Nitrogênio (15 N) e atividade das enzimas redutase do nitrato e glutamina sintetase na cultura do milho em plantio direto / Evaluation of you cultivate of corn the application of Nitrogen and molibdênio and effect on the activity of the enzymes nitrate redutase and glutamina sintetase

AUTOR(ES)

Manoel Mota dos Santos

DATA DE PUBLICAÇÃO

2008

RESUMO

This work was developed using data of the rehearsal conducted in the experimental station of CoimbraMG, area belonging to Federal University of Viçosa. It was aimed at through this theory: 1 - to evaluate the effect of the Nitrogen manuring on the activity of the enzymes nitrate redutase (NR) and Glutamina sintetase (GS) in corn cultivars in reduced spacing and 2 - to evaluate the effect of the time of application of Nitrogen, enriched with 15N, on the productivity of grains and its distribution along the plant, in the presence and Molibdenium absence in system of direct sowing in the culture of the corn. To reach the 1 main, the experiment was conducted using two corn cultivars (AG 9010 and P 3041) and for the conclusion of the objective 2, the experiment was accomplished just by using AG 9010 cultivar, however using the same area. The planting was accomplished in November staying a population of 50.000 plants ha-1. The experimental portion was composed by eight lines of 5,0 meters in length with spacing of 0,50 m among the planting lines. The useful area was 12 m2. The planting manuring was accomplished with 380 kg ha-1. of the formulation 8 -28 -16 for the plots that received Nitrogen. For the zero dose of Nitrogen the manuring was accomplished with 106 kg of P2O5, in the form of Simple Superfosfato and 60 kg of K2O, as Chloride of Potassium, in the plots. The covering and planting manuring with Nitrogen was accomplished with urea, using 150 kg ha-1, accomplishing irrigation just after the application of urea, according to description of each treatment. The time of application of the Nitrogen interferes in the independent enzymatic activity of the manuring with Molibdenium. The largest productivity of grains and larger activity of the redutase of the nitrate was obtained with the application of Nitrogen at time the corn presented with four leaves completely expanded. There was difference in the enzymatic activity among them cultivars, influenced by the vegetative cycles. The best supply of N during the cycle and the largest productivity was obtained with the application of the fertilizer in the stadium of four expanded leaves of the corn. It was not found effect of the manuring of Molibidenium on the appraised characteristics. The application of N in the pre- sowing of the corn, 15 days before the planting, it demonstrated not to be advisable for the soil conditions and climate studied. The part of the corn plant with larger allocation of N was the grain. The medium recovery of Nitrogen in the originating from plant the fertilizer, was 6%. The medium amount of Nitrogen in the originating from plant the fertilizer, was 9,21 kg ha-1, but when of the application of urea in the stadium of four leaves the recovery arrives around 16%. The organic matter of the soil is the main source of N for the corn plants.

ASSUNTO(S)

adubação nitrogenada zea mays manuring Época de aplicação nitrogen zea mays fitotecnia application time

Documentos Relacionados

• Partição de nitrogênio e atividade das enzimas nitrato redutase e glutamina sintetase em duas cultivares contrastantes de milho
• Atividade das enzimas redutase do nitrato e glutamina sintetase em cafeeiro arábica.
• Atividade das enzimas nitrato redutase e glutamina sintetase em famílias endogâmicas S1 das populações de milho Sol da Manhã NF e Catetão
• Transformações do nitrogênio (15 N) da uréia na cultura do arroz irrigado.
• Atividade da redutase do nitrato e glutamina sintetase em folhas de cafeeiro durante o desenvolvimento dos frutos