Revista de Ciencias Agrícolas <p align="justify">The Revista de Ciencias Agrícolas is a recognized means of divulgation and distribution of scientific and technological research nationwide and abroad, biannually publishes original articles written in Spanish, English and Portuguese, on topics related to Agricultural Sciences, which present in detail results of research in agriculture, forestry, agricultural biotechnology and food which are subject to the assessment process by nationals and foreign peers, and to review and approval by the Editorial Committee of the magazine.</p> <p><strong>DOI:</strong>&nbsp;<a href="" target="_blank" rel="noopener"></a></p> <p>&nbsp;</p> en-US (Tulio César Lagos Burbano) (Leydy Martínez) Thu, 18 Jul 2019 00:00:00 -0500 OJS 60 Fumigant toxicity of eugenol and its negative effects on biological development of Callosobruchus maculatus L <p>The protection of stored products from insect damages, when accomplished, is mostly relying on the application of synthetic insecticides with serious health and environmental issues in addition to risks of selection of resistant insect populations associated with such practice. The use of plants derived compounds have been presented as sound strategy for sustainable insect pest management. Eugenol is an aromatic component of natural occurrence in essential oils of numerous plants. known for its repellent and insecticidal bioactivities against different insect species. Here, we investigated the fumigant application of eugenol to control the cowpea weevil <em>Callosobruchus maculatus </em>(Coleoptera: Chrysomelidae: Bruchinae) by assessing toxicity, effects on biological development (including emergence inhibition) and repellency to these weevil. Besides a good fumigant insecticidal activity, eugenol exposure resulted in&nbsp; a dose-dependent decrease of&nbsp; the growth rate of <em>C</em>. <em>maculatus</em>&nbsp; associated with a steady reduction in bean mass losses. Additionally, inhibition of offspring was upper 50% when adults were exposed to lethal and sublethal concentrations. significant inhibition of the offspring emergence was achieved after the exposure of parental adults to lethal and sublethal doses of eugenol. Furthermore, adult weevils were repelled away from beans exposed to high dose (LD<sub>99</sub>) of eugenol in contrast with their attraction to the beans treated with lower dose (LD<sub>50</sub>). &nbsp;Our findings suggest that eugenol has potential as control tool to be used in sustainable management startegies of <em>C. maculatus.</em></p> Maria José González A., Luis Viteri Jumbo, Lêda Rita D'Antonino Faroni, Eugenio Eduardo Oliveira, Adolfo Fernando Flores, Fernanda Fernandes H., Khalid Haddi ##submission.copyrightStatement## Sun, 16 Jun 2019 00:00:00 -0500 Edaphoclimatic factors in the production and quality of Saboya grass (Holcus lanatus L.) in the highland of Nariño <p>Dairy farming in the department of Nariño depends mainly on the availability of forage. In this regard, the nutritional quality and production of this resource are affected by climatic conditions. This research aimed to establish the incidence of edaphoclimatic factors on the production and quality of Saboya grass (<em>Holcus lanatus</em> L.) in the highland of Nariño. The study was conducted in three zones: zone 1) three towns of the municipality of Guachucal located at 3050-3300 m.a.s.l; zone 2) three towns of the municipality of Ipiales at 2800–3049 m.a.s.l.; zone 3) three towns of the municipality of Pasto at 2500-2650 m.a.s.l. We sampled Saboya grass plots without tillage where we measured climatic, agronomic, edaphic, and bromatological variables in order to determine the degree of correlation among them. The quantitative variables were analyzed through principal component analysis (PCA) and the qualitative variables through a multiple correspondence analysis (MCA). We concluded that the highest yield of Saboya grass (<em>H. lanatus</em>) at an altitude between 2800 and 3049 meters requires loose soil, an organic matter content of 5-6%, and a pH of 6 to 7. In addition, this grass grows (<em>H. lanatus</em>) well at a temperature of 10°C, 83% relative humidity, 800 to 900 mm of annual rainfall, and 25 klx of luminosity. On the other hand, at an altitude range of 3050-3300 meters above sea level, Saboya grass requires loose soil, an organic matter content over 10%, and pH of 5 to 6. It is well-adapted to a temperature of 10 to 12°C, 86.28% relative humidity, and rainfall of 923 mm per year.