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Pre‐Emergence Control of Weeds in Corn with Calcium Cyanamide 1
Author(s) -
Wolf Dale E.,
Algren Gilbert H.
Publication year - 1948
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1948.00021962004000060012x
Subject(s) - citation , virginia tech , library science , agricultural science , operations research , mathematics , computer science , biology
Forest, were chosen as follows : (~) lower area (Black Hill) from 2,ooo tO 2,200 feet elevation; (2) intermediate (Cave Creek) approximately 3,5°0 feet; and (3) upper of which there were two planting sites with elevations of about 5,3oo feet. One of these was located at Pine Creek near Young and the second at Buckhead Mesa, between Pine and Payson. Small plantings were made on the open range as well as the major plantings in fenced areas (cattle exclosure). The plantings on which these results are based were made in 1945. Brush was cut and strewn over a part of most of the plots to serve as a mulch. The annual percipitation rates are ~7.5, 1~, 24, and 22 inches, respectively. At the end of the third year (I947), the planting at Black,Hill (Table ~) and Buckhead Mesa (Table 2) were the only ones of sequence. At the former area, of the 2 ~ species tried, the two love grasses, Eragrostis lehmanniana and E. chloromelas, thus far have proved the most drought resistant. A few plants of Muhlenbergia porteri and Chloris cucullata were surviving under the mulch only (Table i). The survival at Black Hill is based on drought resistance since temperatures sufficiently low to cause freezing injury are not prevalent. However, the survival at Buckhead Mesa is dependent on ability to withstand freezing injury as well as drought. It is rather significant that in all cases of survival, much heavier stands were found under the mulch as compared to the unmulched portion of the plots. Therefore, in-the Southwest, it may be necessary to provide some sort of mulch or shade to establish permanent stands of grass in range reseeding practices.--B. IRA JUDD, Department of Agriculture, Arizona State College, Tempe, Ariz.