EFFECT OF SPRAY VOLUME AND PRESSURE ON POSTEMERGENCE JOHNSONGRASS (SORGHUM-HALEPENSE) CONTROL

Citation
Cg. Mcwhorter et Je. Hanks, EFFECT OF SPRAY VOLUME AND PRESSURE ON POSTEMERGENCE JOHNSONGRASS (SORGHUM-HALEPENSE) CONTROL, Weed technology, 7(2), 1993, pp. 304-310
Citations number
NO
Categorie Soggetti
Agriculture,"Plant Sciences
Journal title
ISSN journal
0890037X
Volume
7
Issue
2
Year of publication
1993
Pages
304 - 310
Database
ISI
SICI code
0890-037X(1993)7:2<304:EOSVAP>2.0.ZU;2-B
Abstract
Fenoxaprop, fluazifop/fluazifop-P, haloxyfop, and quizalofop at 0.14 k g ai ha-1 and sethoxydim at 0.28 kg ai ha-1 were applied broadcast ove r-the-top in spray volumes of 94 and 374 L ha-1, each at 138 and 345 k Pa, to control johnsongrass in soybeans over a 5-yr period. The two sp ray volumes provided equal control, but control was better when treatm ents were applied at 345 kPa than at 138 kPa. There were no significan t interactions among herbicides, spray volumes, or spray pressures. Mo st of the spray was deposited on the upper surface of the plant canopy . Less than 10% of the herbicide spray applied penetrated into the can opy onto water-sensitive spray cards located 10, 20, 30, or 40 cm abov e the ground.