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All publications of “Renato Lemos dos Santos”

2 results

Nitrate Reductase Activity and Nitrogen and Biomass Accumulation in Sugarcane under Molybdenum and Nitrogen Fertilization

Renato Lemos dos Santos, Fernando José Freire, Emídio Cantídio Almeida de Oliveira, Maria Betânia Galvão dos Santos Freire ORCID logo , Jason Brossard West, José de Arruda Barbosa, [...]


ABSTRACT Prior research on sugarcane showed increment of productivity following molybdenum (Mo) fertilization and some indication of the potential role either on nitrate reductase activity (NRA). However, this increment can depend on sugarcane variety and nitrogen (N) fertilization. This study aimed to evaluate the effect of Mo fertilization on Mo uptake, on NRA, nitrate (NO3–-N), and ammonium (NH4+-N) contents in leaves and roots of sugarcane, and the accumulation of N and biomass across two sugarcane varieties (RB 867515 and RB […]

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Nutrient uptake and use efficiency of elephant grass in the presence of crude gypsum

Renato Lemos dos Santos, Vinícius Mendes de Azevedo, Fernando José Freire, Alexandre Tavares da Rocha, José Alves Tavares, Maria Betânia Galvão dos Santos Freire


The cultivation of Elephant or Napier grass (Pennisetum purpureum) in the gypsum- producing region of Araripe, in the west of the state of Pernambuco in northeastern Brazil, may be viable as alternative energy, especially when the soil fertility is improved. The objective of this study was to evaluate the effect of crude gypsum on the nutritional status, mineral composition, biomass production, and nutrient uptake efficiency of elephant grass varieties in Araripe, Pernambuco. For this purpose, three elephant grass varieties: Cameroon, […]