Matter-of-fact atrazine carry over was a concern when deciding to plant a 17 acre field, hopefully within the next month, with alfalfa, orchard grass and Barenburg Green Spirit Italian Rye grass as a cover crop. Application flexibility allows for AAtrex 4L to be applied preplant surface, preplant incorporated, pre-emergence, or post-emergence. Injury symptoms only occur after the cotyledons and first leaves emerge. Kentucky has had dry seasons in the past, yet atrazine injury to rotational crops was seldom an issue. If atrazine carryover is likely in a field, it may be best to plant corn (or sorghum) that year to avoid potential problems. Atrazine, Callisto™, Laudis™, and the 1x rate of Dual II Magnum™ did not affect any of the cover crop species relative to their controls. Having said that, the risk of crop injury due to atrazine carryover is still an issue that we need to consider on a case by case basis. It may be impregnated or applied in liquid fertilizer. Package Mix: Yes 2.7 lb/gal & 1.34 lb/gal Company Trade Name Common Name * Possibility of crop injury from atrazine carryover. Application Alfalfa Total Herbicide Time Rate Injury Yield Forage (%) (lb/A) (lb/A) Treflan PPI 1.5 pt 12 901 7535 Pursuit+NIS+N FP 1.44 oz 0 2707 3392 Raptor+NIS+N FP 4 oz 0 3038 3281 To meet the growing weed control challenges, new residual herbicide products (Group 4, 27 and 14) are popular for difficult to control weeds. The risk will be reduced if atrazine was applied early spring and had some rain to move into the soil profile. The adjuvant system must still be used when atrazine is in the tank, and MSO is the recommended surfactant for optimal weed control. All of the factors described above – herbicide characteristics, soil characteristics, weather conditions, and rotational crop planted – interact with each other to cause or avoid carryover injury. Atrazine and atrazine-containing products, which are used often on row crops, also can damage the alfalfa. A liquid formulation, AAtrex ® 4L provides season-long control of many broadleaf weeds and some grasses in approved crops. 15 months if more than 2 lb atrazine applied or dry summer. Interveinal chlorosis … Herbicides are available for pre-plant incorporated and post-emergence applications for weed and grass control in alfalfa. Herbicide half-life General Rule •Short - < 30 days ... •Atrazine: alfalfa = clovers > radish = ryegrass/timothy > hairy vetch = pea > oats > wheat = barley = rye •Mesotrione: clovers = alfalfa … e; If receive 15 inches of precipitation/year. Corn herbicides Pyroxasulfone (Zidua) and metolachlor (Dual, etc) can hinder annual ryegrass establishment. If the hay has legumes in it, it has not been treated with any of these herbicides. Corn and millet are tolerant to atrazine while other crops vary in susceptibility. For more than half a century, atrazine has been a mainstay of corn, sorghum and sugar cane farmers for its proven control of a broad range of destructive weeds. High soil pH (pH >7.0) will increase atrazine persistence. I recommend farmers apply herbicide … Atrazine Carryover • High pH (> 7.5) –Fewer H + available – Atrazine maintains neutral charge – Less adsorbtion to soil – More available to plant R. Hartzler. Atrazine, at as little as 0.5 lb AI/A, will improve the speed, spectrum and consistency of the weed control. Atrazine applied for weed control in corn results in residue the following year or for several years when applied at 1.5 to three pounds (active rate) per acre. Herbicide Carryover. The sensitivity of the rotational crop is another factor to consider. 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