Examinando por Autor "Silva Valqui, Gelver"

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Characterization of Coffea arabica L. parent plants and physicochemical properties of associated soils, Peru
(Cell Press, 2022-10-03) Alvarado Chuqui, Wigoberto; Bobadilla Rivera, Leidy Gheraldine; Valqui Valqui, Leandro; Silva Valqui, Gelver; Valqui Valqui, Lamberto; Vigo Mestanza, Carmen Natividad; Vásquez Pérez, Héctor Vladimir
It is important to carry out the morphological characterization of coffee parent plants and the physicochemical properties of the associated soils in the Amazon region, Peru, in order to achieve germplasm conservation. One hundred coffee mother plants were identified and located in five provinces of the region and evaluated according to morphological descriptors such as stipula shape, young leaf color, leaf shape, leaf apex shape, young shoot color, leaf color, fruit color, fruit shape, mature leaf color, and rust incidence percentage. In the plots where the parent plants were located, soil sampling was carried out to determine the physical and chemical properties. The varieties with the greatest presence in the five provinces were Típica and caturra roja, with the greatest number of specimens reported for the province of Bagua. The predominant stipule shape was triangular (91%), lanceolate leaf shape (60%) and red fruit color (90%). Bongará reported the lowest incidence of yellow rust, as well as the Mundo Novo Rojo variety. Soil pH ranged from acidic to neutral values, low electrical conductivity, high organic matter content, low phosphorus content, high potassium levels and medium cation exchange capacity. The predominant textural class was sandy loam. The physical and chemical characterization of the soils under study show favorable ranges to encourage the best development of coffee cultivation.
Clonal Propagation of Coffea arabica with Indole Butyric Acid and Acclimatization Conditions in Amazonas, Peru
(Hindawi, 2021-10-06) Chichipe Oyarce, Jardy; Camacho Villalobos, Alina Alexandra; Bobadilla Rivera, Leidy; Vigo Mestanza, Carmen Natividad; Vásquez Pérez, Héctor Vladimir; Silva Valqui, Gelver
The use of hormones is important in improving the propagation process. The objective of the experiment was to identify the best dose of indole butyric acid (IBA) hormone for the rooting of coffee cuttings of the typical variety through clonal propagation in the Amazon region. The experiment was carried out in two stages. Both stages were carried out under a Completely Randomized Design (CRD). The percentage of rooting of cuttings and the number of roots were evaluated. The coffee tree clones were collected from rust tolerant elite plants. In the laboratory, the cuttings were immersed for 10 minutes in fungicide and then in five doses of IBA hormone (1000, 1500, 2000, 2500, and 3000 mg L−1) of IBA. They were then placed in a microtunnel. With the best dose obtained in stage 1 of IBA (T4: 2000 mg L−1), which achieved a rooting percentage of 52.50% and 5.8 roots on average, stage 2 was installed for the evaluation of acclimatization conditions (greenhouse and nursery). Thirty plants of the Típica variety were evaluated per treatment. Regarding the results after 90 days, the greenhouse obtained the highest values with 72.22% survival, a plant height of 9.48 cm, 4.32 mm stem diameter, 6.53 leaves per plant, 9.65 cm leaf length, and 3.83 cm leaf width. The IBA hormone in a controlled environment such as the greenhouse achieves good vegetative propagation for the Típica variety.
Effect of pruning height and organic fertilization on the morphological and productive characteristics of Moringa oleifera Lam. in the Peruvian dry tropics
(Walter de Gruyter GmbH, 2024-06-18) Yalta Vela, Juan; Silva Valqui, Gelver; Ampuero Trigoso, Gustavo; Quispe Ccasa, Hurley Abel; Saucedo Uriarte, José Américo
The objective of the study was to evaluate the effect of pruning height (PH) and organic fertilization dose (FD) on the morphology and productive characteristics of Moringa oleifera Lam. We germinated seeds collected from 10-year-old shrubs, and 2-month-old seedlings were transplanted in the final field. We used a two-factor design of PH (PH1:0.4, PH2:0.8, and PH3:1.2m from the ground) and FD (FD0:0, FD1:500, FD2:750, and FD3:1,000 g of decomposing goat manure). We carried out an initial pruning 4 months after transplanting and the harvests every 45 days. After three consecutive harvests, PH3 improved N° branches (12.53 ± 3.09) and dry matter (21.98 ± 1.30%), but PH1 showed greater stem lengths (1.65 ± 0.24 m) (p < 0.01). There was no difference in the stems and leaf weights between PH2 and PH3, and no trait varied according to FD (p > 0.05). The PH × FD interaction can improve the plant diameter (p < 0.01) and dry matter (p < 0.05) with PH2 (56.79 ± 3.71 mm) and PH3 (23.20 ± 1.04%) from FD1. We found an increasing trend in N° branches, plant diameter (p < 0.01), and the leaf–stem ratio. However, in the third harvest, the biomass production trend was downward for a short period for an adequate replacement of nutrients from the incorporated organic fertilizer. It is recommended to prune M. oleifera at 1.2m from the ground to stimulate greater biomass and maintain the leaf–stem ratio throughout the evaluated harvests and apply more than 500 g of goat manure after each harvest to restore the nutrients extracted from the soil.
Influencia de sustratos y concentraciones de ácido indol butírico en la propagación vegetativa de Cinchona officinalis L. (quina) en Amazonas, Perú
(Universidad de Pinar del Río “Hermanos Saíz Montes de Oca”, 2020-07-03) Sánchez Santillán, Tito; Silva Valqui, Gelver; Chichipe Puscan, Ariel Kedy; Trigoso Pinedo, Marcial; Bobadilla Rivera, Leidy; Jiménez Yoplac, Geidy
La investigación tiene por objetivo evaluar la influencia de sustratos y concentraciones de ácido indol butírico (AIB) en la propagación vegetativa de Cinchona officinalis L. (quina) en Amazonas, Perú. Se utilizó un diseño completo al azar con arreglo factorial, de 3A x 4B, dónde factor A: sustratos (arena, arena 50 % + turba 50 % y turba) y factor B: concentración de AIB (0, 1, 2, 3 g.L-1). El trabajo se desarrolló en dos fases, en campo se colectaron ramas ortotrópicas juveniles de árboles plus del bosque de neblina San Jerónimo en Perú, ubicado a 2616 metros sobre el nivel del mar. La fase de vivero, se desarrolló en el centro experimental de la Universidad Nacional Toribio Rodríguez de Mendoza-Amazonas. Las ramas juveniles colectados de campo fueron uniformizados a 7 cm, dejando dos hojas con 50 % de área, se desinfectaron con fungicida Propineb 70 % 3 g.L-1 de agua. Se encontró que los sustratos influyeron significativamente, sobresaliendo el sustrato arena en la sobrevivencia y arena+turba mostró superioridad en el enraizamiento, número y longitud de raíces. Concentraciones de 2 y 3 g.L-1 de AIB, estimularon la emisión radicular e incrementaron el número y tamaño de raíces. Los sustratos y concentraciones de AIB influyeron positivamente en el enraizado de ramas juveniles de C. officinalis en condiciones ambientales controladas