Estimation du stock semencier d'un sol laboure ou en semis direct

Zanin, Giuseppe; Berti, Antonio; Zuin, M. C.

doi:10.1111/j.1365-3180.1989.tb01312.x

Cited by 26 publications

(8 citation statements)

References 5 publications

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“…The 25 individual cores were arranged singly on plastic trays. Seedlings were identified weekly and counted according to the seedling emergence method (Zanin et al. , 1989; Otto et al.…”

Section: Methodsmentioning

confidence: 99%

Evaluating weed diversity with indices of varying complexity in north‐eastern Italy

et al. 2012

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Weed diversity is one of the focuses of attention of researchers, and it can be evaluated with different indices, mainly based on species richness and community evenness. In intensive cropping systems, much of the diversity is concentrated in semi-natural areas in the neighbouring habitats of arable fields. This study assessed weed diversity for seedbank and vegetation in an organically farmed valley in north-eastern Italy. Assessment was carried out with indices based on species abundance, together with Rényi diversity that also considers abundance distribution and Rao’s quadratic entropy, which considers dissimilarity between species. A complete quadratic entropy approach for weeds is described. It is known that landscape context may affect community structure, and as an example of application of diversity indices in weed research, the correlation with the surrounding landscape complexity was evaluated. Results show that a community can be relatively balanced with even just a few species. With diversity indices based on species abundance only, it is therefore difficult to quantify balance. The Rényi diversity can overcome this limit, and the quadratic entropy can isolate extreme communities. In conclusion, the diversity of a weed community can be better evaluated using more diversity indexes, and the quadratic entropy can provide new criteria for ranking the diversity and combine a number of traits into a single numerical descriptor. The correlation between landscape complexity and weed diversity is low but confirms that agro-environmental schemes should consider the management of fields and landscape together

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“…The 25 individual cores were arranged singly on plastic trays. Seedlings were identified weekly and counted according to the seedling emergence method (Zanin et al. , 1989; Otto et al.…”

Section: Methodsmentioning

confidence: 99%

Evaluating weed diversity with indices of varying complexity in north‐eastern Italy

et al. 2012

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“…For the 1996 soil samples, seedbank evaluation was done according to the seedling emergence method (Zanin et al. , 1989).…”

Section: Methodsmentioning

confidence: 99%

A modelling approach using seedbank and soil properties to predict the relative weed density in organic fields of an Italian pre‐alpine valley

et al. 2007

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In 1996, a study was conducted on the seedbanks of a pre-alpine valley in northern Italy which had been organically farmed since 1986. The seedbanks were evaluated using soil cores taken from 16 organic fields located at various altitudes and seed numbers were determined using the Ôseedling emergence methodÕ. Thirteen soil properties were also evaluated. In 2003, the germinable seedbank was assessed in five other fields chosen at random. Soil properties were evaluated by the same method as in 1996. Using the data of the first 16 fields as the analysis data set and those of the latter five as an independent validation data set, a quadratic weed seedbank-soil properties model was built with partial least square regression analysis. The model estimates the relative abundance of the various species as the sum of the contribution of individual soil properties and has a high predictive capacity. With a novel graphic approach, it is possible to describe the nonlinear relationship between each soil property and weed species relative abundance, giving a rational, quantitative, explanation as to why some species are widespread (e.g. Chenopodium album, Galinsoga parviflora and Chenopodium polyspermum), whereas others tend to concentrate in specific fields (e.g. Spergula arvensis). The approach can, when some hypotheses hold, give a rational basis for the explanation of the relative abundance of species in a weed community and constitutes a useful methodology for study and research.

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“…Samples were kept in a non‐heated glasshouse for 12 months, starting from 9 April 1997. To favour dormancy breakage, sub‐irrigation was suspended every 4 months for a period of 15 d, after which soil samples were stirred (Zanin et al ., 1989). One month before the end of the experiment, samples were treated with a 1000‐mg L –1 solution of KNO 3 to stimulate the germination of residual viable seeds.…”

Section: Methodsmentioning

confidence: 99%

Long‐term tillage and crop rotation effects on weed seedbank size and composition

Bàrberi¹,

Cascio²

2001

Weed Research

191

135

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Size and composition of the weed seedbank was assessed after 12 years of application of four tillage systems in two crop rotations. Mouldboard and chisel ploughing at 45 cm, minimum tillage at 15 cm and no tillage were compared in continuous winter wheat and a pigeon bean/winter wheat 2‐year rotation. Weed control was based upon post‐emergence herbicide application. Weed seedling emergence from soil samples taken at 0–15, 15–30 and 30–45 cm depths was assessed in a non‐heated glasshouse for 12 months. The tillage system influenced weed seedbank size and composition to a much greater extent than crop rotation. Total weed seedling density was higher in no tillage, minimum tillage and chisel ploughing plots in the 0–15, 15–30 and 30–45 cm layers respectively. Density in the whole (0–45 cm) layer did not differ significantly among tillage systems. With no tillage, more than 60% of the total seedlings emerged from the surface layer, compared with an average 43% in the other tillage systems. Crop rotation did not influence either weed seedbank size or seedling distribution among soil layers, and only had a small influence on major species abundance. The weed seedbank was dominated (>66%) by Conyza canadensis (L.) Cronq. and Amaranthus retroflexus (L.), which thrived in chisel ploughing and no tillage respectively. Results suggested that crop rotation and substitution of mouldboard ploughing by non‐inversion tillage (especially by minimum tillage) would not result in increased weed problems, whereas use of no tillage might increase weed infestations because of higher seedling recruitment from the topsoil.

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Estimation du stock semencier d'un sol laboure ou en semis direct

Cited by 26 publications

References 5 publications

Evaluating weed diversity with indices of varying complexity in north‐eastern Italy

Evaluating weed diversity with indices of varying complexity in north‐eastern Italy

A modelling approach using seedbank and soil properties to predict the relative weed density in organic fields of an Italian pre‐alpine valley

Long‐term tillage and crop rotation effects on weed seedbank size and composition

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