Ciencias Agropecuarias

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    Efecto de tres fuentes y tres dosis de potasio en el rendimiento de papa china, cultivar “blanca” [Colocasia esculenta (L.) schott] en la parroquia El Triunfo, provincia de Pastaza
    (2021-04) Pineda Morales, Noé Efraín; Leiva Mora, Michel
    The objective of this work was to determine the effect of sources and doses of K+ on the agricultural yield of Chinese potato, cultivar "white", because there is no history of similar studies in our country. During the experimental field phase at harvest time (210 days after planting, dpp) the following variables were evaluated: weight of cormels per plant, quality categories of cormels (first-class cormels 100 - 200 g, second 50 - 100 g and third less than 50 g), number of cormels per plant, weight of cormels per category and yield of cormels per hectare, benefit-cost ratio-1 (BC-1). All the sources of potassium increased agricultural yield, although the KNO3 fertilization source was the one that showed the greatest increase. When 99.6 g. plant-1 of KNO3 were applied, the highest quantity of cormels of C. esculenta cultivar “blanca” was obtained with first-rate quality. The fertilization treatment based on the application of 49.9 g. KCl's plant-1 was the one that generated the highest profit per dollar invested. However, in all treatments that used potassium sources, the profit was increased when compared to the control without fertilization. Profits ranged from US $ 0.3 to US $ 1.1 per every dollar invested.
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    Comportamiento productivo en la engorda de tilapia gris alimentadas con dietas a base de Colacasia esculenta en el Puyo Ecuador
    (2016) Guerrero Moya, Grace Gabriela; Barros Rodríguez, Marcos Antonio
    In the province of Pastaza, Puyo, Km 6 Via August 10, 1440 the productive performance of tilapias fed with different proportions of potato leaf China in the growing stage was evaluated. Tilapia were distributed in 2 tanks divided into 24 compartments with 4 treatments and 6 replications, under a completely randomized design (DCA), the treatments were: T1 (commercial feed), T2 (20% HPC), T3 (30% HPC) and T4 (40% HPC). The parameters evaluated were: length and initial and final weight, weight gain / day (g), Daily Growth (mm / day), FCR, Profitability and cost / benefit ratio. The test duration was 60 days. In weight gain no significant differences (P = 0.0950) between treatments maintaining a range between 5.81 to 6.17 g / day gain. The daily growth of tilapia was observed that the greatest growth was in Q4 (0.20 mm / day) being different (P = 0.0084) at T1 (0.10 mm / day). The best feed conversion no significant differences (P = 0.1952) while maintaining a range of 2.41 to 2.54. With respect to profitability and cost / benefit ratio indicated that T4 was higher with 33,40% of profitability and benefit / cost ratio was 1.50. The results suggest that the use of leaf Papa China, which is an important industrial waste could have a potential use in food processing for Tilapia.