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Number of results: 5
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Abstract

From 2009 to 2018, a total of 80 wheat crops were studied at plot and regional scales to predict stripe rust epidemics based on influential climatic indicators in Kermanshah province, Iran. Disease onset time and epidemic intensity varied spatially and temporarily. The disease epidemic variable was classified as having experienced nonepidemic, moderate or severe epidemics to be used for statistical analysis. Principal component analysis (PCA) was used to identify climatic variables associated with occurrence and intensity of stripe rust epidemics. Two principal factors accounting for 70% of the total variance indicated association of stripe rust epidemic occurrence with the number of icy days with minimum temperatures below 0°C (for subtropical regions) and below −10°C (for cool temperate and semi-arid regions). Disease epidemic intensity was linked to the number of rainy days, the number of days with minimum temperatures within the range of 7−8°C and relative humidity (RH) above 60%, and the number of periods involving consecutive days with minimum temperature within the range of 6−9°C and RH% > 60% during a 240-day period, from September 23 to May 21. Among mean monthly minimum temperatures and maximum relative humidity examined, mean maximum relative humidity for Aban (from October 23 to November 21) and mean minimum temperature for Esfand (from February 20 to March 20) indicated higher contributions to stripe rust epidemic development. Confirming PCA results, a multivariate logit ordinal model was developed to predict severe disease epidemics. The findings of this study improved our understanding of the combined interactions between air temperature, relative humidity, rainfall, and wheat stripe rust development over a three-season period of autumn-winter-spring.

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Authors and Affiliations

Bita Naseri
Farhad Sharifi
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Abstract

Field research was conducted at Siedlce University of Natural Sciences and Humanities in 2019–2021. The objective was to determine the effects of bacterial formulations and cover crops on the biomass, number and species composition of dominating weeds prior to spring barley harvest. The field trial involved two factors: A – bacterial formulations: I – control, II – nitrogen-fixing bacteria ( Azospirillum lipoferum Br17, Azotobacter chroococcum), III – nitrogen-fixing bacteria ( Azospirillum lipoferum Br17, Azotobacter chroococcum) + phosphorus-solubilizing bacteria ( Bacillus megaterium var, phosphaticum, Arthrobacter agilis), IV – nitrogen-fixing bacteria ( Azotobacter chroococcum) + plant growth-promoting rhizobacteria (PGPR) ( Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas fluorescens); B – cover crops: control without a cover crop, red clover, red clover + Italian ryegrass, Italian ryegrass. Spring barley was harvested in late July. Weed samples were collected just before harvest to determine the fresh and dry matter of weeds as well as their number and species composition. The research demonstrated conclusively that an application of bacterial products combined with cover crops contributed to a significant reduction in the weight and number of weeds including dominating species such as Chenopodium album, Sinapis arvensis, Tripleurospermum inodorum and Elymus repens. Superior weed control was achieved in spring barley grown in combination with Azotobacter chroococcum + PGPR and a mixture of red clover and Italian ryegrass as a cover crop.
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Authors and Affiliations

Anna Płaza
1
Alicja Niewiadomska
2
Rafał Górski
3
Robert Rosa
1

  1. Institute of Agriculture and Horticulture, Faculty of Agrobioengineering and Animal Husbandry, Siedlce University of Natural Sciences and Humanities, Siedlce, Poland
  2. Department of Soil Science and Microbiology, Poznań University of Life Sciences, Poznań, Poland
  3. Faculty of Engineering and Economics, Ignacy Mościcki University of Applied Sciences in Ciechanów, Ciechanów, Poland
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Abstract

