https://repositorio.ifgoiano.edu.br/handle/prefix/221 Sun, 02 Aug 2026 19:59:16 GMT 2026-08-02T19:59:16Z https://repositorio.ifgoiano.edu.br/handle/prefix/6835 Título: VIABILIDADE AGRONÔMICA DO USO DE MICRORGANISMOS SOLUBILIZADORES E DO PÓ DE ROCHA NEFELINA SIENITO COMO FONTE DE POTÁSSIO NA CULTURA DA MANDIOCA Autor(es): Claudio, Flavio Lopes Primeiro Orientador: Valicheski, Romano Roberto Primeiro Membro da Banca: Chaibub, Amanda Abdallah Segundo Membro da Banca: Alves, Estenio Moreira Abstract: In the context of plant mineral nutrition, the reliance on soluble fertilizers, especially potassium fertilizers, has generated concerns related to geopolitical relations, finite reserves, price volatility, and environmental impacts. Considering this, the objective was to evaluate the agronomic efficiency of using solubilizing microorganisms and nepheline syenite rock powder as a potassium source in cassava cultivation. The study was carried out in field in the rural area of Iporá-GO, from June 2024 to June 2025. The treatments were distributed in a randomized complete block design (RCBD) with split plots, in a 3 x 8 factorial scheme, with four replications. Three potassium sources were evaluated: 100% rock dust (100% PR); 100% potassium chloride (100% KCl); and 50% rock dust + 50% KCl (50% PR + 50% KCl). And eight treatments with microorganisms: Control; Bacillus amyloliquefaciens (Amy); Bacillus aryabhattai (Ary); Cladosporium cladosporioides (Cla); and the combinations Amy + Ary, Amy + Cla, Ary + Cla, and Amy + Ary + Cla. Treatments containing nepheline syenite rock powder resulted in a greater number and weight of roots per plant, as well as higher starch and root productivity, compared to KCl fertilizer. The Amy + Ary and Amy + Cla co-inoculations contributed to increased dry matter and starch content in the roots. Nepheline syenite has shown potential to partially or completely replace KCl as a potassium source in cassava cultivation. The evaluated microorganisms contributed to improving the industrial quality of the roots. Editor: Instituto Federal Goiano Tipo: Dissertação Fri, 10 Jul 2026 00:00:00 GMT https://repositorio.ifgoiano.edu.br/handle/prefix/6835 2026-07-10T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/6752 Título: CURVA DE INCUBAÇÃO DO PÓ DE ROCHA CARBONATITO FOSFÁTICO COMO REMINERALIZADOR DE SOLO Autor(es): Pimentel, Felipe Leiber Coelho Primeiro Orientador: Valicheski, Romano Roberto Primeiro Membro da Banca: Oliveira, Silvia Sanielle Costa de Segundo Membro da Banca: Alves, Estenio Moreira Abstract: The high dependence on soluble mineral fertilizers in Brazilian agriculture has encouraged the search for alternative inputs capable of promoting soil fertility in a more sustainable manner, among it the soil remineralizers stand out. This study aimed to evaluate the incubation curve of phosphate carbonatite and its effects on the chemical attributes of a Dystrophic Red Latosol. The experiment was carried out under greenhouse conditions using a randomized block design with four replications and rates of 0, 1, 3, and 5 t ha⁻¹ of the remineralizer. Soil samples were collected every 30 days during an incubation period of up to 120 days. Throughout the evaluation period, a gradual increase in soil pH and a reduction in potential acidity were observed, especially at the highest application rates, reflecting the progressive dissolution of carbonate minerals. The phosphate carbonatite application promoted a continuous increase in soil phosphorus contents during incubation, indicating the progressive release of apatites present in the material. Changes were also observed in cation exchange capacity, base saturation, and the dynamics of micronutrients (Cu, Fe, Mn, and Zn), mainly associated with changes in soil pH. Overall, the results indicate that phosphate carbonatite acts as a gradual release remineralizer with potential to be integrated into sustainable soil fertility management strategies, particularly in highly weathered tropical environments. Editor: Instituto Federal Goiano Tipo: