Abstract
ABSTRACT: This study aimed to assess the efficiency and selectivity of herbicides in rice submitted to sprinkler and flood irrigation systems. The experimental design was a randomized block design arranged in a 2 × 9 factorial scheme. Factor A consisted of irrigation systems (sprinkler and flood) and Factor B consisted of herbicide treatments (T1 - control; T2 - imazethapyr + imazapic, 75 + 25 g a.i. ha-1; T3 - imazethapyr + imazapic, 150 + 50 g a.i. ha-1; T4 - imazapic + imazapyr, 73.5 + 24.5 g a.i. ha-1; T5 - imazapic + imazapyr, 147 + 49 g a.i. ha-1; T6 - imazethapyr, 106 g a.i. ha-1; T7 - imazethapyr, 212 g a.i. ha-1; T8 - sequential application of imazethapyr + imazapic, 75 + 25 g a.i. ha-1; and T9 - sequential application of imazapic + imazapyr, 73.5 + 24.5 g a.i. ha-1). The application of imazethapyr and formulated mixtures of imazethapyr + imazapic and imazapyr + imazapic provided a control higher than 97% in flood and sprinkler irrigation systems. Herbicide selectivity is not altered in the sprinkler irrigation system when compared to the flood irrigation system.
Highlights
This study aimed to assess the efficiency and selectivity of herbicides in rice submitted to sprinkler and flood irrigation systems
Factor A consisted of irrigation systems and Factor B consisted of herbicide treatments (T1 – control; T2 – imazethapyr + imazapic, 75 + 25 g a.i. ha-1; T3 – imazethapyr + imazapic, 150 + 50 g a.i. ha-1; T4 – imazapic + imazapyr, 73.5 + 24.5 g a.i. ha-1; T5 – imazapic + imazapyr, 147 + 49 g a.i. ha-1; T6 – imazethapyr, 106 g a.i. ha-1; T7 – imazethapyr, 212 g a.i. ha-1; T8 – sequential application of imazethapyr + imazapic, 75 + 25 g a.i. ha-1; and T9 – sequential application of imazapic + imazapyr, 73.5 + 24.5 g a.i. ha-1)
A significant difference was observed between herbicides in the assessment performed at seven days after herbicide application (DAH) (Table 2)
Summary
This study aimed to assess the efficiency and selectivity of herbicides in rice submitted to sprinkler and flood irrigation systems. Factor A consisted of irrigation systems (sprinkler and flood) and Factor B consisted of herbicide treatments (T1 – control; T2 – imazethapyr + imazapic, 75 + 25 g a.i. ha-1; T3 – imazethapyr + imazapic, 150 + 50 g a.i. ha-1; T4 – imazapic + imazapyr, 73.5 + 24.5 g a.i. ha-1; T5 – imazapic + imazapyr, 147 + 49 g a.i. ha-1; T6 – imazethapyr, 106 g a.i. ha-1; T7 – imazethapyr, 212 g a.i. ha-1; T8 – sequential application of imazethapyr + imazapic, 75 + 25 g a.i. ha-1; and T9 – sequential application of imazapic + imazapyr, 73.5 + 24.5 g a.i. ha-1). The application of imazethapyr and formulated mixtures of imazethapyr + imazapic and imazapyr + imazapic provided a control higher than 97% in flood and sprinkler irrigation systems. HELGUEIRA, D.B. et al Weed management in rice under sprinkler and flood irrigation systems level the field aiming at achieving an adequate irrigation. Soil physical properties are intensively modified and its compaction may occur due to soil tillage (Pinto et al, 2016)
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