</p> Edmundo Apráez, Arturo Gálvez, Julian Apraez ##submission.copyrightStatement## Sun, 16 Jun 2019 00:00:00 -0500 Evaluación de modelos aplicados a la producción de materia seca de Brachiaria brizantha en el periodo lluvioso <p>In this paper nonlinear models used to describe growth dynamics of plants based on dry matter production of <em>Brachiaria brizantha</em> CV<em>. </em>Toledo at different cutting ages and under nitrogen fertilization in rainy season were compared, which allowed establishing equilibrium points, study of monotony and concavity. Results showed the four models are related to the A constant relative to dry matter maximum yield. Balance points are affected by factors linked to the crop development. In drought conditions Gompertz model shows a weakness compared to the others, so its use would be restricted in such climatological conditions. Von Bertalanffy and Brody models lack a inflection point, so in trials where the inflections presence is presumed in dry matter production, its implementation is not convenient. It is possible suggest logistic model use in drought conditions, while in rainy season, use a logistic or Gompertz model is subject to the previous accomplishment of a covariance analysis. Nitrogen fertilization, cutting age, intrinsic growth rate of <em>B. brizantha</em>, as well as other factors affect this species development determine dry matter production sustainability.</p> Danny A. Villegas R., Nora Valbuena, Manuel E. Milla P. ##submission.copyrightStatement## Sun, 16 Jun 2019 00:00:00 -0500 Participatory assessment of the mixed homegardens, its use and management <p>The lack of knowledge communities have about species in their mixed homegardens, as well as the little value they give to their uses, led to develop the research that took place in the village of Concepción Alto, a town in the municipality of Pasto, located at 1.09º8`8 "of latitude; -77º30`11" of longitude and with &nbsp;2520 masl. The purpose was to collect, evaluate and systematize the use and management of the species that make up the homegardens, 10 families as key informants were selected, being necessary to stratify them to determine which stratum had the highest knowledge; a semi-structured interview was applied. Knowledge analysis was carried out using the AKT 5 (Agroecological Knowledge Toolkit) methodology. Among the evaluated variables, the outstanding were the specific use of the species, type of management and coefficient of importance, a statistical analysis (Student t test) complemented with their correlation with the variables: age, education, and the number of sentences. To analyze the information the R statistical software was used. The results indicate that the knowledge between the strata I (µ=94±27), II (µ=127±22) and III (µ=75±13) showed no statistically significant differences (p-value=0.3988 &gt;0.05), meaning that all sections share similar knowledge, obtaining a negative correlation between the variables of age and number of phrases (r = -0.31). About the homegardens´ use highlight medicine, food, fodder, fuelwood, timber, shade and water regulation. The homegarden management is conditioned by the experience, beliefs, and new acquired knowledge. In this sense, mixed homegardens in the village of Conception Alto, are a reservoir of plant biodiversity and knowledge.</p> Miriam Guapucal Cuasanchir, Ximena Sthefania Benavides C., Kelly Xiomara Sinisterra ##submission.copyrightStatement## Sun, 16 Jun 2019 00:00:00 -0500 Effect of bioproducts in the production of Phaseolus vulgaris L. and Arachis hipogea L. <p>The agrochemical inadequate use to increase the plants yield, is not an environmentally friendly practice. For this reason, the research objective was to evaluate the effect of efficient-microorganisms and chitosan on growth and yield of <em>Phaseolus vulgaris</em> L and <em>Arachis hipogea</em> L. An experiment was established in field at Bayamo municipality, Granma province in the period October/2016 and February/2017. Chitosan (Q) and efficient-microorganisms (EM) alone and combinations were evaluated on the growth and yield of <em>P. vulgaris</em> and <em>A. hipogea</em>. For it, a design of randomized blocks with four replies it was established and an ANOVA and Duncan´s test (p≤0.05) it was used. The results showed that Q+EM combination potentiated the growth and yield of peanuts and bean plants. With Q+EM were obtained the bigger values of gynophores/plant, seeds/plants and weight/100 seeds. Thus, the chitosan + efficient-microorganism’s combination, rise as an biofertilization efficient alternative in the sustainable production of bean and peanuts.</p> Tania Lambert G., Ramón Santiesteban S., Wilson Geobel Ceiro C., Manuel Enrique Fernández P., Guadalupe de las Mercedes López C., Wilson Cristobal Corrales M. ##submission.copyrightStatement## Sun, 16 Jun 2019 00:00:00 -0500 Evaluation of efficient microorganisms in the tomato seedling production (Solanum lycopersicum L.) <p>The main problems of the production of tomato seedlings in the tropical regions reside mainly by the affectation by climatic factors and the low use of biofertilizers, for which, it is important to look for efficient alternatives of biofertilizers management in these regions that increases the rationality and sustainability. The objective of the work was to evaluate different application forms of efficient microorganisms in the tomato seedlings production. The randomized block design was used, in a 4x3 factorial scheme, the plot size was 2m<sup>2</sup> and the studied factors were: the application of efficient microorganisms (EM) in four levels: sin (0), seed inoculation at 100mL L<sup>-1</sup> (S), foliar applications at 100mL