Secular and seasonal changes in soils

Burd, J; Martin, J

Secular and seasonal changes in soils

Authors

John S. Burd
J. C. Martin

Authors Affiliations

John S. Burd was Professor of Plant Nutrition; J. C. Martin was Assistant Chemist in the Experiment Station.

Publication Information

Hilgardia 5(15):455-509. DOI:10.3733/hilg.v05n15p455. April 1931.

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Abstract

Abstract does not appear. First page follows.

Variation in Yields of Barley and in Nitrogen Content of Soils

In 1915 there was initiated in this laboratory a series of observations of the effects of cropping and fallowing upon the composition of a considerable number of soils (thirteen) assembled for that purpose. These observations have continued until the present and numerous studies of the data obtained have been made and published from time to time. A unique feature of this work has been the amount of attention paid to the liquid phase and the attempts which have been made to correlate crop production with concentration.

As invariably happens after a number of years in soil experiments where no fertilizers or amendments are used, the soils have attained a condition of relative equilibrium with respect to composition and, in the case of the plots under continuous crop, the yields also now vary but little from year to year.

Literature Cited

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