Special issue · 2023
Vol. 39, Sp. Iss. 2
19 articles · All issues →
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorPlant Diversity and Characterization of Urban Green Spaces in Portoviejo, ManabÃ-Ecuador
Gema Damaris Meza-Ibarra, Cristhofer Yandry Valle-Carreño, Felipe R. Garcés-Fiallos, Carlos A. Salas-Macías
Plants offer cultural and scenic beauty, which has enriched urban environments throughout history. Although green spaces are crucial for the entire population, researchers have conducted little research on them in Ecuador. Therefore, our study characterized th…
16 Oct 2026DOI 10.17582/journal.sja/2023/39/s2.189.204
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorEffect of Garlic Extract (Allium sativum) as a Preservative in a Fermented Kefir Type Dairy Drink
Plinio Vargas Zambrano, Luis Vásquez Cortez, Julio Ibarra Arteaga, Camilo Chávez Ceballos, Ramona Párraga Alava
Natural preservatives are widely used in the food industry since they have the ability to preserve or to be an antioxidant, but with the great difference that they are not harmful to health. Garlic with its compounds become a preservative agent, therefore, the…
2 Sept 2024DOI 10.17582/journal.sja/2023/39/s2.80.92
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorSustainable Maize Production by Organic Amendment – A Field Study from Ecuadorian Coast
José J. Cedeño-Díaz, Caridad A. Torres-García, Marina García, Freddy Zambrano-Gavilanes, Naga Raju Maddela, Felipe R. Garcés-Fiallos
The study aimed to evaluate the effects of the application of organic fertilizers such as caster seed cake (Ricinus communis L.), physic nut seed cake (Jatropha curcas L.), and vermicompost on seedlings and adult plants of INIAP H-603 maize under semi- control…
3 Nov 2024
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorEffects of Organic and Chemical Fertilization on Pepper (Capsicum annuum L.) in a Semi-Protected Cropping System
Mayra Falcones-Vélez, Robinson Pachay-Santana, Caridad A. Torres-García, Liliana Corozo-Quiñonez, Francisco J. Arteaga-Alcívar, Silvia Velecela- Abambari et al.
This study exposes a comparative analysis between organic and chemical fertilization on pepper (Capsicum annuum L.) in a semi-protected cropping system. To this end, four organic and one chemical treatment were applied. The response variables were plant height…
13 May 2025
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorScolytines (Coleoptera: Curculionidae: Scolytinae) Associated with Cacao Monoculture and Agroforestry Systems
Jessenia Castro-Olaya, Dorys T. Chirinos, Takumasa Kondo
Cacao, Theobroma cacao L. has a diverse entomofauna, including the scolytines. During March - August 2021, the scolytinae community was studied in Manabí province, Ecuador. Two farms in agroforestry (AF) and monoculture system (MF) were selected in thre…
3 Nov 2024
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorÂPhysicochemical Factors Affecting Nitrogen Mineralization in Soil Cultivated Tropical Pastures
Gerardo J. Cuenca-Nevárez, Juan Carlos Menjivar-Flores
At present, there are no reliable criteria for how much nitrogen fertilizer to add in pasture soils, so it is important to improve the efficiency of nitrogen (N) fertilizer use in pasture soils. It is therefore necessary to identify a fast and reliable soil N…
10 Feb 2025DOI 10.17582/journal.sja/2023/39/s2.129.138
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorCharacterization of Edible Films Based on Cordia lutea Lam
Marlon Reinaldo Castro-García, Vanessa Gabriela Espinoza-Posligua, Francisco Horley Cañarte-García, Doris Fernanda Rizzo-Alcivar, Christian Simón Rivadeneira-Barcia, Alex Alberto Dueñas Rivadeneira
Consuming healthy and good quality foods has promoted the development of new conservation technologies, such as edible coatings. The aim of the present study was the characterization of Cordia lutea gum films. The films were prepared by heating gum-water solut…
18 Aug 2024DOI 10.17582/journal.sja/2023/39/s2.70.79
