http://repositorio.ufc.br/handle/riufc/21984 2026-06-01T05:18:08Z 2026-06-01T05:18:08Z Andrade, Sabrina de Sousa http://repositorio.ufc.br/handle/riufc/86396 2026-05-20T18:35:47Z 2026-01-01T00:00:00Z

Título: Resposta de duas cultivares de Celosia argentea var. plumosa à aplicação de fertilizante mineral de liberação controlada e diferentes doses de bokashi Autor(es): Andrade, Sabrina de Sousa Abstract: Brazilian floriculture, a sector with a revenue of R$ 11 billion (IBRAFLOR, 2021), depends on precise nutritional management for the cultivation of ornamental potted plants, such as Celosia argentea. The industry standard is the use of mineral fertilizers, such as controlled-release fertilizers (CRF), which optimize nutrient supply. However, the pursuit of sustainability and the reduction of dependence on synthetic inputs are driving biological alternatives, such as the biofertilizer bokashi. This study aimed to evaluate the effect of different doses of bokashi on the vegetative development and biomass accumulation of two cultivars of C. argentea var. plumosa (‘Kimono Scarlet’ (K.S.) and ‘Castle Orange’ (C.O.)), in comparison to CRF. The experiment was conducted in a completely randomized design (CRD), in a 2 x 6 factorial arrangement (cultivar x doses: 0, 1.7 g CRF, 2.5, 5, 10 and 20 g of bokashi.pot-1), with 14 repetitions, using coconut fiber substrate in 11-inch pots. The variations presented included plant height, stem diameter, flowering size, root length, and fresh and dry masses of the aerial part and root. The data were subjected to ANOVA and regression analysis to determine the dose of maximum technical efficiency (XMET). The analysis of variance showed a significant Dose x Cultivar interaction for most parameters, justifying a separate analysis. For the K.S. cultivar, bokashi proved to be a viable substitute and, in some aspects, superior to the mineral standard. The doses of 10 g and 20 g of bokashi were significantly superior to CRF in stem diameter and equivalent in the accumulation of dry mass of the aerial part. Cubic regression indicated a 10 g dose of bokashi as the XMET for height. For the C.O. cultivar, CRF was significantly superior to bokashi in total dry mass accumulation. However, doses of 10 g and 20 g of bokashi resulted in significantly larger inflorescences than CRF, indicating a positive effect for ornamental purposes. For C.O., it was not possible to determine a reliable XMET due to the inconsistency of the response at the tested doses. It is concluded that the effectiveness of bokashi depends on cultivar constraints. The biofertilizer is a sustainable and efficient alternative for cultivating ‘Kimono Scarlet’, with a dose of 10 g being recommended to maximize its development. For the ‘Castle Orange’ cultivar, CRF is still the most efficient management for total productivity. Tipo: TCC

2026-01-01T00:00:00Z Pinto, Maria Brena dos Santos http://repositorio.ufc.br/handle/riufc/86389 2026-05-20T11:13:08Z 2026-01-01T00:00:00Z

Título: Estratégias de manejo com uso de biocarvão e bioestimulante na mitigação dos efeitos danosos da salinidade no crescimento e fisiologia de plantas de algodão herbáceo Autor(es): Pinto, Maria Brena dos Santos Abstract: Cotton is a crop of great commercial importance due to its fiber, which is widely used by the textile industry, as well as for its various by-products. Considering that it is cultivated in several countries and under distinct climatic conditions, cotton shows fluctuations in productivity, with salinity being one of the main limiting factors. To mitigate the harmful effects caused by salts, the adoption of ameliorating strategies has become increasingly necessary. Coconut shell-based biochar and the use of biostimulants have emerged as alternatives for mitigation due to their distinct mechanisms of application and action. Therefore, the objective of the present study was to evaluate how the adoption of different strategies can mitigate the effects of salt stress on cotton. The experiment was conducted in a greenhouse at the Federal University of Ceará, Department of Crop Science, in a completely randomized design (CRD), arranged in a 4 × 2 factorial scheme, in which the first factor corresponded to the mitigation strategies (control, biochar, biostimulant, and biochar + biostimulant), and the second factor corresponded to the electrical conductivity of the irrigation water (0.2 dS m⁻¹ and 4.5 dS m⁻¹). Morphophysiological, biochemical, parameters were evaluated. The results showed foliar accumulation of Na⁺ and higher electrolyte leakage in salt stress. The use of biochar increased net photosynthesis and transpiration, resulting in higher water use efficiency, as well as higher K⁺ concentration in the roots, leading to a lower Na⁺/K⁺ ratio. The use of biostimulant resulted in an increase in the number of leaves and in the content of chlorophyll a, b, total, and carotenoids. The results obtained with the combined use of biochar and biostimulant were not efficient in mitigating salt stress. Thus, it is understood that the combination of biochar and biostimulant did not prove effective in alleviating salt stress, and the isolated use of each strategy is recommended. Tipo: TCC

