Find more information in this table containing different herbicides for lambsquarters management. Many pre-emergent, post-emergent, and dual action (pre- and post activity) herbicides can be very effective in controlling lambsquarters when they are still small. Like marestail or pigweed species, lambsquarters is extremely prolific with an average adult plant producing 70,000 seeds or more, making seed bank management a priority when dealing with heavy lambsquarters pressure in your fields. It is highly competitive and tolerant to dry/saline soil conditions. This weed is readily identified by its toothed, triangular leaves, white grainy texture on younger leaves, and densely-packed flower clusters. Lambsquarters occupies the same botanical family as beets, spinach, and swiss chard, as well as the same genus as quinoa. Your goal is to make sure as much of the N you apply as possible actually makes it into the soil (rather than being lost to the atmosphere) to be available when the crop needs it.Ĭommon lambsquarters ( Chenopodium album) is an early-emerging summer annual weed in the Amaranth family. When moisture limits crop growth it will also limit nutrient demand. Finally, remember that any source of available N (and other nutrients) must get into the soil and dissolve in soil moisture to be available to your crop.Consider including a urease inhibitor or injecting into the soil (as equipment allows). Liquid urea ammonium nitrate (UAN) has reduced risk due to lower urea content but is still susceptible to losses when surface applied. Nitrate-containing granular N fertilizers have low risk. You may also consider other N sources with lower risk of ammonia volatilization than urea.However, they will also release nitrogen (N) slower than urea once moisture arrives (with pros and cons). Polymer coated ureas (e.g., ESN and others) will also protect against volatilization losses when surface applied, potentially for a longer period than a urease inhibitor, due to physical protection and limited availability without moisture.When the extended forecast is dry, delaying your application can be a good idea to increase the chance of catching rain within that timeframe. It is generally only effective for seven to 14 days. Keep in mind the inhibitor will break down over time. If irrigation isn’t available (and rain isn’t imminent), coating urea with a urease inhibitor like NBPT (Agrotain, N-Dure and other trade names) is a must to reduce volatilization risk.When broadcasting without tillage, 0.3-0.5 inches of rain or irrigation are generally needed. Tillage usually does the job well if incorporated to at least a 3-inch depth (and into moisture). Urea needs to get into the soil to avoid significant volatilization losses.Here are a few notes to protect your investment: With dry soils and very little rain in the extended forecast, volatilization losses from surface-applied urea fertilizers is a concern. Medium range guidance calls for near normal mean temperatures and precipitation totals next week, but a return to warmer and drier than normal weather again by the third week in June.Ĭheck out the asparagus section below and the Michigan State University Extension article, " Dry forecast: How will that impact weed control?" about the impacts of this weather on herbicides.Potential evapotranspiration rates will continue at elevated levels through next week (approximately 0.20 inches per day).Low temperatures in the 40s to the low 50s through Friday warming to the 50s this weekend. High temperatures gradually warming from the low and mid-70s Wednesday, June 7, to the upper 70s and low 80s by Saturday.Scattered showers and thundershowers possible Saturday and Sunday.Continued fair and dry through Friday, June 9.
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