Nitrogen fertilization (ammonium sulphate) in the morphophysiological characteristics of Brazilian mahogany seedlings
DOI:
https://doi.org/10.5902/2179460X85961Keywords:
Ammonium sulphate, Swietenia macrophylla, Nutrition of seedlingsAbstract
Brazilian mahogany (Swietenia macrophylla) known as “green gold” is a forest species of extreme importance for trade in the Brazilian market. However, in order to have a planting with trees producing quality wood, it is necessary to implant the cultivation with quality seedlings. Therefore, an experiment was established with the objective of evaluating the initial morphological and physiological development of Brazilian mahogany seedlings in soil enriched with different N doses. The Brazilian mahogany seedlings were produced in tubes filled with soil and after reaching about 10 cm in height, they were transplanted for the tested treatments. The soil used in the experiment was limed and incubated, then used to fill the plastic bags to which the seedlings were transplanted. The design used was completely randomized with five treatments and five repetitions, namely: T0 - without fertilization; T1 - 50 mg dm-3; T2 - 100 mg dm-3; T3 - 150 mg dm-3; T4 - 200 mg dm-3. After transplantation, the soil received N fertilization. These seedlings went through an adaptation period, and at the end of 90 days, measurements were performed. The greatest growth and production of dry matter was observed in the dose of 100 mg dm-3 of N. The greater development of the mahogany seedlings in this dose is related to the increase in the photosynthetic net rate, stomatal conductance, transpiration and CO2 concentration, under conditions that seem to be the most suitable for the seedlings of this species.
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