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Revista Brasileira de Ciência do Solo
ISSN: 0100-0683
[email protected]
Sociedade Brasileira de Ciência do Solo
Brasil
Mauad, Munir; Arroyo Garcia, Rodrigo; Mussury Franco Silva, Rosilda Mara; Freire da Silva,
Thiago Alexandre; Schroeder, Igor Miguel; Knudsen, Carlos Henrique; Wanderlinde
Quaresma, Elias Vinicius
PRODUÇÃO DE MATÉRIA SECA E ACÚMULO DE MACRONUTRIENTES NA PARTE
AÉREA DAS PLANTAS DE NIGER
Revista Brasileira de Ciência do Solo, vol. 39, núm. 2, 2015, pp. 533-540
Sociedade Brasileira de Ciência do Solo
Viçosa, Brasil
Available in: http://www.redalyc.org/articulo.oa?id=180239737021
Abstract
Studying nutrient uptake and dry matter accumulation in plants as affected by crop developmental stages is essential to establish
and assist strategies for crop fertilization. The aim of this study was to assess shoot dry matter and macronutrient accumulation in
Guizotia abyssinica (niger) at different growth and development stages. A randomized block experimental design with five
replications was used. Shoot samples of the plants were taken at 15, 30, 45, 60, 75, and 90 days after seedling emergence (DAE).
At each sampling, plants were separated into leaves, stem + branches, flower heads, and achenes. The samples were then dried
until reaching constant weight to evaluate dry matter and N, P, K, Ca, Mg, and S contents. Macronutrient concentration in niger
shoots showed the following order of nutrient export: N > Ca > Mg > P > K > S. Conversely, concentration in achenes at harvest
followed the order N > P > Ca > Mg > S > K. Special attention must be paid to maintaining appropriate availability of N and P in
initial growth stages due to the short developmental cycle and early flowering of niger. Nutrient export and harvest index are low in
niger plants, resulting in a higher nutrient supply for the crop in rotation.
Keywords
Guizotia abyssinica, nutrient uptake rate, biodiesel.
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