"Agriculture expanded between 1895 and 1920 as white Americans and European immigrants settled land newly taken from Native American peoples in the West."1
This can be a difficult topic to research because it tends to be abstract and general. Still, the topic would have been important to many readers, and you will find articles documenting how the government acquired, managed, and disposed of public lands. Try keywords: "Public lands", "public grazing"; "forest reserves"; "government lands"; "pre-emption".
"The Homestead Act allows U.S. citizens to apply for title to 160 acres of land in present-day Kansas and Nebraska [...] Over the next 18 years, the act will grant more than 100,000 whites title to land formerly held by Indians. It will also influence the allotment of Indian land, by establishing 160 acres as a suitable amount of land for individual homesteads."2
Terms: "Homestead Act".
Although the Homestead Act predates most of the periodicals in Farm, Field, and Fireside, you'll still find many references to it throughout the collection. Furthermore, it was a very influential piece of legislation, and you'll better understand subsequent developments in Indian Land policy if you take a few minutes to familiarize yourself with it.
"Allotment--the division of tribal lands among individual Indians--became the dominant theme in federal Indian policy in the years between 1887 and 1934 [...] Reformers hoped that by carving up reservations and making small farmers of the Indians, they could effectively detribalize and assimilate the Indians into American culture. This policy also attracted support from those who wanted to open up tribal lands for settlement or explotation."3
Allotment was the land policy with which the federal government broke up reserved Indian lands, making them available for settlement by Americans. While you'll find some articles dealing directly with allotment, you'll find many more in which it forms an unacknowledged backdrop. For example, the article "Indians Turning Farmers" does not mention allotment by name, but the writer cleary invokes the civilizing influences of allotment. Begin with keyword searches like allotment* AND indian*.
McDonnell, Janet A. The Dispossession of the American Indian, 1887-1934. Bloominton, Ind.: Indiana UP, 1991.