APROVEITAMENTO DE ÁGUA RESIDUÁRIA DE BOVINOCULTURA LEITEIRA NO CULTIVO DE CITRONELA: EFEITOS NA ATIVIDADE FOTOQUÍMICA E NA BIOMASSA

Leonardo da Silva Hamacher; Cristina Moll Hüther; Leonardo Duarte Batista da Silva; Dirlane de Fátima do Carmo; Joana Mayer Coutada; Thais Gandelman Schtruk; Carlos Rodrigues Pereira; Daiane Cecchin; Thelma de Barros Machado; Camila Ferreira de Pinho

doi:10.5327/Z2176-947820190482

Authors

Leonardo da Silva Hamacher Universidade Federal Rural do Rio de Janeiro (UFRRJ) https://orcid.org/0000-0001-9082-7965
Cristina Moll Hüther Universidade Federal Fluminense http://orcid.org/0000-0003-0655-5966
Leonardo Duarte Batista da Silva Universidade Federal Rural do Rio de Janeiro (UFRRJ) https://orcid.org/0000-0001-9082-7965
Dirlane de Fátima do Carmo Universidade Federal Fluminense https://orcid.org/0000-0002-6483-8158
Joana Mayer Coutada Universidade Federal Fluminense https://orcid.org/0000-0003-4085-6906
Thais Gandelman Schtruk Universidade Federal Fluminense https://orcid.org/0000-0002-0909-0941
Carlos Rodrigues Pereira Universidade Federal Fluminense https://orcid.org/0000-0003-4000-4324
Daiane Cecchin Universidade Federal Fluminense https://orcid.org/0000-0002-6098-1846
Thelma de Barros Machado Universidade Federal Fluminense https://orcid.org/0000-0001-9449-8695
Camila Ferreira de Pinho Universidade Federal Rural do Rio de Janeiro (UFRRJ) https://orcid.org/0000-0003-2861-2212

DOI:

https://doi.org/10.5327/Z2176-947820190482

Keywords:

Cymbopogon nardus L.; chlorophyll a fluorescence; photosynthesis; fertigation; medicinal plant;

Abstract

Dairy cattle wastewater (DCW) is an alternative to provide mineral nutrients,
reducing the use of fertilizers. Thus, the response of photochemical activity
and biomass gain in citronella under different nitrogen doses applied via
DCW slides were evaluated. Nitrogen was the reference element from which
the equivalent amount of DCW to be applied was calculated. Thus, nitrogen
rates applied via DCW were 100, 200, 300 and 400% in relation to mineral
fertilization used in the control. Chlorophyll a fluorescence, pigments and dry
mass were analyzed. The response of the citronella to the doses of DCW was
time-dependent and the energy that was absorbed by the phosphossites was
used to reduce the final acceptors in the electron transport chain, promoting
better photochemical efficiency at all doses, but, this did not reflect in the
biomass gain, mainly of the leaves.