000			02617nab a2200301 i 4500
003			BR-BrBNA
005			20230922173544.0
008			230808b2020 bl.ar|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aH60 _b0140
100			_aSilva, D.R.O.
100			_aSilva, A.A.A.
100			_aNovello, B.D.
100			_aRieder, E.
100			_aAguiar, A.C.M.
100			_aBasso, C.J.
245			_aNitrogen availability and glyphosate hormesis on white oat
500			_aPublicação on-line; 30 ref.; 1 table; 2 illus.; Summary (En)
520			_a ABSTRACT Background: The effect of low rates of glyphosate has been widely studied in several crops. Low nitrogen stress reduces carbohydrate synthesis and we hypothesize that hormesis from glyphosate occurs at low nitrogen availability. Objective: To evaluate the effects of glyphosate hormesis at different levels of nitrogen on the growth and yield of white oat. Methods: A two-factor factorial (2x7) was conducted in field testing at nitrogen levels (50 and 90 kg ha-1) and low rates of glyphosate rates (0 - 180 g a.e. ha-1). The glyphosate was applied at the second node already formed. The growth and yield were evaluated. Results: Plant height was not affected by the nitrogen levels. A low rate of glyphosate induced a plant height increase up of around 10%, but the stimulus was no maintained over in the time. Glyphosate hormesis had a greater effect on dry weight under low nitrogen than under high nitrogen conditions. The glyphosate provided a 43% increase in dry weight at a low nitrogen level when applied at rates consistent with a 4.1% field rate. Glyphosate hormesis increased the yield by approximately 30%, and the yield was higher yield under low nitrogen conditions. Conclusions: The plant height stimulus from low doses of glyphosate was not sustained over time. Glyphosate hormesis stimulus persisted and culminated in an increase in dry weight and grain yield. The hormesis effect on dry weight and yield is more pronounced under lower nitrogen availability. Keywords: Avena sativa low rate herbicide growth stimulus yield
650			_aAVENA SATIVA
650			_aAVEIA
650			_aHERBICIDA
650			_aNITROGÊNIO
773	0		_0886 _91817 _dLondrina-PR : Sociedade Brasileira da Ciência das Plantas Daninhas, 1978 _o2023-031024 _tPlanta Daninha (Brazil) _x0100-8358; 1806-9681 (on-line) _gv. 38 p. 1-7; (2020) _wBR2023000846
856			_uhttps://www.scielo.br/j/pd/a/b4HbDzDxFx79tybRHJJF9dS/?format=pdf&lang=en
942			_cAnalítica
999			_c9760 _d9760