Optimizing nitrogen fertilizer and planting density levels for maize production under current climate conditions in Northwest Ethiopian midlands

Kindie Tesfaye Dereje Ademe Enyew Adgo (2023, [Artículo])

This study determined the most effective plating density (PD) and nitrogen (N) fertilizer rate for well-adapted BH540 medium-maturing maize cultivars for current climate condition in north west Ethiopia midlands. The Decision Support System for Agrotechnology Transfer (DSSAT)-Crop Environment Resource Synthesis (CERES)-Maize model has been utilized to determine the appropriate PD and N-fertilizer rate. An experimental study of PD (55,555, 62500, and 76,900 plants ha−1) and N (138, 207, and 276 kg N ha−1) levels was conducted for 3 years at 4 distinct sites. The DSSAT-CERES-Maize model was calibrated using climate data from 1987 to 2018, physicochemical soil profiling data (wilting point, field capacity, saturation, saturated hydraulic conductivity, root growth factor, bulk density, soil texture, organic carbon, total nitrogen; and soil pH), and agronomic management data from the experiment. After calibration, the DSSAT-CERES-Maize model was able to simulate the phenology and growth parameters of maize in the evaluation data set. The results from analysis of variance revealed that the maximum observed and simulated grain yield, biomass, and leaf area index were recorded from 276 kg N ha−1 and 76,900 plants ha−1 for the BH540 maize variety under the current climate condition. The application of 76,900 plants ha−1 combined with 276 kg N ha−1 significantly increased observed and simulated yield by 25% and 15%, respectively, compared with recommendation. Finally, future research on different N and PD levels in various agroecological zones with different varieties of mature maize types could be conducted for the current and future climate periods.

Maize Model Planting Density CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA MAIZE MODELS SPACING NITROGEN FERTILIZERS YIELDS

Modelos Hargreaves Priestley-Taylor y redes neuronales artificiales en la estimación de la evapotranspiración de referencia

Reference evapotranspiration estimation by Hargreaves Priestley-Taylor and artificial neural networks models

ROCIO CERVANTES OSORNIO RAMON ARTEAGA RAMIREZ MARIO ALBERTO VAZQUEZ PEÑA WALDO OJEDA BUSTAMANTE ABEL QUEVEDO NOLASCO (2012, [Artículo])

Resulta costoso medir directamente la evapotranspiración de referencia (ET0) con un lisímetro, y al no contar con esta información se utilizó el método de Penman-Monteith modificado por la FAO (ET0 FAO-56 P-M) para su cálculo. El objetivo del presente trabajo fue realizar una comparación de modelos empíricos como el de Hargreaves, Hargreaves calibrado y Priestley-Taylor, con el modelo de redes neuronales artificiales función de base radial (RNA BR), con las mismas variables de entrada, en la estimación de la ET0 FAO-56 P-M. Las estimaciones de ET0 se evaluaron en cuatro estaciones climáticas del Distrito 075, Valle del Fuerte en Sinaloa, México.

Cultivos alimenticios Planificación del riego Evapotranspiración Modelos matemáticos INGENIERÍA Y TECNOLOGÍA

Novel SSR markers from BAC-end sequences, DArT arrays and a comprehensive genetic map with 1,291 marker loci for chickpea (Cicer arietinum L.)

MAHENDAR THUDI Abhishek Bohra Spurthi Nayak Trushar Shah R. Varma Penmetsa Nepolean Thirunavukkarasu Pooran Gaur Pawan Kulwal Hari Upadhyaya Polavarapu Kavi Kishor Rajeev Varshney (2011, [Artículo])

Molecular Markers Recombinant Inbred Lines CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA GENETIC MARKERS MICROSATELLITES PLANTS DNA CHICKPEAS ARRAYS TECHNOLOGY CHROMOSOME MAPPING GENETIC VARIATION GENOTYPES MOLECULAR CLONING

An international reference consensus genetic map with 897 marker loci based on 11 mapping populations for tetraploid groundnut (arachis hypogaea l.)

Manish Pandey Trushar Shah David Bertioli Rajeev Varshney (2012, [Artículo])

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA BACKCROSSING GENOTYPES GROUNDNUTS MICROSATELLITES ARACHIS HYPOGAEA CHROMOSOME MAPPING PLANTS GENETIC MARKERS QUANTITATIVE TRAIT LOCI TETRAPLOIDY

Copper oxide nanoparticles biosynthetized Copper oxide nanoparticles biosynthetized biosynthetizedimprove germination improve germination improve germination and bioactive compounds in wheat sprouts

Hortensia Ortega OrtÍz JAZMIN MONTSERRAT GAUCIN DELGADO Pablo Preciado Rangel Manuel Fortis Hernández Luis Guillermo Hernández Montiel Efraín de la Cruz Lázaro Liliana Lara Capistrán (2022, [Artículo])

