The Allelopathic Activity of Aqueous Extracts of <i>Helianthus annuus</i> L., Grown in Boreal Conditions, on Germination, Development, and Physiological Indices of <i>Pisum sativum</i> L.

Evaluation of the allelopathy relationship between different crops is a sensible strategy fallowing the correct use of positive effects and to avoid the disadvantageous effects among plants. This study aimed to detect the allelopathic effect of aqueous extracts of sunflower (Helianthus annuus L.), grown in a boreal climatic zone, on the growth, subsequent development, and physiological traits of pea (Pisum sativum L.). Three factors have been studied: donor plant fertilization (unfertilized and fertilized), aqueous extracts from donor plant organs (leaves and stems (L+S), heads (H) and roots (R)); four concentrations of extracts (0%, 25%, 50% and 75%). The aqueous extracts from fertilized sunflower donor plant at 25% and 50% concentration acted as potential biostimulants that stimulated pea seed germination (SG), whereas L+S and R extracts at 75% concentration from unfertilized donor plant inhibited SG, at 4 days after sowing. The aqueous extracts demonstrated a stimulating effect on above-ground and root dry mass, compared to the control. The concentration of extracts demonstrated a significant inhibitory effect on SPAD. R extract revealed the strongest allelopathic effect on physiological traits of pea. L+S and H extracts at 25% concentration had stimulating effects, while 50% and 75% concentrations showed inhibiting effects on the photosynthetic rate. The water use efficiency, stomatal conductance, and stomatal limitation were inhibited, whereas, the transpiration rate, photosynthetic water use efficiency and intercellular CO2 concentration were stimulated, with an increasing of extract concentrations, comparatively to the control

Comparison of Productivity and Physiological Traits of Faba Bean (Vicia faba L.) Varieties under Conditions of Boreal Climatic Zone

This study aimed to evaluate and compare the physiological traits, productivity, and seed quality of nine faba bean varieties grown in a field trial under the Boreal climate conditions. A two-factor field experiment was laid out in a split-plot design: The seeds in the main plots were sown and treated with seed fungicide (SF) and untreated (without SF) (factor A). The sub-plots were assigned to nine varieties (factor B). The physiological traits of faba bean significantly varied among the varieties, and the behavior of faba bean varieties differed between the two growing seasons. The values of physiological traits for varieties Julia and Boxer significantly surpassed the trial mean under wet conditions, while the trait values for Fuego and Bioro were surpassed under conditions of a lack of moisture. Fungicidal seed treatment had a negligible effect on the physiological traits, while it had a significant negative influence on the leaf area index at the beginning of the flowering stage. SF had a noticeable effect on seed yield only for the varieties Nida DS and Fuego. The findings of the study revealed that Fuego and Isabell were the most suitable faba bean varieties for cultivation in the Boreal climate zone as they were distinguished from the other tested ones by the highest seed yields

Comparative response of spring and winter triticale productivity and bioethanol yield to fertilisation intensity

Grains of triticale are one of the feedstocks suitable for bioethanol production because they are characterised by high starch and low protein contents. In the present study, spring and winter triticale were comparatively studied to evaluate the influence of N fertilisation intensity on the productivity and bioethanol yield, as well as to assess the relationship between the meteorological factors and ethanol yield. Six treatments of N – 0, 60, 90, 120, 150, and 180 kg ha−1 were compared in spring triticale and in winter triticale crops. The analysis of variance showed that nitrogen level (factor A), year (factor B) and their interaction (A × B) significantly (P ≤ .01) influenced grain yield, starch yield and bioethanol yield of both spring and winter triticale. Fertilisation was the main factor explaining 47.6% and 41.0% of the total variability of bioethanol yield of spring and winter triticale, respectively. Nitrogen fertiliser rates 120–180 kg ha−1 resulted in maximum bioethanol yield of spring triticale (2417–2480 l ha−1) and winter triticale (4311–4420 l ha−1). Bioethanol conversion efficiency of nitrogen-fertilised spring and winter triticale was similar 492 l t−1 and 508 l −1, respectively. Meteorological factors had a greater impact on grain productivity and bioethanol yield for winter triticale than for spring triticale. Both seasonal types of triticale could be good feedstocks for bioethanol production in the areas with congenial weather conditions for their cultivation