2026-01-01T00:00:00Z Leitão, Miriane Nobre http://repositorio.ufc.br/handle/riufc/86388 2026-05-20T11:05:33Z 2026-01-01T00:00:00Z

Título: Pré-tratamento de sementes com nanobioestimulante na germinação e desenvolvimento inicial como estratégia de mitigação do estresse salino em algodão herbáceo Autor(es): Leitão, Miriane Nobre Abstract: Irrigation water salinity is a major constraint to production in semiarid irrigated agriculture because it impairs germination and early seedling establishment, which are decisive for stand formation in crops such as cotton. In this context, carbon dot–based nanobiostimulants (Arbolina®) have been investigated as an alternative to stimulate growth-related physiological responses and tolerance to abiotic stresses. This study evaluated the effects of Arbolina® seed treatment on cotton germination and early morphophysiological performance under saline and non-saline conditions. Two experimental stages were conducted: (i) a germination test in a BOD chamber on Germitest paper, in a completely randomized 2 × 7 factorial design (distilled water and 2.5 dS m⁻¹ × Arbolina® doses: 0, 20, 60, 100, 120, 180, and 220 mg L⁻¹), assessing first count (FC), final germination (FG), germination speed index (GSI), mean germination time (MGT), root length (RL), leaf area (LA), and fresh and dry biomass (FB and DB); and (ii) a greenhouse experiment in a 4 × 2 factorial design (0, 20, 60, and 100 mg L⁻¹ × 0.5 and 4.5 dS m⁻¹), including biometric traits, gas exchange, chlorophyll a fluorescence, leaf Na⁺ and K⁺ contents, Na/K ratio, electrolyte leakage (EL), and relative water content (RWC). In stage I, Arbolina® did not affect FC, FG, GSI, or MGT, while salinity reduced FC; however, early growth increased (RL, LA, and shoot biomass), especially under salinity, with better performance at 60 and 100 mg L⁻¹. In the greenhouse, salinity reduced growth and biomass traits. Arbolina® doses linearly increased A, gₛ, E, EiC, ΦPSII, and qP and promoted higher ETR (dose × salinity interaction), with emphasis on 100 mg L⁻¹, with no significant effects on Na⁺, Na/K ratio, EL, or RWC. Overall, Arbolina® did not change germination but improved early seedling growth under salinity and supported physiological and photochemical performance in the greenhouse assay. Tipo: TCC

2026-01-01T00:00:00Z Matias, Paulo Victor Gomes http://repositorio.ufc.br/handle/riufc/86381 2026-05-19T19:28:57Z 2026-01-01T00:00:00Z

Título: Substituição do milho seco por silagem de grão de milho sob diferentes formas de reidratação em dietas para leitões na fase de creche Autor(es): Matias, Paulo Victor Gomes Abstract: The objective was to evaluate the performance and economic viability of completely replacing dry corn with rehydrated corn silage in the feeding of piglets during the nursery phase. Thirty-two weaned piglets, with an average age of 21 days, were used, distributed in a randomized block design with four treatments: feed with ground corn (MIGM); feed with rehydrated corn silage with water (SGRA); feed with rehydrated corn silage with whey (SGRS); and feed with rehydrated corn silage with forage palm (SGRP). Daily feed intake, daily weight gain, feed conversion ratio, and the occurrence of diarrhea were evaluated during the periods of 21 to 34; 21 to 47; and 21 to 62 days of age. Between 21 and 34 days of age, animals fed a diet containing rehydrated corn silage with whey showed similar daily feed intake and daily weight gain, and better feed conversion compared to animals fed a diet with ground corn. However, between 21 and 47 and 21 and 62 days of age, animals fed a diet containing ground corn showed higher feed intake and daily weight gain compared to the other treatments. The occurrence of diarrhea did not differ between treatments in any of the evaluated periods. In the period from 21 to 34 days of age, no differences were observed in the cost per kilogram of weight gain among the treatments, whereas in the subsequent periods, piglets fed diets containing ground corn grain showed a lower cost per kilogram of weight gain, statistically differing from the other treatments. It is concluded that the total replacement of dry ground corn with rehydrated corn grain silage using water, whey, or forage cactus is not recommended for piglets during the nursery phase. Tipo: TCC

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