"Metal nanoparticles have many positive effects in improving crop production and productivity and allow for increased germination and rapid crop establishment under field conditions. The metallic nanoparticles applied in this study were copper oxide nanoparticles (CuONPs) biosynthesized using orange peel (Citrus X sinensis) as a reducing agent to avoid or reduce toxicity in wheat seeds and sprouts. This study determined the effect of CuONPs on germination, radicle and plumule length, as well as the production of phytochemical compounds in wheat sprouts. The seeds were treated with suspensions of CuONPs at the following concentrations: 0, 0.5, 1, 2, 4 and 6 mg mL-1. The results indicate that the use of low doses of CuONPs (0.5 mg mL-1), improved germination, vigor, plumule and radicle length, in addition to increasing the biosynthesis of phytochemical compounds in wheat shoots. A high concentration of CuONPs (6 mg mL-1) causes inhibitory effects due to Cu accumulation and phytotoxicity in plant tissue. The use of CuONPs for green synthesis is a viable alternative to obtain beneficial effects in germination and seedling development, as well as greater secondary metabolite production."

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CIENCIAS AGRARIAS AGROQUÍMICA REGULADORES DEL CRECIMIENTO DE LAS PLANTAS REGULADORES DEL CRECIMIENTO DE LAS PLANTAS

Monitoring the threat of unintentional transgene flow into maize gene banks and breeding materials

Monica Mezzalama Rodomiro Ortiz (2010, [Artículo])

Genetic Integrity Germplasm Enhancement Genetically Modified Maize CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA BREEDING GERMPLASM MAIZE RECOMBINANT DNA TRANSGENES GENETIC ENGINEERING PLANTS BIOSAFETY

CuO-NPs Improve Biosynthesis of Bioactive Compounds in Lettuce

JAZMIN MONTSERRAT GAUCIN DELGADO Luis Guillermo Hernández Montiel Manuel Fortis Hernández JUAN JOSE REYES PEREZ José Antonio González Fuentes Pablo Preciado Rangel (2022, [Artículo])

"The application of metallic nanoparticles improves the yield and content of bioactive compounds in plants. The aim of the present study was to determine the effects of the foliar application of copper nanoparticles (CuO-NPs) in the yield and content of bioactive compounds in lettuce. Different concentrations of CuO-NPs (0, 0.5, 1, 2, 4, and 6 mg mL−1 ) were applied in lettuce. The yield, nutraceutical quality, and enzymatic activity were determined. Foliar spraying of CuO-NPs induced an increase in the biosynthesis of bioactive compounds. In addition to an increase in the activity of the enzymes superoxide dismutase (SOD) and catalase (CAT) in lettuce plants, there were no negative effects on yield. Therefore, with the application of CuO-NPs, better quality lettuces are produced for the human diet due to the higher production of bioactive compounds."

nano-biofortification, nanoparticles, antioxidants, Lactuca sativa L. CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CIENCIAS AGRARIAS AGROQUÍMICA REGULADORES DEL CRECIMIENTO DE LAS PLANTAS REGULADORES DEL CRECIMIENTO DE LAS PLANTAS

El impacto de los mantenimientos preventivos en los sistemas fotovoltaicos interconectados a la red de distribución eléctrica

Kassandra Elizabeth López Esparza Raúl Pérez Bustamante GUILLERMO RAUL GARCIA FERRERA (2023, [Artículo])

La obligación de llevar un sistema o equipo a su máximo rendimiento y operación, así como la resolución de posibles fallas en el mismo, ha dado lugar a la necesidad de desarrollar un ámbito especializado dedicado exclusivamente a abordar estas obligaciones. De esto surge el campo del mantenimiento, cuyo propósito fundamental es asegurar el funcionamiento adecuado de los equipos o instalaciones en los cuales se lleva a cabo dicho trabajo, así como corregir y prevenir fallas o problemas en los sistemas en cuestión. El mantenimiento puede aplicarse en una amplia gama de sectores donde se necesite prevenir o corregir alguna operación, y en el caso del sector energético renovable esto no es una excepción. En particular, el mantenimiento de los sistemas fotovoltaicos interconectadas a la red (SFIR) busca llevar la instalación a su mejor zona de operación y funcionamiento para con esto asegurar la generación de energía. Es por esta razón, que el sector energético se ha unido al desarrollo de una rama que se dedique a la operación y mantenimiento (O&M) de los sistemas fotovoltaicos. En este artículo se exponen los resultados de un estudio de mantenimiento preventivo en una instalación fotovoltaica ubicada en el estado de Aguascalientes, el cual fue realizado por Sunna Power, una empresa dedicada a ofrecer servicios de mantenimiento a SFIR en México. El trabajo explorará el estado de la instalación previo al mantenimiento y su situación una vez que éste ha sido ejecutado. Aun cuando los SFIR requieren poco mantenimiento, este articulo pretende demostrar que a pesar de esto la implementación de un plan de mantenimiento en las instalaciones puede generar un impacto positivo en la producción de energía del sistema, mostrando los resultados obtenidos en el mantenimiento ejecutado en la instalación fotovoltaica.

