Revista de Ciencias Agrícolas 2020-07-31T00:01:39-05:00 Tulio César Lagos Burbano Open Journal Systems <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 english, 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> Effect with organic acid supplementation on productive and reproductive parameters in guinea pigs 2020-07-03T16:03:09-05:00 Siever Miguel Morales Christian Arturo Arturo Vela <p>Guinea pig production systems demand organic alternatives to improve their productivity, due to the increased demands of this type of livestock production. The objective of the present study was to evaluate the effect of organic acids on the productive and reproductive indices in breeding guinea pigs in an intensive breeding farm in Lima. 60 pools with 10 guinea pigs in each one (9 females and one male) were used and they were randomly divided into 4 treatment groups, T1: 1mL / L, T2: 2mL / L, T3: 4mL / L; all with 15 pools in total (5 pools each with a dosage of 5 days, 10 days, and 15 days, respectively), and T4: Control (15 pools without dosage); the observation period was 3 months. No significant difference (p&gt; 0.05) was found between treatments for weight gain, percentage of maternal mortality, percentage of abortions, percentage of pregnancy, number of pups born and percentage of viability. For the percentage of mortality of kittens and average weight at birth of the offspring, a significant difference was found (p &lt;0.05), showing that T3 reached a higher weight index at birth of offspring (T3: 147.7 / 142.7 / 146.8 g) and lower mortality rate in kittens (T3: 0 / 1.8 / 3.0%). No significant difference was found in terms of dosing days. It is concluded that the supplementation with organic acids with T3 (4mL / L) improved the weight at birth of the offspring and the percentage of mortality in kittens.</p> 2020-06-20T00:00:00-05:00 ##submission.copyrightStatement## Water quality index using fuzzy logic Utcubamba River, Peru 2020-07-03T22:45:45-05:00 Lenin Quiñones Luis Ochoa Manuel Emilio Milla José Federico Bazán Oscar Andrés Gamarra Jesús Rascón <p>Water is a fundamental nutrient in the life of any living being. Therefore, it is necessary to estimate its quality, because it is an issue that increasingly concerns countries around the world for reasons such as the health of the population, regional, national and international economic development and the environmental quality of the ecosystems A tool that is being used to know the state of the water is the water quality indexes (WQI). The objective of this research was to development an ICA based on fuzzy logic, which allows to estimate water quality. The methodology that has been used was proposed by Icaga (2007). To evaluate the WQI called "Diffuse Water Quality Index" (DWQI), sixteen sampling points were used by the Research Institute for Sustainable Development during October 2014 on the Utcubamba River and its tributaries. To validate the index, it was necessary to estimate the correlation coefficient R<sup>2</sup> between the results obtained with those of the Water Quality Index NSF WQI reported by the Water Research Center. This new index presented results and reasonable correlation, R<sup>2</sup> = 0.81. It is concluded that DWQI can be used as a tool for decision making in the water management of the Utcubamba River.</p> 2020-06-20T00:00:00-05:00 ##submission.copyrightStatement## Savanna sandy loam soil physical conditions impacts upon infiltration 2020-07-30T21:54:13-05:00 Américo J. Hossne G. Pedro Antonio Vásquez Escáriela Josefina Smith Luis Mercedes Leiva <p>This work focused on studying Kostiakov infiltration affected by wetness, depth, compaction and density. Physical properties perturbations effects on infiltration-Kostiakov interrelations. The objectives consisted finding the effects of compaction, depth, density and wetness upon infiltration, the influence of the relationship between density and wetness and the soil physical effects upon Kostiakov. Nine &nbsp;cylinders of 15.24 cm diameter and 20 cm height, with 2.50 soil-kg/cylinder, analyzed with a randomized block design with three replications and three factors: wetness (3, 6, 9, 12, 15%), depth (0-15, 15-30, 45-60 cm), and three compaction levels (0, 13, 26 blows). For optimal of 8.45% wetting, 27.66 cm depth, 1.56 and 0.52 g/cm<sup>3</sup>, 0 and 13-26 compaction blow; the infiltrations were 18.77, 16.32, (0.01 and 56.8), and (24.38 and 0 tendency)&nbsp; accordingly. Conclusion: infiltration, compaction and bulk density relations were inversely. Compaction most influenced infiltration, following depth and wetness up to 9%.</p> 2020-06-28T00:00:00-05:00 ##submission.copyrightStatement## Agronomic performance Raphanus sativus L. cultivars under different spacing 2020-07-30T22:37:28-05:00 Jorgeana Francis Alvim Oswaldo Sobrinho Erika de Kássia Cantanhede Álvaro Pereira Valdelânia Gomes da Silva Leonardo Silva dos Santos <p>In order to optimize the production of radish (Raphanus sativus L.) an ideal spacing must be established since the spatial arrangement in which plants are found in the cultivation area influences productivity. The aim of this study was to evaluate the agronomic performance of radish cultivars in different spacing. The experiment was conducted at the Experimental Field of the Federal Institute of Education, Science and Technology of Maranhão, located in the municipality of Codó, from June to July 2017. The experimental design adopted was in randomized blocks in a 2 x 2 factorial scheme with five replications. The treatments consisted of two cultivars (Sparkler Ponta Branca and Saxa) and different spacing between plants (5 and 8 cm), totaling 20 experimental plots, where 6 useful plants were evaluated per plot. The variables evaluated were total fresh weight (MFT), fresh root weight (MFR), average root diameter (DMR), average root height (AMR) and radish root productivity (PRR). There was no significant difference for the variables MFT, MFR, AMR and DMR in the cultivars Sparkler Ponta and Saxa. The PRR showed a positive effect for the radish culture, when the spacing of 8 cm between plants was used.