May 17, 2007 – Author: Christy Sprague, Michigan State University Extension, Department of Crop & Clay Sciences
Editor’s note: This commodity is from the athenaeum of the MSU Crop Advisory Team Alerts. Check the characterization of any pesticide referenced to ensure your use is included.
Crop circling and replant restrictions for herbicides are acutely important to chase above-mentioned to planting. One of the adapted characteristics of an herbicide can about be balance action for edger control. However, this appropriate can additionally account some headaches if the circling restrictions are not followed. Herbicides charge acceptable time to blow or breakdown above-mentioned to burying crops that are added affected to that herbicide. For example, 1 pt/A of 2,4-D ester can be an acutely admired apparatus for burndown applications above-mentioned to burying soybeans. However, for this appliance to be safe to soybeans, 2,4-D ester needs to be activated seven canicule above-mentioned to burying soybeans. The brake or canicule to burying is best for college ante of 2,4-D ester and alike altered formulations (amine formulations) of 2,4-D. The brake is 15 canicule amid an appliance of 1 pt/A of 2,4-D amine and soybean burying and is as abundant as 30 canicule if the appliance bulk is college than 1 pt/A.
There are several factors that access the amusement of an herbicide in the soil. These factors include: the herbicide’s adeptness to abide in the soil, the bulk of condensate or clay damp accessible for degradation, clay temperature and clay pH. Although these factors all access herbicide persistence, assertive factors are added important than others for specific herbicide chemistries.
First of all, it is consistently important to apperceive what articles were activated in the field, how continued these articles abide and what rotational crops are acute to clay residues. Altered herbicides abide in the clay altered lengths of time. It is important to apperceive back a artefact was activated to actuate the time the artefact has been accessible for degradation. For example, the atrazine characterization indicates that soybeans can be buried the afterward year, if applications were fabricated afore June 10 of the antecedent year. This rotational brake was fabricated to ensure that there was acceptable time for atrazine to abase amid appliance and soybean burying the afterward year.
Other factors to accede accommodate the bulk of precipitation accustomed afterward appliance and clay temperatures. Dry clay altitude about abate the bulk of herbicide degradation. Clay damp is acutely important, abnormally during the aboriginal two to four weeks afterwards application. If condensate and clay damp are not sufficient, amusement of the herbicide will best acceptable be reduced, ultimately accretion the abeyant botheration for the afterward crop. Additionally, abridgement of clay damp can aftereffect in added herbicide adsorption to clay particles and amoebic matter, abbreviation herbicide availability for degradation. Clay temperature additionally plays an important role in herbicide degradation. Colder clay temperatures can abatement herbicide degradation. That is why assertive herbicides are not acclimated in Michigan.
Soil pH affects the chain and abasement of abounding herbicides. In particular, aerial clay pH (above 7.0) reduces the amusement of atrazine and simazine. Also, amusement of chlorimuron-containing articles (Classic, Canopy, Canopy EX, and Synchrony XP) is bargain if the clay pH is greater than 7.0, accretion the likelihood of persistence. Clomazone (Command) amusement is bargain by clay pH levels beneath than or according to 5.9, accretion the affairs of aftereffect to blah the afterward year.
To abstain problems due to herbicide carryover, it is consistently important to chase the crop circling restrictions that are begin on the herbicide label. Additionally, this advice can be begin and is abbreviated in Table 12 of the 2007 Edger Ascendancy Guide for Acreage Crops. If you are still anxious about the abeyant for carryover, acreage or greenhouse bioassays can be conducted to advice actuate abeyant aftereffect problems. These bioassays are about bargain and will advice appraisal the abeyant for rotational crop abrasion from herbicide residues.
Dr. Sprague’s assignment is adjourned in allotment by MSU’s AgBioResearch.
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