The obligation to ensure that a system or piece of equipment achieves its maximum performance and functionality, and to correct any failures that may occur, has led to the need to develop a specialized field dedicated exclusively to meeting these obligations. This has given rise to the field of maintenance, the basic aim of which is to ensure the correct functioning of the equipment or installations on which the work is carried out, and to correct and prevent any failures or problems in the systems concerned; maintenance can be applied in a wide range of sectors where it is necessary to prevent or correct an operation, and the renewable energy sector is no exception. In particular, the maintenance of photovoltaic systems connected to the grid (SFIR) aims to bring the installation to its best operational and functional range in order to guarantee energy production; it is for this reason that the energy sector has participated in the development of a branch dedicated to the operation and maintenance (O&M) of photovoltaic systems. This article presents the results of a preventive maintenance study in a photovoltaic plant located in the state of Aguascalientes, carried out by Sunna Power, a company dedicated to providing maintenance services to SFIR in Mexico. The study examines the condition of the installation before maintenance and the situation after maintenance. Although SFIR requires little maintenance, this article aims to demonstrate that the implementation of a maintenance plan in the plants can nevertheless have a positive impact on the energy production of the system, displaying the results obtained in the maintenance carried out on the photovoltaic installation.

Mantenimiento preventivo Módulo fotovoltaico Plan de mantenimiento Sistema fotovoltaico Preventive maintenance Maintenance plan Photovoltaic system INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS OTRAS ESPECIALIDADES TECNOLÓGICAS OTRAS OTRAS

Plant Growth-Promoting Rhizobacteria Improve Growth and Fruit Quality of Cucumber under Greenhouse Conditions

GERARDO ZAPATA SIFUENTES Luis Guillermo Hernández Montiel Jorge Sáenz Mata Manuel Fortis Hernández EDUARDO BLANCO CONTRERAS ROBERTO GREGORIO CHIQUITO CONTRERAS Pablo Preciado Rangel (2022, [Artículo])

"Cucumber fruit is rich in fiber, carbohydrates, protein, magnesium, iron, vitamin B, vitamin C, flavonoids, phenolic compounds, and antioxidants. Agrochemical-based production of cucumber has tripled yields; however, excessive synthetic fertilization has caused problems in the accumulation of salts in the soil and has increased production costs. The objective of this study was to evaluate the effect of three strains of plant growth-promoting rhizobacteria (PGPR) on cucumber fruit growth and quality under greenhouse conditions. The rhizobacteria Pseudomonas paralactis (KBendo6p7), Sinorhizobium meliloti (KBecto9p6), and Acinetobacter radioresistens (KBendo3p1) was adjusted to 1 × 108 CFU mL−1 . The results indicated that the inoculation with PGPR improved plant height, stem diameter, root length, secondary roots, biomass, fruit size, fruit diameter, and yield, as well as nutraceutical quality and antioxidant capacity, significantly increasing the response of plants inoculated with A. radioresistens and S. meliloti in comparison to the control. In sum, our findings showed the potential functions of the use of beneficial bacteria such as PGPR for crop production to reduce costs, decrease pollution, and achieve world food safety and security."

rhizobacteria, PGPR, nutraceutical quality CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CIENCIAS AGRARIAS AGROQUÍMICA REGULADORES DEL CRECIMIENTO DE LAS PLANTAS REGULADORES DEL CRECIMIENTO DE LAS PLANTAS

Effect of Pectimorf on the rooting ability, and morpho-physiological physiological trials of national cocoa (Theobroma cacaoL.) under different substrates

JUAN JOSE REYES PEREZ Luis Tarquino Llerena Ramos Víctor Hugo Reynel Chila Juan Antonio Torres Rodríguez FAROUK SAAD Luis Guillermo Hernández Montiel Wilmer Tezara (2022, [Artículo])

"Cocoa is an economical cash crop that is formerly planted worldwide. Cuttings are a method of vegetative propagation suitable for maintaining desirable characteristics in cocoa trees. A greenhouse experiment was performed to evaluate the optimal concentrations of Pectimorf® (0, 10, 50, and 100 mg L-1) for rooting ability and seedling establishment as well as some physiological trials of 4 months EETP-800 national cocoa cuttings grown under two different substrates (S1: 80% soil + 20% sand and S2: 70% soil + 20% sand + 10% rice husk). The data showed that in most cases there are no significant differences in vegetative growth and root characteristics as well as gas exchange parameters between the two substrates. On the other hand, the application of Pectimorf® concentration enhanced all tested traits compared to untreated plants. The most effective in this regard was 100 mg L-1, that giving the highest value of all trials. As for the interaction effect, the result also shows that the application of Pectimorf® concentration in special at 100 mg L-1 among two substrates had an additive effect on plant growth, gas exchange, and survival percentage compared to non-treated cuttings. The application of 100 mg L-1 Pectimorf® with S2 substrate produced stronger seedlings with a higher survival percentage. This protocol can be used commercially for cocoa propagation commercially."

bioregulator, cuttings, root length, photosynthesis CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CIENCIAS AGRARIAS AGROQUÍMICA REGULADORES DEL CRECIMIENTO DE LAS PLANTAS REGULADORES DEL CRECIMIENTO DE LAS PLANTAS