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorPhysicochemical, Antioxidant and Beta-Carotene Evaluation of Flours Obtained from Squash Pulp (Bermellon, Pepo and Macre)
Wagner Antonio Gorozabel Muñoz, Mayra Jossenka Loor Solórzano, Josselyn Gema Palacio Intriago, Virginia Vanessa Andrade Andrade, Carlos Alfredo Cedeño-Palacios
In the quest for new food options for consumers, there has been a proposal to add value to a raw material that is underutilized by the Ecuadorian industry, such as squash. This was accomplished by evaluating its properties and conducting physicochemical, antio…
2 May 2024DOI 10.17582/journal.sja/2023/39/s2.55.61
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorAnthocyanins, Intestinal Health and Productive Response in Broiler Chickens
José Arteaga, Juan José Toro-Letelier, Sixto Reyna
Broilers are the main source of animal protein for human consumption, and since the mid-twentieth century, their productive efficiency has been supported by the inclusion of sub-therapeutic doses of antibiotics as growth promoters (AGPs) in their diets. Howeve…
13 May 2025DOI 10.17582/journal.sja/2023/39/s2.173.188
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorAnatomy of the Photosynthetic Cladodes of Prickly Pears (Opuntia ficus-indica (L.) Mill.) Plants
Adriana Beatriz Sánchez-Urdaneta, Gisela del Carmen Rivero-Maldonado, Cecilia Beatriz Peña-Valdivia, Dianelis del Carmen Sánchez-Urdaneta
Plants of Opuntia have modified stems, which are called cladodes, and are specialized structures able to photosynthesize. This study was conducted in order to compare the anatomy of the cladodes of the fruit-producing cultivars Floreadora, Moradaza, and Solfer…
26 Feb 2024DOI 10.17582/journal.sja/2023/39/s2.1.9
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorApplication Frequency and Dosage of Mepiquat Chloride as a Growth Regulator for Coker Cotton Variety in Ecuador
Luis Fernando Díaz-Toral, Carlos Eddy Alvarado-Zamora, Ernesto Gonzalo Cañarte-Bermúdez, José Bernardo Navarrete-Cedeño, Gilmar Jesús Cañarte-Cañarte, Fernando David Sánchez-Mora
The aim of this research was to determine the appropriate time and dose of application of mepiquat chloride (MC), as a plant growth regulator (PGR), in the Coker cotton commercial variety. This field trial was carried out during February-August 2020 in La Teod…
17 Apr 2024DOI 10.17582/journal.sja/2023/39/s2.37.47
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorMorphological Variation of Theobroma cacao L. Affected by Increasing Doses of Heavy Metals
Robinson Torres Ronquillo, Manuel Carrillo Zenteno, Wuellins Durango Cabanilla, Diego Franco Ochoa, César Quinaluisa Morán, Seyed Mehdi Jazayeri et al.
The objective was to determine the effects on morphological changes in cocoa plants (EET-103 clone) due to the effect of increasing doses of heavy metals (HMs): Mercury (Hg), Lead (Pb), Copper (Cu), Cadmium (Cd). Through seven treatments with four replications…
10 Feb 2025DOI 10.17582/journal.sja/2023/39/s2.139.144
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorPerformance of the Cotton Variety BRS-336 Under Different Seed Densities
Gilmar Jesús Cañarte-Cañarte, Ernesto Gonzalo Cañarte-Bermúdez, José Bernardo Navarrete-Cedeño, Luis Fernando Díaz-Toral, Carlos Eddy Alvarado-Zamora, Fernando David Sánchez-Mora
This research was done to measure the effect of spacing between rows and plants on the growth, development, and production of the cotton variety BRS-336. Twelve plant densities were used: 55 556, 37 037, 27 778, 50 000, 33 333, 25 000, 45 455, 30 303, 22 727,…
17 Apr 2024DOI 10.17582/journal.sja/2023/39/s2.19.26
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorPhysico-Chemical Characterization of Maqueño Banana (Mussa acuminata) Fruits
Diego Armando Tuárez García, Hernán Humberto Chevez Véliz, Luis Humberto Vásquez Cortez, Kerly Estefanía Alvarado Vásquez, Jaime Fabián Vera Chang, Cynthia Yadira Erazo Solorzano et al.
