The determination of soil reaction under field conditions by means of the spear-type glass electrode
1937
McGeorge, W.T.
It is believed that the spear type of electrode has supplied a long-felt need to the soil specialist and agronomist. In it we have equipment and a method which yields a value that truly represents the pH of the soil under any and all growing conditions. In addition to this it opens up an unlimited field of application to nutritional and plant behavior studies which involve soil reaction in acid, neutral, and alkaline soils. It has been in use in this laboratory for several months and the results may be obtained quickly and accurately and can be closely duplicated. The electrodes are thoroughly cleansed with a stream of distilled water after each determination to remove adhering soil after which the electrodes are gently wiped with soft paper tissue. This leaves the electrodes slightly damp and assures immediate contact with the soil. The Beckman type pH meter was used in these experiments because of the spear type of electrode and the extension cable which especially adapts it to this sort of work.
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