper shows that plowsole application of lime does alleviate subsoil acidity and that there is little movement of fertilizer constituents from the zone of application.

 

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