e-journal

Weed seed decay in conventional and diversified cropping systems

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Diversified cropping systems can have high soil microbial biomass and thus strong potential to reduce the
weed seedbank through seed decay. This study, conducted in Iowa, USA, evaluated the hypothesis that weed seed decay is higher in a diversified 4-year maize–soyabean–oat/lucerne–lucerne cropping system than in a conventional 2-year maize–soyabean rotation. Mesh bags filled with either Setaria faberi or Abutilon theophrasti seeds and soil were buried at two depths in the maize phase of the two cropping systems and sampled over a 3-year period. Setaria faberi seed decay was consistently greater at 2 cm than at 20 cm
burial depth and was higher in the more diverse rotation than in the conventional rotation in 1 year. Abutilon theophrasti seeds decayed very little in comparison with seeds of S. faberi. Separate laboratory and field experiments confirmed differences in germination and seed decay among the seed lots evaluated each year. Fusarium, Pythium, Alternaria, Cladosporium and Trichoderma were the most abundant genera colonising
seeds of both species. A glasshouse experiment determined a relationship between Pythium ultimum and
S. faberi seed decay. Possible differences in seed susceptibility to decay indicate the need to evaluate
weed seedbank dynamics in different cropping systems when evaluating overall population dynamics and formulating weed management strategies.

Keywords: weed management, seedbank, Setaria faberi,giant foxtail, Abutilon theophrasti, diversified crop
rotations, soil microorganisms, seed pathogens, organic matter.

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Informasi Detail

Judul Seri

Weed Research

No. Panggil

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Penerbit

: European Weed Research Society., 2014

Deskripsi Fisik

Weed Research 54, 13–25.

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

PERTANIAN.

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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