The banana (Mussa acuminata) is a fruit native to Asia and has been a staple food for centuries due to its high nutritional value and versatility. The Maqueño banana “Red Dacca” is a unique variety with a reddish-purple skin, smaller size, a…
10 Mar 2025DOI 10.17582/journal.sja/2023/39/s2.145.152
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorExtraction of Cocoa Powder for the Preparation of a Drink by Adding Mucilage and Guava
Jaime Vera Chang, Arianna Torres Coronel, Luis Vásquez Cortez, Kerly Alvarado Vásquez, Frank Intriago Flor
The objective of this research was to prepare a drink based on mucilage and cocoa powder infected with 25% of Moniliophthora roreri (monilla), adding a tropical fruit such as Guava (Psidium guajava L.). A completely randomized design was applied, with five tre…
26 Feb 2024DOI 10.17582/journal.sja/2023/39/s2.10.18
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorComposition and Tree Structure of a Dry Forest Fragment in the Ecuadorian Coast
Jimmy Alexander Vinces-Aguayo, Alex Mora-Arcentales, Anthony Narvaéz-Calderon, Paola Alcívar-Vaca, Adrián Murillo-Choez, Carlos Salas-Macías
The goal of this research was to determine the composition and tree structure of a dry forest fragment on Ecuador central coast. The DRYFLOR protocol was used on a 5000 m2 plot with 10 x 10 m subplots. Data on diameter at breast height (DBH) of individuals wit…
13 May 2025DOI 10.17582/journal.sja/2023/39/s2.164.172
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorCharcoal Rot on Cotton in Ecuador: Symptoms, Etiology and Management with Seaweeds
Frank G. Cedeño-Lozano, Freddy Zambrano-Gavilanes, Felipe R. Garcés-Fiallos
In this work, the effect of commercial algal extracts was examined based on Ascophyllum nodosum, Sargassum spp., and Spirulina spp. on the incidence of dead plants (%), Area Under the Disease Progress Curve (AUDPC) concerning that variable, severity (%) of rot…
10 Feb 2025DOI 10.17582/journal.sja/2023/39/s2.118.128
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorTrichodina heterodentata (Ciliophora: Trichodinidae) Parasitizing Piaractus brachypomus Cultivated in Ecuadorian Amazon
Yanis Cruz-Quintana, Ana María Santana-Piñeros, Byron Manuel Reyes-Mero, Leonela Griselda Muñoz-Chumo, Lenin Cáceres-Farías
Ectoparasitic protozoa of the genus Trichodina are considered one of the main pathogens affecting cultured fishes, mainly in small organisms or early ages. However, its incidence and effects on Amazon traditional aquaculture species such as Piaractus brachypom…
19 Apr 2024DOI 10.17582/journal.sja/2023/39/s2.48.54
Specail Issue: Memories of the Agricultural and Livestock Area of the VI CCIUTM, EcuadorInfluence of Tree Shade on the Growth and Chlorophyll Content of Arabica Coffee Plants Established in an Agroforestry System at Southern ManabÃ, Ecuador
Julio Adolfo Corzo-Bacallao, Carlos Alfredo Salas-Macías, Osvaldo Fonseca-Rodríguez, Felipe R. Garcés-Fiallos, Erika Isabel Alcívar-Muñoz, Henry Fabricio Baque-Loor
The experiment was developed under production conditions on a farm in the Santa Ana city, south-central region of the province of Manabí, Ecuador, in a mountainous area of approximately 300 meters above sea level. Coffee (Coffea arabica, sp.) production…
17 Apr 2024DOI 10.17582/journal.sja/2023/39/s2.37.47