Comments on herbicide carryover potential

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article

Due to the widespread drought conditions experienced over the past year, many growers are concerned about the potential for herbicide carryover injury to this year's crops.

The potential for herbicide carryover injury is driven by two main factors:

• Concentration of available herbicide remaining in the soil at the time of rotational crop planting. This depends on herbicide chemical properties, soil characteristics, and weather.

• Susceptibility of the rotational crop to the herbicide. Some crops are not injured by relatively high concentrations and other crops are highly injured by low concentrations. The stresses that the newly planted crop faces during establishment can also affect response. Emerging plants are more likely to show injury to residual levels of herbicide if other stresses such as compaction or cold, wet soils are also present.

There is little that growers can do at this point to affect the amount of residual herbicide present in their fields.

However, there are a few things that can be done to reduce the risk of crop injury.

• Review spray records for each field and product labels to see what restrictions are indicated. Many labels specify the time required between herbicide application and planting of a rotational crop. Planting sooner than the specified time increases the risk of injury.

• Ensure seedling stresses are minimized. This gives the young plants their best chance of surviving herbicide residues with little damage. This can include making sure soil pH and fertility levels are optimum for the crop, reducing compaction, and avoiding planting into cold, wet soils.

• Change planned crop. In some cases it may be best to plant the same crop as the previous year, or at least a crop for which last year's herbicides are also labeled. This significant step has the most potential to reduce the risk of crop injury.

• Delay planting. Growers could plant suspect fields last to give more time for the degradation to occur.

• Consider tillage. Tillage may dilute the herbicide in the soil profile and provide aeration and faster soil warming to stimulate microbes, but results are mixed on whether this will provide a significant benefit.

• Conduct a bioassay or chemical analysis. It is important to note that carryover injury is impacted by many factors besides just how much herbicide is present.

Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...

Comments (0) Leave a comment 

e-Mail (required)


characters left

Portable Conveyors

Convey-all portable conveyors are designed to handle your crops gently and efficiently. We offer an extensive line of high capacity ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form