Efeitos da adubação nitrogenada em cobertura sobre a seletividade de herbicidas à cultura do milho

Nicolai, Marcelo; Ovejero, R. F. Lopez; Carvalho, Saul Jorge Pinto de; Moreira,; Christoffoleti, Pedro Jacob

doi:10.1590/s0100-83582006000200010

Cited by 8 publications

(8 citation statements)

References 7 publications

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“…As for maize crop yield, for both Marechal Cândido Rondon and Entre Rios do Oeste, there were no significant effects in any of the study sources of variation, nor for their interaction (Table 7). Nicolai et al (2006) e Procópio et al (2006) found results similar to those present in maize crops, i.e., the application of mesotrione did not interfere in the development and yield of the crop.…”

supporting

confidence: 70%

Intoxication of Mesotrione in Corn Inoculated with Azospirillum brasilense and with Application of Plant Growth Regulators

et al. 2019

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The objective of this study was to evaluate the effect of intoxication by mesotrione herbicide on the initial development and yield of maize after seed inoculation or foliar spray application with Azospirillum brasilense and application of plant regulators. Therefore, three experiments were performed: one under greenhouse conditions and two under field conditions, in different locations. In all experiments, a randomized block design was used with a 2 x 4 factorial arrangement, representing presence (192 g ha-1) or absence of mesotrione and four treatments corresponding to the control; seed inoculation with A. brasilense; foliar spray application of A. brasilense; foliar spay application of auxin + gibberellin + cytokine (AX + GA + CK), and foliar spay applications with mesotrione were carried out at the V3 stage of the crop. The results from the greenhouse experiment, with mesotrione application, were intoxication of 7.12%, which reduced total chlorophyll content by 10.15% and carotenoid content by 75.86%, leading to reductions in gas exchange and chlorophyll a fluorescence, and increased activity of antioxidative enzymes. Under field conditions, the treatments did not reduce the effects of intoxication during the initial development of maize crop and did not increase crop yield. It was concluded that the use of A. brasilense and plant regulators did not protect maize against mesotrione intoxication in the initial development, nor did it increase yield.

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confidence: 70%

Intoxication of Mesotrione in Corn Inoculated with Azospirillum brasilense and with Application of Plant Growth Regulators

et al. 2019

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“…Currently, for yields above 12 t ha -1 of maize, hybrids with high productive potential have been used and are fertilized with nitrogen doses of up to 240 kg ha -1 (Resende et al, 2012). These N levels are far above the doses tested in several studies on the interaction between herbicides and nitrogen fertilization timing (Nicolai et al, 2006;Guerra et al, 2010;Rodrigues et al, 2012;Souza Jr., 2015). Significant interactions between N fertilization rate and weed control efficiency of herbicides have been observed (Cathcart & Chandler;Swanton, 2004;Sønderskov, Swanton, & Kudsk, 2012).…”

Section: Introductionmentioning

confidence: 82%

Interactions Between Herbicide Application and Timing of Nitrogen Fertilization in Maize Hybrids

Pimentel¹,

Moreira²,

Ávila³

et al. 2019

JAS

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Maize hybrids have different levels of tolerance to the herbicide nicosulfuron, depending on the dose, the environment, the phenological stage of the plant and the timing of nitrogen fertilization, and phytotoxic effects can occur without proper management. There is also limited information on the selectivity of current genetically modified hybrids for other recommended herbicides, such as tembotrione. Thus, the objective of this study was to evaluate the effects of herbicides (tembotrione and nicosulfuron) and the timing of nitrogen fertilization on the yield of maize hybrids. The experimental design was a randomized block design, in a 4 × 2 factorial arrangement, with 4 replicates. The treatments consisted of four treatments [weeding; nicosulfuron + atrazine (20 and 32 + 1250 g ha-1 ai) and tembotrione + atrazine (75.6 + 1250 g ha-1 ai)] and two nitrogen fertilization times (0 and 7 days after application). Maize hybrids P30F53 Leptra, DKB 230PRO3 and KWS 9004PRO2 were assessed in two growing seasons (1st and 2nd harvest) during the 2016/2017 growing season. The percentages of weed control; phytotoxicity at 7, 14 and 21 days after application (DAA); plant height; number of rows per ear; and yield at harvest were evaluated. All herbicides were more effective in controlling weeds at the 1st harvest because of favourable climatic conditions. Nitrogen fertilization can be carried out on the same day as the application of the herbicides nicosulfuron and tembotrione with no reduction in yield for the hybrids P30F53 Leptra, DKB 230PRO3 and KWS 9004PRO2.

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“…Many farmers in Midwestern Brazil do not use nicosulfuron because corn is sensitive to it. In addition, nicosulfuron application near to nitrogen fertilizer with fast nitrogen release enhances its phytotoxicity and can reduce plant height and grain yield (Nicolai et al, 2006;Guerra et al, 2010). A recent study on the timing of nitrogen application near nicosulfuron did not show significant effect on corn grain yield (Rodrigues et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Response of Sensitive Corn Hybrids to the Association of Nicosulfuron and Timing of Nitrogen Application

et al. 2019

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Nicosulfuron is an herbicide used in corn crop for controlling weeds, some hybrids are sensitivity to nicosulfuron even more when it is applied near to the application of nitrogen fertilizers. Thus, this study aimed to evaluate the response of sensitive corn hybrids to association of urea and coated urea applied near to nicosulfuron application on V4 corn stage. P 3646 hybrid was the most sensitive, and urea and coated urea applied near to nicosulfuron had significant effect on corn growth for all hybrids. Most hybrids showed high or significant (p < 0.10) correlation coefficients for grain yield, cob length and row per ear. SYN 7341 hybrid was the one that showed better results in grain yield with urea and nicosulfuron combination. Coated urea should not be applied after V8corn stage when nicosulfuron is applied at V4.

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Efeitos da adubação nitrogenada em cobertura sobre a seletividade de herbicidas à cultura do milho

Cited by 8 publications

References 7 publications

Intoxication of Mesotrione in Corn Inoculated with Azospirillum brasilense and with Application of Plant Growth Regulators

Intoxication of Mesotrione in Corn Inoculated with Azospirillum brasilense and with Application of Plant Growth Regulators

Interactions Between Herbicide Application and Timing of Nitrogen Fertilization in Maize Hybrids

Response of Sensitive Corn Hybrids to the Association of Nicosulfuron and Timing of Nitrogen Application

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