Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Ionic Ratios and Crop Yield: the Mg:(mg+ca) Ratio and Genotype Interactions

Authors
item Olness, Alan
item Gesch, Russell
item Barbour, Nancy
item Archer, David
item Rinke, Jana

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: November 9, 2000
Publication Date: N/A

Technical Abstract: Resin extraction of soil permits evaluation of ratios of readily extracted elements and correlation of the concentrations obtained with crop yield. This information provides guidance on potential genotype selection and fertility management. Maize (Zea mays L.), soybean (Glycine max L.) and wheat (Triticum aestivum L.) were each grown in rotational succession annually on a 3.2-ha site. Soil samples (0 to 15 cm) were extracted with ion-exchange resins and the extracts were analyzed with ICP-AES. The data were regressed against crop yield using stepwise multiple correlation methods. Genotypic sensitivity was to unique combinations of extracted chemistries. A significant positive response to the Mg:(Mg+Ca) resin- extractable ratios were noted for soybean variety 9091 and maize hybrid 2292. The results suggest that Mg is a reasonable fertilizer. Three wheat varieties were unresponsive to the Mg:(Mg+Ca) ratio. Losses of yield potentials associated with the Mg:(Mg+Ca) ratio ranged from nil to as much as 25% as the ratio ranged from 0.2 to about 0.8. Large extractable concentrations of competing or inhibitory ions suggest banded applications of fertilizer nutrients as a reasonable management strategy; such applications overcome effects of competing ions at reasonable economic cost to the producer. Genotypes with similar response patterns are identified as compatible successive crops in a rotation.

Last Modified: 11/26/2014
Footer Content Back to Top of Page