SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 20:36-40 (1956)
© 1956 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Test Summaries for Predicting Fertilizer Ratios and Type of Lime Needed1

J. W. Fitts, C. D. Welch and W. L. Nelson2

ABSTRACT

Soil test summaries have been instrumental in preparing general fertilizer recommendations on an area basis rather than for the state as a whole. Results for phosphorus and potassium, when summarized together in a two-way table, give a good indication of the ratios of these nutrients most needed in fertilizers. The summary tables were blocked off to show the number of pounds of P2O5 and K2O recommended at different fertility levels for the various crops. The percentage of samples in the various categories indicates the proportion of fertilizer ratios needed.

Two-way summary tables were prepared to determine the relationship of calcium and magnesium in North Carolina soils. Regardless of soil region, crops grown, or the level of calcium and magnesium, the ratio of the two elements remained remarkably constant. In general, the ratio of magnesium to calcium was about 1 to 5 which indicates that most soils throughout the state that need liming should receive a dolomitic limestone.

NOTES

1 Published with the approval of the Director of Research, North Carolina Agr. Exp. Sta. as paper No. 701. Presented before Div. IV, Soil Science Society of America, St. Paul, Minn., Nov. 11, 1954.

2 Director of Soil Testing Division, North Carolina Department of Agriculture and Professor of Agronomy, North Carolina State College; Soil Testing Specialist, N. C. Dept. of Agriculture and Extension Agronomist, N. C. State College; and former Professor of Agronomy, N. C. State College.

Received for publication October 25, 1954.




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Copyright © 1956 by the Soil Science Society of America.