L<sup>-1</sup> (F) and the combination of seed inoculation with foliage applications (S + F) and three tomato varieties (Amalia, Rilia and Seen-2), with three replications. Were evaluated the fallowing indicators: the emergence percentage (%), stem diameter (cm), plant height (cm), number of leaves, yield (seedlings m<sup>-2</sup>) and the seedling production cycle (days). The results showed that, in the three tomato varieties, the combinate treatment of seeds inoculation with foliage applications of efficient microorganisms increased the stem diameter, plant height, number of leaves and yield in the Amalia and Rilia varieties by 26%, and Seen-2 by 25% with relation to the control and the seedling production cycle was reduced in Amalia and Seen-2 varieties by 24% and Rilia by 22%.</p> Alexander Calero H., Elieni Quintero R., Yanery Pérez D., Dilier Olivera V., Kolima Peña C., Iván Castro L., Janet Jiménez H. ##submission.copyrightStatement## Sun, 16 Jun 2019 00:00:00 -0500 Physical characterization of soil aggregates submitted to 10 years-old of application of swine manure <p>Successive applications of swine manure can promote changes in soil physical attributes, with emphasis on the soil aggregation pathways. The objective of this work was to separate and quantify the aggregates according to their training path and to evaluate the stability of these aggregates in an area with a history of applications of pig slurry (PS) and deep litter (DL) in no-tillage system (NTS). After 10 years of use swine manure (SM) in oat/corn succession under NTS, undisturbed soil samples were collected in the 0-5 and 5-10 cm layers, in the treatments without SM (control), with application of PS and DL at doses equivalent to one and two times the recommended N for corn and oats (PS1X, PS2X, DL1X and DL2X, respectively). The aggregates were separated according to their morphological patterns and biogenic and physicogenic formation pathways. Then, weighted average diameter (WMD) of the aggregates and the distribution of the aggregates in the diameter classes for macroaggregates (8.0&gt;Ø ≥2.0 mm), mesoaggregates (2.0&gt;Ø ≥0.25 mm) and microaggregates (Ø&lt;0.25 mm) in each type of aggregate were evaluated. The addition of SM increased the formation of biogenic aggregates. In the control area, the formation pathway of physicogenic aggregates prevails. The application of PS did not alter the WMD and the macroaggregates in relation to the control, while the application of DL increased these parameters when compared to the PS and control treatments.</p> Carlos Aristeu Mergen Junior, Arcângelo Loss, Elano Dos Santos Junior, Lucas Dupont Giumbelli, Daniela De Pinho De Pinho, Lucinéia De Abreu, Cledimar Rogério Lourenzi, Jucinei José Comin, Gustavo Brunetto ##submission.copyrightStatement## Sun, 16 Jun 2019 00:00:00 -0500 A hammer mill power evaluation from sugarcane bagasse processing <p>The Panela production is an important item of the Colombian economy. This agricultural industry has a low technification and uses mechanically inefficient machines that cause high- energy consumption. This work aims to check the power consumption of a hammer mill during the sugarcane bagasse processing. A Voltiamperimetric clamp recorded the current, voltage and phase angle information for a period, simultaneously adding controlled loads of bagasse at regular intervals. It was found that there is a relationship between the load and the power consumption, which was adjusted by a quadratic model whose correlation coefficient is 0.99.</p> Sneider Alejandro Gil P., Albeiro Espinosa B. ##submission.copyrightStatement## Sun, 16 Jun 2019 00:00:00 -0500 Saccharum officinarum L. waste breakdown and the fertilizing effect on Raphanus sativus L. <p>The agroindustry of the Panela generates a high pollutant load which is represented by liquids, gases and solids. Among the most polluting solid wastes, the sugarcane bagasse is the one that generates the most environmental impact because it is poured directly into the ravines, triggering serious conflicts in the social and economic order. The objective in this research was to obtain organic fertilizers, from the sugar cane residues, adding microbial broths which were enriched with fertilizers. Five treatments were evaluated. They included compost, microbial broth, nitrogen additions, phosphorus and a fully randomized control with three replicates. The physical and chemical variables were determined from the organic fertilizer, besides the fertilizer effect in <em>Raphanus sativus</em> L plants. The microbial broth application on the sugarcane bagasse allowed to obtain a good organic fertilizer content which was full of nitrogen, phosphorus, potassium, calcium and magnesium. From the enriched organic fertilizer application, in doses of 2 and 4 t/ha-1, a greater length of the aerial part of <em>R. Sativus</em> was obtained, which resulted in greater weight of the aerial part but also from the radical part.</p> Jorge Vélez-Lozano, Hernán Burbano-Orjuela, Jorge Fernando Navia E., Eyder Daniel Gómez L. ##submission.copyrightStatement## Sun, 16 Jun 2019 00:00:00 -0500