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University of Arizona (1978)

Chemical control of the annual weeds on southern Arizona rangeland

Al-Mashdany, Showket Abdalah

Titre : Chemical control of the annual weeds on southern Arizona rangeland

Auteur : Al-Mashdany, Showket Abdalah

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1978

Résumé
Rangeland plots were treated with a variety of herbicides to determine the most effective means of control ling weeds and preserving established perennial grasses. Atrazine, dalapon, dicamba, linuron, diuron, DCPA, and tebuthiuron were applied preemergence. Picloram, MSMA, di camba, glyphosate, 2,4-D, and paraquat were applied to the foliage (postemergence). Each group of herbicides was examined in winter and summer of 1977. Preemergence winter applications were unsatisfactory. Dicamba (2 kg/ha) was the most effective and removed 88# of the dormant winter weeds. Postemergence application of glyphosate and picloram were the most effective. Most of the summer treatments allowed good to excellent control of both broadleaf and grassy weeds. Atrazine and dicamba (2 kg/ha) gave 97-100# control. Tebuthiuron (1 kg/ha) re moved all of the annual summer weeds. DCPA was more effec tive on grassy weeds than broadleaves, diuron controlled 93-100# and dalapon removed 90# of the annual weeds. Post emergence summer treatments showed that dicamba, MSMA, and picloram (2 kg/ha) removed all weeds. More broadleaf weed control was obtained with 2,4-D (0.5, 1 and 2 kg/ha). Se vere, but temporary, grass stands damage followed 2 kg/ha applications of picloram and paraquat. Dalapon caused 67# damage.

Mots clés : Grasslands — Arizona. ; Grasses — Arizona. ; Weeds — Control — Arizona. ; Santa Rita Experimental Range (Ariz.)

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