Cereal cyst nematodes (Heterodera spp.) are distributed globally and cause severe production losses of small grain cereals. To investigate the occurrence of cereal cyst nematodes in wheat-growing areas of Algeria, a survey was conducted and 27 cereal cyst nematode populations were collected. The populations were initially identified based on their morphological and morphometric characters, followed by molecular methods using speciesspecific primers, complemented by ITS-rDNA sequences. The morphological and morphometric features of second-stage juveniles (J2s) and cysts supported the presence of three Heterodera species: H. avenae, H. filipjevi and H. hordecalis. All morphological values of these distinct populations were very similar to those previously described for these species. Using species-specific primers for H. avenae and H. filipjevi, the specific bands of 109 bp and 646 bp confirmed the morphological identification of both species, respectively. In addition, the internal transcribed spacer (ITS) regions were sequenced to study the diversity of the 27 populations. These sequences were compared with those of Heterodera species available in the GenBank database (www.ncbi.nlm.nih.gov) and re-confirmed the identity of the species. Nineteen sequences of ITS-rDNA were similar (99–100%) to the sequences of H. avenae published in the GenBank, six sequences were similar (99–100%) to H. hordecalis, and two were similar (98–99%) to H. filipjevi. The results of this study are of great value to breeding programs and extension services, where they will contribute to the design of control measures to keep damaging nematodes in check.

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Authors and Affiliations

Djamel Smaha
Fouad Mokrini
Mustafa İmren
Aissa Mokabli
Abdelfattah A. Dababat
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Abstract

The author highly appreciates the fi rst issue of the third volume of the fundamental “Dictionary of folk stereotypes and symbols” (ed. prof. E. Bartminsky), dedicated to the symbolism of plants. This issue presents rich materials (language, folklore, ethnographic) related to cereals, which in the popular perception have a mythological interpretation, the daily bread is God’s gift, endowed with sacred significance.

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Authors and Affiliations

Светлана М. Толстая
ORCID: ORCID
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Abstract

Phytolith-occluded carbon (PhytOC) is highly stable, and constitutes an important source of long-term C storage in agrosystems. This stored carbon is resistant to the processes of oxidation of carbon compounds. In our research phytolith content in barley (Estonia) and oat (Poland) grain and straw was assessed at field trials, with Si as a liquid immune stimulant OPTYSIL and compost fertilisation. We showed that cereals can produce relatively high amounts of phytoliths. PhytOC plays a key role in carbon sequestration, particularly for poor, sandy Polish and Estonian soils. The phytolith content was always higher in straw than in grain regardless of the type of cereals. The phytolith content in oat grains varied from 18.46 to 21.28 mg∙g−1 DM, and in straw 27.89–38.97 mg∙g−1 DM. The phytolith content in barley grain ranged from 17.24 to 19.86 mg∙g−1 DM, and in straw from 22.06 to 49.08 mg∙g−1 DM. Our results suggest that oat ecosystems can absorb from 14.94 to 41.73 kg e-CO2∙ha−1 and barley absorb from 0.32 to 1.60 kg e-CO2∙ha−1. The accumulation rate of PhytOC can be increased 3-fold in Polish conditions through foliar application of silicon, and 5-fold in Estonian conditions. In parallel, the compost fertilisation increased the phytolith content in cereals.
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Authors and Affiliations

Beata Rutkowska
1
ORCID: ORCID
Peter Schröder
2
ORCID: ORCID
Michel Mench
3 4
ORCID: ORCID
Francois Rineau
5
ORCID: ORCID
Witold Szulc
6
ORCID: ORCID
Wiesław Szulc
1
ORCID: ORCID
Jarosław Pobereżny
7
ORCID: ORCID
Kristjan Tiideberg
8
ORCID: ORCID
Tomasz Niedziński
1
ORCID: ORCID
Evelin Loit
8
ORCID: ORCID

  1. Warsaw University of Life Sciences – SGGW, Institute of Agriculture, Nowoursynowska St, 166, 02-787 Warsaw, Poland
  2. Helmholtz Center for Environmental Health, German Research Center for Environmental Health, Research Unit Environmental Simulation, Ingolstädter Landstraße 1, D-85764 Neuherberg, Munich, Germany
  3. University of Bordeaux, Amphithéâtre 3 à 12, 33000, Bordeaux, France
  4. INRAE – National Research Institute for Agriculture, Food and the Environment, 147 rue de l’Université 75338, Paris, France
  5. Hasselt University, Martelarenlaan 42, 3500, Hasselt, Belgium
  6. Fire University, Słowackiego St, 52/54, 01-629 Warsaw, Poland
  7. University of Science and Technology, Kaliskiego Ave., 7, 85-796 Bydgoszcz, Poland
  8. Estonian University of Life Sciences, Institute of Agricultural and Environmental Sciences, Fr. R. Kreutzwaldi 1, 51006, Tartu, Estonia

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