Dissertação Wed, 10 Jun 2026 00:00:00 GMT https://repositorio.ifgoiano.edu.br/handle/prefix/6752 2026-06-10T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/6650 Título: PARÂMETROS NUTRICIONAIS DA CANA-DE-AÇÚCAR CULTIVADA COM CARBONATITO FOSFÁTICO E MICRORGANISMOS BIOSSOLUBILIZADORES DE FÓSFORO Autor(es): Lemes, Breno Caires Candido Pereira Primeiro Orientador: Valicheski, Romano Roberto Abstract: Brazil's dependence on imported fertilizers and the low availability of phosphorus in tropi-cal soils intensify the search for sustainable alternatives for crop nutrition. The objective was to evaluate the nutritional status of sugarcane subjected to different phosphorus sources associated with biosolubilizing microorganisms. The experiment was carried out in a green-house, in a randomized block design with four replications. Three phosphorus sources were evaluated (phosphate carbonatite rock powder, single superphosphate, and a combination of both) associated with inoculation/co-inoculation of Bacillus spp., Cladosporium cladospori-oides, and Trichoderma harzianum. Ninety-five days after planting, foliar macro- and mi-cronutrient levels were determined. The results showed that the use of the remineralizer provided phosphorus levels like soluble fertilizer, in addition to contributing to potassium supply. The combination of sources favored an increase in zinc. Regarding microorganisms, Trichoderma harzianum stood out by promoting increases in phosphorus, sulfur, and micro-nutrients, regardless of the source used, while Bacillus spp. and Cladosporium cladospori-oides showed greater efficiency when associated with poorly soluble sources. It is concluded that the use of remineralizers associated with biosolubilizing microorganisms constitutes a promising strategy to increase the nutritional efficiency of sugarcane, reduce dependence on imported fertilizers, and promote sustainable production systems. Editor: Instituto Federal Goiano Tipo: Dissertação Wed, 15 Apr 2026 00:00:00 GMT https://repositorio.ifgoiano.edu.br/handle/prefix/6650 2026-04-15T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/6628 Título: SUPLEMENTAÇÃO FOLIAR COM AMINOÁCIDOS: IMPACTOS NO METABOLISMO DA CLOROFILA E NA PRODUTIVIDADE DO ALGODÃO HERBÁCEO Autor(es): Santos, Indiane Mirelle Ferreira Abstract: Herbaceous cotton is a crop of considerable economic and historical importance, widely cultivated in over 70 countries and responsible for generating billions of dollars in international trade. In Brazil, cotton productivity has increased due to the adoption of more efficient cultivars and improved management practices; however, low-fertility soils, such as those prevalent in the Cerrado region, remain a significant constraint. In this context, foliar fertilization, particularly when associated with amino acids, has emerged as a promising strategy, as it enhances nutrient uptake, improves stress tolerance, and promotes plant productivity. Therefore, this study aimed to evaluate the effects of foliar application of an amino acid-based biostimulant on the physiological and yield-related characteristics of cotton plants. The experiment was conducted using a randomized complete block design, with six treatments and four replications. Treatments consisted of six doses of an amino acid-based biostimulant (0, 200, 400, 600, 800, and 1000 mL ha⁻¹), applied via foliar spraying at the flowering phenological stage (R1). The cotton cultivar used was FM 975 WS. The evaluated variables included SPAD index, dry matter accumulation, number of bolls per plant, and yield. Overall, the application of biostimulants showed potential to enhance both physiological performance and yield of cotton plants when applied at appropriate rates. It can be concluded that foliar application of the biostimulant improves cotton performance, with recommended application rates ranging from 600 to 800 mL ha⁻¹. Editor: Instituto Federal Goiano Tipo: Artigo de Periódico Wed, 01 Apr 2026 00:00:00 GMT https://repositorio.ifgoiano.edu.br/handle/prefix/6628 2026-04-01T00:00:00Z