Author(s)

José Maria Barbat Parfitt¹, André Andres¹, Germani Concenço¹, Gustavo Mack Teló¹, Fábio Schreiber¹, Jaqueline Trombetta da Silva², Ivana Santos Moisinho³, Pâmela Andrades Timm³

¹Sustainable Crop Management, Crop Management, Embrapa Clima Temperado, Pelotas, Brazil.
²Federal University of Pelotas (UFPel), Pelotas, Brazil.
³Federal University of Pelotas (UFPel) and Sustainable Crop Management, Embrapa Clima Temperado, Pelotas, Brazil.

The present work aimed to evaluate the effect of different water stress levels on the development of both rice and barnyardgrass. The study was established into greenhouse, in completely randomized design, in factorial scheme 2 × 5, with four replications. Factor “A” comprised the plant species (rice cv. BRS Querência, or the weed Echinochloa crusgalli), and factor “B” comprised the water stress levels: (T1) continuous flood (CF); (T2) 0 kPa (saturated soil); (T3) 10 kPa; (T4) 40 kPa; and (T5) 100 kPa. Plant emergence was assessed every day; plant length was measured 30 days after planting. At the end of the experiment, the number of leaves per plant, root length and shoot and root dry mass were determined. Our data supply evidence that under moderate water stress, up to approximately 40 kPa, rice tends to perform better than barnyardgrass in the initial stage of crop growth, when under equivalent plant density. However, barnyardgrass is usually present in much higher plant density than crop plants in fields traditionally cropped with rice. Thus, efficient control of barnyardgrass should be accomplished to avoid damage to rice crop by competition for environmental resources.

Echinochloa crusgalli, Intermittent Irrigation, Oryza sativa

Barbat Parfitt, J. , Andres, A. , Concenço, G. , Teló, G. , Schreiber, F. , da Silva, J. , Moisinho, I. and Timm, P. (2017) Rice and Barnyardgrass: Water Stress and Initial Establishment. American Journal of Plant Sciences, 8, 3110-3119. doi: 10.4236/ajps.2017.812210.