American Journal of Plant Sciences (2017) 8, 3110-3119

José Maria Barbat Parfitt, André Andres, Germani Concenço, Gustavo Mack Teló, Fábio Schreiber, Jaqueline Trombetta da Silva, Ivana Santos Moisinho and Pâmela Andrades Timm (2017)
Rice and barnyardgrass: Water stress and initial establishment
American Journal of Plant Sciences 8 (12), 3110-3119
Abstract: 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Germani Concenço, André Andres

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
general biology - morphology - evolution

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Echinochloa crus-galli (weed)	Rice (Oryza)	Brazil (south)