Nitrogen utilization efficiency by naturally colored cotton cultivars in semi-arid region

Knowledge on nitrogen (N) utilization efficiency in colored cotton enables the correct management of N fertilizers, optimizing yield and minimizing environmental degradation.The objective of this study was to evaluate the N utilization efficiency and to determine the accumulation of dry matter and N...

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Bibliographic Details
Published in:Ciência agronômica 2020-01, Vol.51 (4), p.1
Main Authors: Tartaglia, Francilene de Lima, Souza, Almir Rogerio Evangelista de, Santos, Allysson Pereira dos, Barros Júnior, Aurélio Paes, Silveira, Lindomar Maria da, Santos, Manoel Galdino dos
Format: Article
Language:English
Subjects:
AGRONOMY
Arid regions
Arid zones
Cotton
Cultivars
Design of experiments
Dry matter
Dry matter accumulation
Efficiency
Environmental degradation
Environmental management
Experimental design
Farms
Fertilization
Fertilizers
Fibers
Gossypium hirsutum L
Nitrogen
Recovery
Recovery efficiency
Seeds
Semi arid areas
Semiarid lands
Utilization
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Summary:Knowledge on nitrogen (N) utilization efficiency in colored cotton enables the correct management of N fertilizers, optimizing yield and minimizing environmental degradation.The objective of this study was to evaluate the N utilization efficiency and to determine the accumulation of dry matter and N by naturally colored cotton cultivars subjected to N fertilization in the Brazilian semi-arid region.The experiment was carried out under field conditions, at the Farm of the Federal Rural University of the Semi-Arid, in 2016 and 2017. The experimental design was in randomized blocks with split plots and four replicates, randomizing five N doses (0; 50; 100; 150 and 200 kg ha-1) in the main plot and four colored cotton cultivars (BRS Safira, BRS Rubi, BRS Topázio and BRS Verde) in the subplots. Dry matter and N accumulations, agronomic, recovery, agrophysiological and physiological efficiencies in N utilization, and harvest index were evaluated. Cotton accumulates around 130 kg ha-1 of N along its cycle and directs 56.3% to seeds, 29% to leaves, 10.6% to stem and 3.8% to fibers. Nitrogen agronomic efficiency and recovery efficiency decrease with increased N doses. The cultivar BRS Topázio is the most responsive to N fertilization and the cultivar BRS Verde is the least responsive.
ISSN:1806-6690
0045-6888
1806-6690
DOI:10.5935/1806-6690.20200061