Biological Parameters for Germination of Selected Summer Weed Species: First Step to Transfer the Hydrothermal Model Alertinf to Croatia

Valentina Šoštarčić; Roberta Masin; Donato Loddo; Ema Brijačak; Maja Šćepanović

doi:10.20944/preprints202101.0165.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 6 January 2021 / Approved: 8 January 2021 / Online: 8 January 2021 (14:12:28 CET)

The efficacy of weed management depends on the correct control timing according to the seedling emergence dynamics. Since soil temperature and soil moisture are two main factors that determine weed germination, the hydrothermal time model can be used to predict their emergence. The aim of this study was to estimate the base temperature (Tb) and base water potential (Ψb) for germination of Chenopodium album, Amaranthus retroflexus, Setaria pumila and Panicum capillare collected from fields in continental Croatia and then to compare these values with those of Italian populations embedded in the AlertInf model. Germination tests were performed at seven constant temperatures (ranging from 4 to 27°C) and eight water potentials (0.00 to - 1.00 MPa). Estimated Tb and Ψb were 3.4°C, -1.38 MPa for C. album, 13.9°C, -0.36 MPa for A. retroflexus, 6.6°C, -0.71 MPa for S. pumila and 11.0°C, -0.87 MPa for P. capillare, respectively. According to the criterion of overlap of the 95% confidence intervals, only Tb of C. album, and Ψb of A. retroflexus were similar between Croatian and Italian populations. Further field experiments should be conducted in the Croatian field to monitor weed emergence patterns of C. album and to calibrate the AlerInf equation parameters.

base temperature; base water potential; predictive weed emergence model; weed germination

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Biological Parameters for Germination of Selected Summer Weed Species: First Step to Transfer the Hydrothermal Model Alertinf to Croatia

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