Influence of soil moisture on the safening effect of CGA-43089 in grain sorghum (Sorghum bicolor)

Ketchersid, M.L. and Norton, K. and Merkle, M.G. (1981) Influence of soil moisture on the safening effect of CGA-43089 in grain sorghum (Sorghum bicolor). Weed Science, 29 (3). pp. 281-287.

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The influence of surface soil moisture on the phytotoxicity of alachlor and metolachlor to grain sorghum cv. Funk 623 GBR, treated or not treated with CGA 43 089 (cyometrinil), was examined in the field and in a controlled environment. In the field, grain sorghum with or without cyometrinil was not injured by alachlor or metolachlor provided that the surface soil remained dry until crop emergence. When the soil surface was moist, cyometrinil was necessary to protect sorghum from alachlor and metolachlor at 2.24 and 3.36 kg/ha. In a controlled environment, cyometrinil was less effective in protecting sorghum from herbicide injury when Ships clay was continuously wet (110% field capacity) from time of sowing to emergence (3 to 5 days) than when soil was wet for only 1 or 2 days prior to emergence. In contrast, if the surface soil remained dry until the coleoptile reached the soil surface, alachlor and metolachlor had little effect on sorghum even when no protectant was present. When sorghum was sown in Arenosa sand containing 5% OM, protected sorghum grew as well as a control even under continuous high moisture conditions. Metolachlor incorporated into the root zone at a concn. of 20 p.p.m. had no effect on either protected or unprotected sorghum. Alachlor and metolachlor were most phytotoxic when placed in the surface 1.25 cm of moist soil or when incorporated. This suggests that the coleoptile is the most susceptible part of the plant

Item Type: Article
Author Affiliation: Texas Agricultural Experiment Station, Texas A & M University, College Station, TX 77843, USA
Subjects: Plant Protection
Environmental Science
Divisions: Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 08 Feb 2013 05:15
Last Modified: 08 Feb 2013 05:15

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