Ingeniería Agrícola y Biosistemas Volume 9, issue 1, January - June 2017 Electronic ISSN: 2007-4026
Print ISSN: 2007-3925
Versión en español

 

 

Ingeniería Agrícola y Biosistemas
Volume 9, issue 1, January - June 2017
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Hydrological modeling of a basin in Mexico’s arid northern region and its response to environmental changes Scientific article

Modelación hidrológica de una cuenca del norte árido de México y su respuesta a cambios ambientales

Gerardo Esquivel-Arriaga; María Magdalena Nevarez-Favela; Miguel Agustín Velásquez-Valle; Ignacio Sánchez-Cohen; Palmira Bueno-Hurtado

http://dx.doi.org/10.5154/r.inagbi.2016.12.008

Received: 20161205

Accepted: 2017-0314

Available online: 2017-06-28 / pages 3-17

  • A basin’s hydrological services are becoming increasingly important due to the scarcity of water in many regions of the world. The aim of this research was to evaluate the impact of variations in climate patterns on runoff from the Sextín River basin using the Water Evaluation and Planning System (WEAP) hydrological model. The hydrological scheme was developed with vector and raster cartographic information, along with land-use, vegetation, climatological and hydrometric data of the study area. Model parameterization and   calibration covered the period from 1971 to 2004. The model’s predictive performance was evaluated by NSE (Nash-Sutcliffe coefficient of efficiency), % BIAS and R2, obtaining values of 0.81, 12.1 and 0.81, respectively. Future regionalized climate change scenarios were generated with the Long Ashton Research Station Weather Generator (LARS-WG) on the basis of the Intergovernmental Panel on Climate Change (IPCC) A1B (rapid economic growth) and A2 (continuously increasing population) climate change scenarios, for the years 2020s (2010-2039) and 2050s (2040-2069). A possible mean annual increase of 1 °C, both for the maximum and minimum temperature, was observed in both analyzed periods. Increased precipitation and basin runoff were also projected in the regionalized climate scenarios. The information generated in this study can be useful for hydrological planning and management of the basin.

Mathematical modeling of greenhouse solar dryers with natural and forced convection for agricultural products: state of the art Artículos de revisión

Modelación matemática de secadores solares tipo invernadero con convección natural y forzada para productos agrícolas: estado del arte

Ángel Garduño-García; Irineo Lorenzo López-Cruz; Agustín Ruiz-García

http://dx.doi.org/10.5154/r.inagbi.2017.02.004

Received: 2017-02-13

Accepted: 2017-05-25

Available online: 2017-06-28 / pages 19-36

  • Sun-drying is the most widely used method of preserving agricultural products; however, under hostile climatic conditions it leads to serious losses in product quantity and quality. The use of solar drying technology in developing countries can reduce postharvest losses and significantly improve product quality compared to other methods. The development of mathematical models of solar dryers is necessary to be able to design, control and optimize this type of system. The aim of this study is to provide an overview of the different approaches to modeling and simulating greenhouse solar dryers, both of natural and forced convection. In addition, models that have not been extensively used in this area, such as empirical and numerical ones, are discussed.

Estimation of leaf area index and yield of greenhouse-grown poblano pepper Scientific article

Estimación de índice de área foliar y rendimiento de chile poblano cultivado en invernadero

Cándido Mendoza-Pérez; Carlos Ramírez-Ayala; Waldo Ojeda-Bustamante; Héctor Flores-Magdaleno

http://dx.doi.org/10.5154/r.inagbi.2017.04.009

Received: 2017-04-22

Accepted: 2017-06-20

Available online: 2017-06-28 / pages 37-50

  • Leaf area index (LAI) is a useful variable to characterize crop dynamics, productivity and water requirements. The three-fold aim of this work was to estimate the LAI of poplano pepper (Capsicum annuum L.) with a ceptometer, compare the results with the destructive method and analyze the relationship between the LAI and crop yield. The experiment was carried out in a greenhouse at the Colegio de Postgraduados, Montecillo campus. The transplant date was April 21 and the harvest ended on November 11, 2014. Tezontle was used as substrate and drip irrigation was applied. The experiment consisted of three treatments (T): T1 (two stems), T2 (three stems) and T3 (without pruning). To estimate the LAI, a ceptometer was used to measure the radiation intercepted above and below the canopy. Leaf area was measured with the LI-3100C area meter. Results indicated that the maximum LAI occurred at flowering, corresponding to 2,096 growing degree days (GDD) with 0.93, 1.2 and 2.75 for T1, T2 and T3. Estimating LAI with a ceptometer proved to be a suitable and reliable method, since the linear correlation coefficient (R2) obtained between the two methods was 0.82, 0.94 and 0.99, for T1, T2 and T3, respectively. The yield obtained was 10.74, 8.28 and 5.49 kg∙m-2 for T3, T2 and T1, respectively. Increasing the number of stems per plant increased LAI, yield and number of fruits; however, fruit size decreased.

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