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Available Phosphorus Status of Nebraska Soils in Relation to Series Classification, Time of Sampling and Method of Measurement 1
Author(s) -
Olson R. A.,
Rhodes M. B.,
Dreier A. F.
Publication year - 1954
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1954.00021962004600040009x
Subject(s) - relation (database) , library science , citation , computer science , mathematics , data mining
SOIL testing can be a most useful tool for prescribing to farmers the fertilizer nutrient needs of crops to be grown. Recently in Nebraska, as throughout much of the United States, a considerable demand for quick and reliable testing procedures has been placed on the Extension Service and Experiment Station for supplying these prescriptions. It goes without saying that the efficacy of any soil testing program depends upon an accurate calibration of the procedures employed and knowledge of the contingent limitations of each test. In recent work measuring correlations between quick tests for phosphorus and "A values", the Bray and Kurtz No. 1 and NaHCO3—'soluble phosphorus methods were outstanding among those investigated (9, 21). It thus seemed expedient to obtain further evaluation of these and other soluble phosphorus testing methods at this time and to calibrate them to Nebraska conditions. Other objectives were to classify further the major Nebraska soil series as to their phosphorus status, and to study the availability of soil phosphorus throughout the growing season.