</p> 2020-06-20T00:00:00-05:00 ##submission.copyrightStatement## Quantification of carbon capture in different soil uses 2020-07-03T20:36:00-05:00 Jesús Geovanny Solarte Dayana Marcela Males Angela Natalia Ortiz <p>Carbon sequestration by soils in different production systems contributes greatly to the reduction of greenhouse gases. The objective of this study was to quantify the carbon stored in four land uses (fodder banks, potato, live fences and pastures) at different depths (30 and 60 cm). To this end, a design of Complete Random Blocks (CABs) was made with a bifactorial arrangement, Factor A: land uses (natural pastures, live fences, fodder banks and potato cultivation) and Factor B: two depths (30 and 60 cm), with three replications.&nbsp; To determine the percentage of carbon in the soil, complete soil samples were taken at the different depths and taken to the laboratory for analysis. As a result, marginal significant differences were found in soil uses (Pr &gt; F= 0.0573); between the depths of 30 and 60 cm significant differences were found (Pr &gt; F= 0.0061). However, no statistically significant differences were found in land use interaction by depth (Pr &gt; F= 0.0659). The fodder bank presented a higher organic carbon content (139.85 tC.ha<sup>-1</sup>) at 60 cm depth and the potato monoculture (63.32 tC.ha<sup>-1</sup>) at 30 cm depth while, at both depths, natural pasture reported lower values (54.45 and 60.02 tC.ha<sup>-1</sup>). Hence, the importance of productive systems to accumulate more carbon at greater depths of soil (60 cm) compared to lower depths (30 cm), which may be linked to management practices that are made on the top layers of the soil, generating carbon leakage.</p> 2020-06-20T00:00:00-05:00 ##submission.copyrightStatement## Physical properties of soil in the stage of establishment an agroforestry system in the high Andean zone 2020-07-03T09:55:30-05:00 Jennyfer Cristina Guerrero Jurado Anyi Valeria Andrade Martin Alonso Muñoz Iván Andrés Delgado <p>In Nariño, the change to the ground has generated some problems such as erosion, compactation, lack of fertility, and others, so it was necessary to look up alternatives to reduce these impacts. The objective of this study was to evaluate some physical properties to the ground in an agroforestal system with <em>Morella pubescens</em> (Humb. &amp; Bonpl. ex Willd.) Wilbur with <em>Smallanthus</em> <em>sonchifolius </em>(Poepp.) H.Rob in the experimental farm Botana, in the municipality of Pasto, where the parental density was analyzed, real density, total porosity, structural stability properties and distribution of aggregates, the results were obtained in two phases, f1 before the implementation to the crop and f2 according to harvest period <em>S. sonchifolious.</em> A randomized complete blocks design with three treatments ant three repetitions was used. The treatments had corresponded to harvest densities, T1: <em>S sonchifoliuos</em>, sowed to 1x1 m, T2:0,8x0,8m y T3:0,5x0,5m, with three repetitions.<em> M pusescens</em> was stablished to 4x4 m between seedlings and 9 m between lines and the control (f1). The Tukey test had significant stadistics differences between f1 (control) and f2 (treatments), to the structural stability properties and distribution of aggregates. The results showed that the ground has suffered a structural stability change to stable lightly (0,97 D.P.M) in f1 to a stable moderate (2,53 D.P.M), in f2. The distribution of aggregates passed to 60 % in f1 to 70,3 % in f2, with a media aggregation status. The different agroforestal systems management could help in long term by improving the ground´s structure through the vegetal material of arboreal component, the application of a minimums farming and the addition of organic material.</p> <p>&nbsp;</p> 2020-06-20T00:00:00-05:00 ##submission.copyrightStatement## Multiple mechanisms in which agricultural insects respond to environmental stressors: canalization, plasticity and evolution 2020-07-31T00:01:39-05:00 Yeisson Gutiérrez <p>Insects are a paramount component of biodiversity in terms of taxonomic richness, ecological functions and ecosystem services. However, many human activities have negative consequences on such organisms, causing changes in their morphology, physiology, behaviour, and even causing mass deaths leading to the well-recognized insect decline phenomenon. Although the effects of some environmental stressors (e.g. global warming, agricultural pesticides and metal pollutants) on insect biology are fairly well understood, there is a plethora of stressors that that have only recently been considered. Additionally, although the exposure to multiple stressors is a common scenario in natural conditions, our knowledge on insect responses in this regard is still incipient. Knowledge that is in much need to inform policy-makers in the fight against global change. Here, I provide a short review on prominent environmental stressors, and the known responses that insects may exhibit, which are summarized as canalization, plasticity and evolution. Furthermore, I provide an outlook and recommendation for future studies aiming to elucidate the effects of environmental stressors (both singly and in combination) on insect biology. I advocate for controlled (lab or semi-field) manipulative experiments that implement realistic environmental conditions and that ideally combine several stressors.</p> 2020-06-20T00:00:00-05:00 ##submission.copyrightStatement##