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Investigations over three years studied the relationship between weed seeds in the soil seedbank and the resultant populations of broadleaf weeds in maize fields. Plots were protected from pre-emergence herbicide, after which soil samples (100 mm) were collected and weed seeds therein enumerated. Emerged weed seedlings in field plots were counted over the following 8 weeks. Up to 67 broadleaf weed species were identified, although not all were found at every site and some were specific to a region or soil type. On average 2.1–8.2% of the seed in the soil seedbank emerged. For most weeds strong linear relationships were noted between seedling numbers and the seed numbers in the soil, although for some, like white clover (Trifolium repens), only a weak relationship was observed. In the case of fathen (Chenopodium album), which had the largest seedbank, there was evidence of asymptotic behaviour with seedling emergence levelling off at high seed numbers.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Predicting broadleaf weed populations in maize from the soil seedbank