Morphological and physiological changes in barley cultivars under black oat competition

Leandro Galon,André Andres,Felipe Nonemacher,Fábio Schreiber,Germani Concenço,Luciane R Agazzi

doi:10.51694/advweedsci/2021;39:000014

Abstract

Background Weeds compete with crops, demanding efficient control to avoid yield losses. Highly competitive cultivars are a cultural method that can increase weed suppression and reduce the effects of crop-weed competition. Objective The present study aimed to assess the competitive abilities of barley cultivars (crop) against black oat (weed) and their interference in crop physiology. Methods A preliminary additive experiment was carried out with increasing densities of barley and black oat to determine the minimal density from where there [...]

Highlights

Barley is the fourth most cultivated cereal worldwide and it is widely used for livestock feed, human food, and malt production (Cuesta-Seijo et al, 2016)
The experimental units were composed of plastic pots, with a capacity of 8 dm-3, filled with soil from an agricultural area that was classified as Humic Aluminoferric Red Latosol (Embrapa, 2013)
The physiological parameters were discussed with due caution since they represented point assessments made with the infrared gas analyzer (IRGA) equipment, which reflected the physiological status of the plant at the moment of the evaluation

Summary

Introduction

Barley is the fourth most cultivated cereal worldwide and it is widely used for livestock feed, human food, and malt production (Cuesta-Seijo et al, 2016). In Brazil, the Rio Grande do Sul (RS) State is the main producer, with approximately 30% of the domestic barley production and an average grain yield of 2.595 kg ha-1 (Conab, 2021). Inadequate rains, such as the dry harvest and frosts are unfavorable for the yield and quality of barley (Tavares et al, 2015), including weeds that reduce the productive potential of the crop (Nunes et al, 2007). BRS Cauê was the cultivar that performed better against black oat, with an increase in the overall photosynthetic rate, due to a smaller leaf area loss, as the competition increased. Conclusions: BRS Cauê was the most competitive cultivar, suffering the lowest impact of competition with black oat

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Methods

Results

Conclusion