Atividade da enzima nitrato redutase em milho cultivado sob diferentes níveis de adubação nitrogenada e potássica
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Data
2011-11
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Resumo
Because of the use in human feeding, animal, and
high productive potential, corn is considered to be one of the
most important cultivated and commercialized cereals in the
world. The aim of this research was to evaluate the effect of
different potassium doses and nitrogen in the activity of the
enzyme nitrate reductase in the corn culture in a greenhouse
environment. Five dosages of nitrogen (0; 50; 100; 150 and
200kg ha-1) and five potassium dosages (0; 40; 80; 120 and
160kg ha-1) were used. The activity of the nitrate reductase was esteemed, in vivo after the plants reached four leaves totally
unfolded. The method that was used is based on the principle
of the amount of nitrite liberated by fragments of alive tissue in
a buffer in the presence of a permanent agent and substrate,
reflects the potential in situ activity of the enzyme nitrate
reductase. The activity of the enzyme nitrate reductase suffered
significant influence of the f nitrogen and potassium dosage
interaction, where the interaction N=100kg ha-1 and K=40kg
ha-1 provided the best medium of the experiment. From this
dosage on, the increase of nitrogen and potassium supplement
caused a reduction of the enzymatic activity.
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Zea mays L., Adubação, Enzima redutase do nitrato, Fertilization, Enzyme redutase of the nitrate
Citação
SILVA, Sueli Maria da et al. Atividade da enzima nitrato redutase em milho cultivado sob diferentes níveis de adubação nitrogenada e potássica. Ciência Rural, Santa Maria, v. 41, n. 11, p. 1931-1937, nov. 2011.