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- Title
Modeling the Emergence of Echinochloa sp. in Flooded Rice Systems.
- Authors
Goulart, Francisco A. P.; Zandoná, Renan R.; Schmitz, Maicon F.; Ulguim, André R.; Andres, André; Agostinetto, Dirceu
- Abstract
Barnyard grass (Echinochloa sp.) is one of the main rice weeds. Knowledge of its emergence can support management measures. The present study models barnyard grass emergence at different flooded rice sowing periods. Furthermore, the effectiveness of the hydrothermal time model in estimating barnyard grass emergence is analyzed. Field emergence was monitored three times a week during two sowing times (October and November) and two growing seasons (2017/18 and 2018/19), in rice sown and unsown areas. Data were converted to cumulative emergence based on total seedlings. Soil temperature and moisture data were used to determine hydrothermal time. The sowing in October led to a continuous emergence of barnyard grass, while the sowing in late November led to different emergence rates. The highest emergence rates of barnyard grass occur in the first sowing time. The hydrothermal time model is adequate to estimate barnyard grass emergence in both sowing times.
- Subjects
ECHINOCHLOA crusgalli; ECHINOCHLOA; RICE; SOIL temperature; GROWING season
- Publication
Agronomy, 2020, Vol 10, Issue 11, p1756
- ISSN
2073-4395
- Publication type
Article
- DOI
10.3390/agronomy10111756