Abstract. Should not exceed 250 words. Avoid abbreviations, diagrams, and references. It must be complete and understandable without reference to the text. Uninformative phrases, such as ‘‘the results are discussed'' or ‘‘implications have been considered in this paper'' are not acceptable.

Keywords. Identify important subjects covered by the article that are not listed in the Title. Authors must provide from three to ten alphabetized keywords or two-word key phrases. They should be placed following the Abstract.

Headings. All headings for sections and subsections should be typed in lowercase letters and placed on separate lines. Do not underline any headings.  

References. Literature citations in the text should be by author's surname and year; when references are by three or more authors abbreviate to the first surname and et al.: ‘‘Smith (1982) has shown. . . Previous work (Smith & Jones, 1982; Jackson, 1983a, b) has demonstrated that . . . Jackson et al. (1982) have shown that . . .'' The list of citations should be given in alphabetical order, with all authors and editors listed. Full titles of periodicals, books and articles, and full pagination of articles should be given. Follow these examples:

Journal article: Halvorson, J. J., H. Bolton Jr., and J. L. Smith. 1997. The pattern of soil variables related to Artemisia tridentata in burned shrubsteppe site. Soil Science Society of America Journal 61: 287–294.

Tables and Figures. Tables and figures should not be embedded in the text, but should be included as separate sheets or files. A short descriptive title should appear above each table with a clear legend and any footnotes suitably identified below.All abbreviations should be described in footnotes, indicated by superscript letters, beginning with a in each table. Use of explanatory footnotes is encouraged. Do not use vertical lines to separate columns. Horizontal lines are used to separate headings only.

Color Reproduction. Color illustrationswill be considered for publication; however, the author will be required to bear the full cost involved in color art reproduction. Color art can be purchased for online only reproduction or for print þ online reproduction. Color reprints can only be ordered if printþonline reproduction costs are paid. Rates for color art reproduction are: Online Only Reproduction: $225 for the first page of color; $100 per page for each of the next three pages of color. A maximum charge of $525 applies. Print+Online Reproduction: $900 for the first page of color; $450 per page for each of the next three pages of color. Acustom quote will be provided for articles with more than four pages of color. Art not supplied at a minimum of 300 dpi will not be considered for print.  

Units of Measurement and Abbreviations. Use of the International System of Units (SI, Syste`me international d'unite´s) is required. In the text and tables use the minus index (e.g., ug h1) instead of a slash and conform with the SI abbreviations. Use chemical designations instead of spelling out common chemical names (e.g., ‘‘CO2 release, C and N cycling, HC1, N2-fixation''). Define each uncommon abbreviation and introduce it in parentheses the first time it is used, e.g., ‘‘modified universal buffer (MUB) was used.'' The conventional designation of author's name(s) of a binomial scientific name of organism must be noted the first time the name of the organism is introduced in the main text (except in the title). Fertilizer values should be expressed in terms of P, K, etc., not P2O5, K2O, etc.

Notes. Notes, not exceeding 1500 words, are intended for the presentation of brief research reports that do not warrant fulllength papers. The Notes receive the same review, and they are not considered preliminary communications. Each Note must have an Abstract of no more than 100 words and Keywords. Do not use section headings in the body of the Note. The number of figures and tables be kept to a minimum. The References section is identical to that of full-length papers.

Page charges. Part of the publication cost is covered by a page charge of $40.00 per printed page. If these charges are paid, the author will receive 50 offprints of the article. The acceptance and publication of papers are not dependent to the payment of these charges.