There is hardly a subject upon which the opinions of chemists differ more widely than upon that of the utility of soil analysis, as a means of judging of the present crop-producing power of soils, or of ascertaining in what particular element or elements their store of available plant-food most needs replenishing in order to restore or increase fertility. This difference of opinion is not because any one questions the efficiency of chemical analysis in determining the total amount of the several plant-food elements present in the soil. That is easily done. The difficulty lies in determining how much of this total amount is in such condition, or combination, as to be readily available to the growing plant. This the chemist is as yet unable to do with certainty.
Proceedings of the Iowa Academy of Sciences
©1894 Iowa Academy of Science, Inc.
Patrick, G. E.
"Chemical Analysis of Soils,"
Proceedings of the Iowa Academy of Science, 2(1), 58-66.
Available at: https://scholarworks.uni.edu/pias/vol2/iss1/20