AZOSPIRILLUM BRASILENSE INNOCULATION COMBINED WITH DIFFERENT LEVELS OF NITROGEN FERTILIZATION AND ITS EFFECTS IN THE GRAIN SORGHUM SUBJECTED TO WATER RESTRICTION

ABSTRACT Rhizobacteria have a wide range of plant growth-promoting mechanisms of action, making them an alternative and/or complementary biological input for chemical fertilizers. In this respect, the present study aimed to assess growth and nitrogen accumulation in maize plants as a function of Azospirillum brasilense, Bacillus subtilis, zinc and nitrogen application at sowing. The experiment with the ‘AL Bandeirante’ maize variety was conducted in a greenhouse, using a completely randomized design. The treatments were arranged in a 2 x 2 x 2 x 2 factorial scheme, with six repetitions, considering the presence and absence of Azospirillum brasilense (5 g kg-1), Bacillus subtilis (5 mL kg-1) and zinc (20 g kg-1) in the seeds and addition or not of nitrogen (30 kg ha-1) to the soil. The variables assessed were plant height, stem diameter, leaf, stem, shoot, root and total dry weight, and shoot nitrogen content. Nitrogen fertilization in the absence of zinc increased shoot and total dry weight as well as shoot nitrogen content. Zinc applied to the seeds improved the total and stem dry weight of maize plants in the absence of Bacillus subtilis. Inoculation with Azospirillum brasilense and Bacillus subtilis increased the stem diameter and shoot nitrogen content of maize plants when nitrogen fertilization was not performed at sowing. There was no isolated or interaction effect between factors for plant height and root dry weight.

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

Journal of Agricultural Science ◽

10.5539/jas.v11n9p21 ◽

2019 ◽

Vol 11 (9) ◽

pp. 21

Author(s):

Guilherme V. Pimentel ◽

Silvino G. Moreira ◽

Mateus O. T. de Avila ◽

Antonio Henrique F. de Carvalho ◽

Alessandro A. P. da Silva ◽

...

Keyword(s):

Nitrogen Fertilization ◽

No Reduction ◽

Block Design ◽

Climatic Conditions ◽

Limited Information ◽

Herbicide Application ◽

Maize Hybrids ◽

Growing Seasons ◽

Randomized Block Design ◽

Different Levels

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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Influence of Different Levels of Water Deficit and Nitrogen Fertilization on Maize Productivity, Nitrogen Uptake and Soil Properties.

Journal of King Abdulaziz University-Meteorology Environment and Arid Land Agriculture Sciences ◽

10.4197/met.14-1.1 ◽

2003 ◽

Vol 14 (1) ◽

pp. 3-24

Author(s):

SAMIR AL-SOLAIMANI ◽

MOHAMED KIWAN ◽

ABDULLAH BAGOUR

Keyword(s):

Soil Properties ◽

Water Deficit ◽

Nitrogen Uptake ◽

Nitrogen Fertilization ◽

Maize Productivity ◽

Different Levels

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Root and shoot responses of upland New Rice for Africa varieties to fluctuating soil moisture conditions as affected by different levels of nitrogen fertilization

Journal of Agronomy and Crop Science ◽

10.1111/jac.12390 ◽

2020 ◽

Vol 206 (3) ◽

pp. 322-337

Author(s):

Daniel Makori Menge ◽

Mana Kano‐Nakata ◽

Akira Yamauchi ◽

Roel Rodriguez Suralta ◽

Daigo Makihara

Keyword(s):

Soil Moisture ◽

Nitrogen Fertilization ◽

Moisture Conditions ◽

Different Levels

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Inoculation of Azospirillum brasilense associated with silicon as a liming source to improve nitrogen fertilization in wheat crops

Scientific Reports ◽

10.1038/s41598-020-63095-4 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Fernando Shintate Galindo ◽

Salatiér Buzetti ◽

Willian Lima Rodrigues ◽

Eduardo Henrique Marcandalli Boleta ◽

Vinicius Martins Silva ◽

...

Keyword(s):

Nitrogen Fertilization ◽

Azospirillum Brasilense

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PERÍODOS DE INTERFERÊNCIA DE PLANTAS DANINHAS NO CULTIVO DE SORGO GRANÍFERO, COM E SEM ADUBAÇÃO NITROGENADA DE COBERTURA

Revista Brasileira de Milho e Sorgo ◽

10.18512/1980-6477/rbms.v17n2p240-250 ◽

2018 ◽

Vol 17 (2) ◽

pp. 240

Author(s):

JIVAGO OLIVEIRA ROSA ◽

MICHELI SATOMI YAMAUTI ◽

JORGE LUIS TEJADA SORALUZ ◽

PEDRO LUÍS DA COSTA AGUIAR ALVES

Keyword(s):

Sorghum Bicolor ◽

Nitrogen Fertilization ◽

Grain Sorghum ◽

N Fertilization ◽

Cyperus Rotundus ◽

Critical Periods ◽

Raphanus Raphanistrum ◽

Weed Interference ◽

Sorghum Grains ◽

And Control

RESUMO - O trabalho teve como objetivo determinar o efeito da adubação nitrogenada de cobertura sobre a comunidade infestante e sobre os períodos de interferência das plantas daninhas na cultura do sorgo granífero ‘882’, em sistema convencional. Foram estudados os períodos de convivência e controle de 0, 7, 14, 32, 42, 57, 72 e 118 dias após a emergência (DAE), totalizando dezesseis tratamentos, dispostos em blocos casualizados, com quatro repetições, em dois níveis de adubação, 0 e 70 kg ha-1 de N. A adubação não alterou a composição da comunidade infestante, destacando-se Raphanus raphanistrum, Cyperus rotundus, Alternanthera tenella e Amaranthus ssp. como as espécies de maior importância relativa. Os períodos críticos de prevenção da interferência (PCPI) do sorgo ‘822’ com e sem adubação foi de 4 aos 72 e 7 aos 90 DAE, respectivamente. A interferência das plantas daninhas reduziu em 31 e 26% a produtividade estimada de 6859,5 e 6417,1 kg ha-1 de grãos do sorgo na presença e na ausência da adubação nitrogenada, respectivamente, sendo que adubação nitrogenada realizada aos 45 dias após a emergência da cultura aumentou em 7% a sua produtividade.Palavras-chave: Sorghum bicolor, competição, nitrogênio. WEED INTERFERENCE PERIODS ON GRAIN SORGHUM CROP WITH AND WITHOUT NITROGEN FERTILIZATION ABSTRACT - The aim of this work was to determine the effect of nitrogen fertilization on the weed community and on the periods of interference of weeds in the ‘882’ grain sorghum in a conventional system. The periods of coexistence and control were 0, 7, 14, 32, 42, 57, 72 and 118 days after emergence (DAE), totaling sixteen treatments, arranged in randomized blocks, with four replications, at two levels of fertilization, 0 and 70 kg ha-1 of N. Fertilization did not change the composition of the weed community, with the species Raphanus raphanistrum, Cyperus rotundus, Alternanthera tenella and Amaranthus ssp. being the most important at all levels of fertilization. The critical periods of interference prevention (CPIP) of sorghum ‘822’ with and without fertilization were 4 at 72 and 7 at 90 DAE, respectively. Weed interference reduced the estimated yield of 6859.5 and 6417.1 kg ha-1 of sorghum grains by 31 and 26% in the presence and absence of nitrogen fertilization, respectively, and nitrogen fertilization done at 45 days after the emergence of the crop increased its productivity by 7%.Keywords: Sorghum bicolor, competition, nitrogen.

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