Nonexchangeable Soil Research Articles

Availability of Nonexchangeable Soil Potassium to Plants as Affected by Added Potassium and Ammonium

AbstractUndried Marshall and Clarion surface and subsoil samples were cropped in the greenhouse (short‐term cropping) to determine the effect of NH4 and K additions on the availability of nonexchangeable soil K to corn plants. When 0, 10, 25, 50 and 100 mg. of NH4 was added to 100 g. of soil, the corn absorbed 21.8, 16.4, 11.6, 4.96 and 0.12 mg. of nonexchangeable K from the Marshall surface soil and 5.19, 4.74, 3.55, 0.91 and −1.44 mg. from the Clarion surface soil. This reduction in the uptake of non‐exchangeable K by plants was due to the blocking effect of NH4 on the release of K, and was not an effect of NH4 on the absorption of available K. Similar results were obtained with the Marshall subsoil. The Clarion subsoil, however, did not release K even in the absence of added NH4.K additions also reduced the release of nonexchangeable soil K. When NH4 and K were both added, the order of addition proved to be important because NH4 also blocked the release of added K that was fixed by the soil.

Release of Nonexchangeable Soil Potassium During Short Periods of Cropping and Sodium Tetraphenylboron Extraction

AbstractUndried soils were cropped in the greenhouse to determine the short‐term release of nonexchangeable K under intensive cropping conditions. Using corn root mats with plants intact, it was found that 218, 59, 50 and −1 ppm. nonexchangeable K was released in 10 days by Marshall surface and subsoil and Clarion surface and subsoil samples, respectively, that had received no NH4 or K additions. It was concluded that this short‐term cropping method could be used to study factors that affect the availability of nonexchangeable soil K to plants.Nonexchangeable K was also extracted from the undried soils by two chemical methods that tend to reduce the blocking effect of replaced K. Single extractions with a NaOAc‐NaBPh4 solution removed more nonexchangeable K than five successive NaCl‐HCl extractions or 5‐day cropping periods. The corn plants and the NaCl‐HCl solution, however, continued to remove K when the extraction period was increased whereas the NaOAc‐NaBPh4 solution did not.

Available Nonexchangeable Soil Potassium at Three Northern Great Plains Locations by a Neubauer Procedure

Soil Science Society of America JournalVolume 14, Issue C p. 101-105 Section II—Soil Chemistry Available Nonexchangeable Soil Potassium at Three Northern Great Plains Locations by a Neubauer Procedure† R. F. Reitemeier, R. F. ReitemeierSearch for more papers by this authorR. S. Holmes, R. S. HolmesSearch for more papers by this authorI. C. Brown, I. C. Brown Senior Soil Scientist, Chemist, and Associate Chemist, respectively. The service rendered by members of station staffs in supplying soil samples is gratefully acknowledged.Search for more papers by this author R. F. Reitemeier, R. F. ReitemeierSearch for more papers by this authorR. S. Holmes, R. S. HolmesSearch for more papers by this authorI. C. Brown, I. C. Brown Senior Soil Scientist, Chemist, and Associate Chemist, respectively. The service rendered by members of station staffs in supplying soil samples is gratefully acknowledged.Search for more papers by this author First published: 01 January 1950 https://doi.org/10.2136/sssaj1950.036159950014000C0023xCitations: 4 ‡ Contribution from the Division of Soil Management and Irrigation, Bureau of Plant Industry, Soils, and Agricultural Engineering, Agricultural Research Administration, U. S. Dept. of Agriculture, Beltsville, Md. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume14, IssueC1950Pages 101-105 RelatedInformation