Abstract
ABSTRACT The aim of this study was to evaluate productive and physiological traits of basil cv. Italiano Genovese grown in nitrogen-fertilized soil. We studied five doses of nitrogen (25, 50, 75, 100 and 125 kg ha-1), in urea form. The experimental design was completely randomized, with four replicates. The maximum plant height was 79 cm, applying 65.7 kg ha-1 N. Shoot fresh and dry masses (814.1 g plant-1 and 111.4 g plant-1, respectively) and productivity (4.4 t ha-1) reached maximum values at 86.2; 80.2 and 82.5 kg ha-1 N, respectively. The highest N content in plant shoot was 26.1 g kg-1 at 125 kg ha-1 N. Photosynthesis and instantaneous carboxylation efficiency obtained maximum responses at doses of 85.3 and 83.3 kg ha-1 N, respectively. Stomatal conductance and transpiration increased with N additional rates.
Highlights
Respostas fisiológicas e produtividade do manjericão em função da adubação nitrogenada Objetivou-se com este estudo avaliar características fisiológicas e produtividade do manjericão cv
Nitrogen fertilizer affected the traits related to gas exchanges of basil plants; the fertilization did not affect the internal CO2 concentration (Ci), carbon dioxide concentrations (Ci/Ca) ratio, growth and productivity, though
(23.1 μmol CO2 m-2 s-1 and 0.07) at doses of 85.3 and 83.3 kg ha-1 N, respectively, representing an increase of, approximately, 40% for photosynthesis and instantaneous carboxylation efficiency in relation to the values obtained (16.5 μmol CO2 m-2 s-1 and 0.05) at the lowest dose tested in this experiment (25 kg ha-1 N)
Summary
Respostas fisiológicas e produtividade do manjericão em função da adubação nitrogenada Objetivou-se com este estudo avaliar características fisiológicas e produtividade do manjericão cv. A altura máxima das plantas foi de 79 cm, sob a dose de 65,7 kg ha-1 de N. O maior teor de N na parte aérea das plantas foi de 26,1 g kg-1 obtido sob a dose de 125 kg ha-1 de N. Para a condutância estomática e a transpiração observou-se aumento com acréscimo das doses de nitrogênio. Argyropoulou et al (2015) showed that photosynthesis, transpiration and stomatal conductance were reduced in basil plants under low concentrations of N in a nutrient solution. These authors verified that the primary metabolism of this crop is extremely limited by N availability. Sifola & Barbieri (2006) verified that high amounts of nitrogen fertilizer in soil allowed higher productive yields both for fresh mass and for essential oil
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