Onken, A.B. and Matheson, R. and Williams, E.J.
(1980)
Evaluation of EDTA-extractable phosphorus as a soil test procedure.
Soil Science Society of America Journal, 44 (4).
pp. 783-786.
Abstract
Diagnostic techniques involving complex systems such as soils and plants are rarely infallable. Thus, a constant research effort is underway to improve decision making by adding information to presently used methods and/or developing new techniques.
Predicting crop response to applied P requires a suitable extractant and a model that satisfactorily describes the yield response. A number of extractants and yield response models have been proposed and evaluated over the last 50 years. The objectives of the research reported here were to (i) develop a satisfactory procedure for extraction of P using one of these extractants (EDTA), (ii) evaluate this procedure using current mathematical and statistical models, and (iii) compare this procedure (by use of the models) with current procedures in order to determine if decision-making could be improved.
Soil samples of four soil series from 23 location-years of irrigated fertilizer response trials with grain sorghum (Sorghum bicolor L. Moench) were extracted with ammonium acetate, sodium bicarbonate, and EDTA. Extraction time for EDTA was established utilizing soils from two locations of known P response. The extraction procedures were evaluated by the following models: linear, quadratic, logarithmic, Mitscherlich, and the Cate-Nelson analysis of variance method
Actions (login required)
 |
View Item |
![[img]](http://eprints.icrisat.ac.in/style/images/fileicons/application_pdf.png)
