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weed seed bank management

Weed seed bank management

Rotation = oat – pea – wheat – canola
Non PFP = in-crop herbicide used
Std PFP = no in-crop herbicide used
CC = Chaff Cart all years
Disturbance = heavy harrows in the fall in the canola crop
Intensive = intensive management of weeds after the PFP crop in the pea crop, using chaff cart, disturbance, and trifluralin application prior to the pea crop

For some crops, harvest losses can be significant and resulting volunteer crops can be weed problems in future crops. For example, Gulden et al. (2003) found that the harvest losses of canola ranged from 9 to 55 times the normal canola seeding rate! Setting harvest equipment to minimize harvest losses is important.

One approach to reducing weed pressure over the years involves reducing the number of weed seeds in the soil. This practice only works with weed species that are said to be seed-limited, such as wild oat. These species typically produce seeds that do not remain viable in the soil for extended periods of time. Many annual weed species are not seed-limited; seeds may persist in the seed bank for many years or even decades, making it impossible to manipulate the seedbank with agronomic practices.

Pre-seed wild oats (plants/m 2 )

Recommendations

Weed seedbank depletion is generally accomplished by stimulating weed germination and emergence and then destroying weeds that have emerged. Preventing weed seeds from entering the seedbank can also be effective.

In a Manitoba study, the use of shallow disturbance with rotary harrows increased wild oat germination prior to planting in a direct seeded system (Table 1). Nitrogen fertilizer application in spring had no significant effect on wild oat germination. Although soil disturbance increased wild oat germination, post seeding weed emergence and weed biomass were not reduced (Gillespie, 2006). Although weed seedbank depletion had no effect on weed pressure in this study, long-term use of soil disturbance for seedbank depletion could potentially show positive results.

See also  kubbie kush seeds

After allowing weeds to grow for a short time, these weeds must be destroyed, usually with a tillage operation or application of a herbicide. (See section on Stale Seedbed in Spring Tillage)

Keeping the weed seeds out

Spring N fertilizer application

Stimulating weed germination and then destroying weeds can deplete the weed seed bank of certain species over a number of years.

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Date and time: Fri, 14 Jan 2022 06:51:13 GMT