The effects of liming on the liberation of Potassium in some Iowa soils

Thumbnail Image
Date
2017-05-31
Authors
Dean, Hartzell
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Authors
Research Projects
Organizational Units
Organizational Unit
Extension and Experiment Station Publications
It can be very challenging to locate information about individual ISU Extension publications via the library website. Quick Search will list the name of the series, but it will not list individual publications within each series. The Parks Library Reference Collection has a List of Current Series, Serial Publications (Series Publications of Agricultural Experiment Station and Cooperative Extension Service), published as of March 2004. It lists each publication from 1888-2004 (by title and publication number - and in some cases it will show an author name).
Is Version Of
Versions
Series
Abstract

The effects of lime on the liberation of potassium in a number of Iowa soils were studied in a series of experiments and the results obtained are summarized as follows:

1. Analyses of 12 high-lime soils showed that all of the soils contained relatively large amounts of total potassium, carbonates and total nitrogen.

2. The available potassium content of 11 of the 12 high-lime soils was insufficient for maximum plant growth according to the Aspergillus niger test. This low content of available potassium was correlated with the high carbonate content.

3. The exchange complex of an acid Tama silt loam was completely saturated by applications of 6 tons of calcium carbonate per acre in greenhouse experiments and 6 months after treatment the amounts of exchangeable and available potassium were decreased.

4. Calcium carbonate, calcium chloride and calcium hydroxide replaced potassium and increased the available potassium in the soil exchange complex in acid Tama silt loam and to a smaller extent in basic Webster silty clay loam, calcium chloride being the most effective. Calcium sulfate had little or no effect on the exchangeable and available potassium.

5. The availability of potassium in high-lime soils was lower in inoculated than in uninoculated soils and the decrease in availability was greater in soils treated with calcium carbonate than in the untreated soils.

6. It is suggested that a decreased hydrolysis of primary potassium-bearing minerals and the formation of insoluble potassium complexes and possibly also a reduction in available potassium by microorganic activity may be responsible, in part at least, for the decreased availability of potassium in these soils.

Comments
Description
Keywords
Citation
DOI
Source
Copyright
Collections