In the case of electronic-only journal articles, the format is similar to print journal articles, except a DOI is required. Because URLs are not as stable as DOIs, a DOI must be used instead of the URL. Provide the volume number and page numbers if they are available, however in particular page numbers typically are not assigned when an article is published strictly online. As stated earlier, in accordance with ASA, journal titles are to be abbreviated in agreement with the international standards of the Chemical Abstracts Source Service Index. Examples of these abbreviations are available in Appendix A-Abbreviations for References in the ASA-CSSA-SSSA Publications Handbook and Style Manual.

Notice the following style details:

Entries with a DOI code do not have either an access date specified or a period following the doi
Entries that lack a DOI code but instead provide a URL, do not include the words "Available at" in front of the URL and the date of access in parentheses uses the term "accessed" instead of the term "verified"; a period should end the reference entry following the closing parenthesis that includes the access date

For electronic-only journals, below are some examples of in-text citation and bibliographic format:

Bibliographic Format for Electronic Journal Articles:
Author’s Last Name, First Initial (s). Year of Publication. Title of Article. Journal Name using abbreviations. Volume Number if available:Pages if available. DOI address if available or otherwise URL and date accessed

Examples:

Doerge, T.A. 2002. Variable-rate nitrogen management creates opportunities and challenges for corn producers. Crop Manage. doi:10.1094/cm-2002-0905-01-RS

Agronomy Society of America. 2018b. Publications handbook and style manual. Agronomy Society of America; Crop Science Society of America; Soil Science Society of America, Madison, WI. https://dl.sciencesocieties.org/publications/style/ (accessed 7 Jan. 2018).

In-text citation:
(Author’s Last Name, Year of Publication)

Examples:
(Doerge, 2002)

(Agronomy Society of America, 2018b)