Revista Agro Productividad
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Effects of different land uses on soil quality indicators in Lixisols from La Sabana, Huimanguillo, Tabasco, Mexico
Get PDFObjective: Evaluate the physical indicators of the quality of soils subjected to four different uses in Lixisols from La Sabana in Huimanguillo, Tabasco, Mexico.
Design/methodology/approach: Nine variables were evaluated in soil samples from Lixisols located in La Sabana, Huimanguillo: infiltration rate, resistance to penetration, bulk density, total porosity, aggregate stability, thinning, depth of the horizon, volume and weight of soil loss. We used a completely randomized sample design, with a factor with four levels (each land use: pasture, rubber tree, rubber-cocoa and rubber-mahogany tree), and five treatment repetitions, each sampling point of the plot with the five-of-golds method, with the exception of the use with pasture, which was linear.
Results: The reference soil group (RSG) corresponds to a Ferric Lixisol (Cutanic, Endoloamic, Epiarenic, Humic, Profondic), whose RSG has not been reported for the study area. The quality indicators are within acceptable limits. In soil loss, the pasture has conserved more over time, storing greater volume and weight of soil per hectare; the use with rubber (monoculture) has lost a greater amount of soil from the A horizon, evidenced by the decrease in its depth, volume and weight per hectare.
Limitations on study/implications: Until a few years ago, in the study area within La Sabana in Huimanguillo, Acrisol had been described as the dominant RSG.
Findings/conclusions: The presence of Acrisol in the study area is ruled out. Soil quality for all uses is acceptable.Objetivo: Evaluar los indicadores físicos de la calidad de suelos sometidos a cuatro usos distintos en Lixisols en la
Objective: To evaluate the physical indicators of the quality of soils subjected to four different land uses in Lixisols from La Sabana in Huimanguillo, Tabasco, Mexico.
Design/methodology/approach: Nine variables were evaluated in soil samples from Lixisols located in La Sabana, Huimanguillo: infiltration rate, resistance to penetration, bulk density, total porosity, aggregate stability, thinning, depth of the horizon, volume and weight of soil loss. We used a completely randomized sample design, with a factor with four levels (each land use: pasture, rubber tree, rubber-cacao and rubber-mahogany), and five treatment repetitions; each sampling point of the plot with the five-of-golds method, with the exception of the use with pasture, which was linear.
Results: The reference soil group (RSG) corresponds to a Ferric Lixisol (Cutanic, Endoloamic, Epiarenic, Humic, Profondic), whose RSG has not been reported for the study area. The quality indicators are within acceptable limits. In soil loss, the pasture has conserved more over time, storing greater volume and weight of soil per hectare; the use with rubber (monoculture) has lost a greater amount of soil from the A horizon, evidenced by the decrease in its depth, volume and weight per hectare.
Limitations on study/implications: Until a few years ago, in the study area within La Sabana in Huimanguillo, Acrisol had been described as the dominant RSG.
Findings/conclusions: The presence of Acrisol in the study area is ruled out. Soil quality for all uses is acceptable
Plant growth and early in vitro floral differentiation of vanilla (Vanilla planifolia Jacks. ex Andrews)
Get PDFObjective: To induce in vitro flowering of vanilla (Vanilla planifolia) with different plant growth regulators (PGRs) using the double-layer technique.
Design/methodology/approach: A layer of semi-solid Knudson C (KC) medium, added with 40 g L-1 sucrose, 15% coconut water (CW; v/v) and 7 g L-1 agar, was placed in 100 mL flasks. A liquid layer of the same composition without agar was placed on top. It was supplemented with different doses (mg L-1) of PGRs: 6-benzyladenine (BA) (7), thidiazuron (TDZ) (6), paclobutrazol (PBZ) (0.5) and gibberellic acid (AG3) (2). Plus two controls, C1: no PGRs + no CW; C2: no PGRs + CW. Vanilla shoots of 2 cm in length and with at least one axillary shoot were placed. They were incubated at a temperature of 26±2 °C day and 18 °C darkness, with light intensity of 55 µmol m-2 s-1 during 13 weeks. The number of shoots, leaves and roots was evaluated, as well as the length of shoots and fresh weight. Floral differentiation was evaluated at the tenth week by conventional microtechnique.
Results: The number shoots and leaves and shoot length were significantly higher in C2. The number of roots increased with PBZ 0.5 mgL-1. C1 and C2 promoted higher fresh weight. Floral differentiation was observed with AG3 2 and PBZ 0.5 mg L-1 treatments.
Limitations on study/implications: Further evaluation of other PGR doses and environmental conditions is required to achieve full floral differentiation of vanilla.
Findings/conclusions: CW increased vegetative growth. AG3 and PBZ showed early floral differentiation in Vanilla planifolia, which is the first report of this phenomenon for the species.
Water quality in an aquaponics system interconnected with a biofilter
Get PDFObjective: To determine the water quality of an aquaponic system interconnected by a biofilter, using loofah (Luffa cylindrica) as an inert support.
Design/methodology/approach: The organisms used in the aquaponic system were juvenile tilapia (Oreochromis niloticus) and epazote (Chenopodium ambrosioides). The physical-chemical parameters analyzed in the water were: temperature, pH, dissolved oxygen, electrical conductivity, NH4+, NO2- and NO3-. The data generated in this work were subjected to analysis of variance (ANOVA) and comparison of means (Tukey p<0.05).
Results: Recirculation of pond water through the biofilter and plants reduced NH4+ and NO3- by 31.6% and 18.5%, respectively. In the pond, the total ammoniacal nitrogen did not exceed 0.022 mg L-1. The survival of the fish was 100% and 725.8 g of epazotes were harvested, which did not show symptoms of mineral deficiency.
Limitations on study/implications: Aquaponic production is still limited to small areas due to the costs involved in its management.
Findings/conclusions: The water quality parameters of the tilapia (Oreochromis niloticus)-epazote (Chenopodium ambrosioides) aquaponic system, interconnected through a biofilter with Luffa cylindrica were maintained within the recommendations for said system.
Keywords: Biofilter, aquaculture, mineralization, ammoniaObjective: To determine the water quality of an aquaponics system interconnected by a biofilter, using sponge gourd (Luffa cylindrica) as an inert support.
Design/Methodology/Approach: The organisms used in the aquaponics system were juvenile tilapia (Oreochromis niloticus) and wormseed (Chenopodium ambrosioides). The following physicochemical parameters of the water were analyzed: temperature, pH, dissolved oxygen, electrical conductivity, NH4+, NO2-, and NO3-. Data generated in this work were subjected to an analysis of variance (ANOVA) and to the comparison of means (Tukey’s test, p<0.05).
Results: Recirculating tank water through the biofilter and plants reduced NH4+ and NO3- by 31.6% and 18.5%, respectively. The total ammonia nitrogen in the tank did not exceed 0.022 mg L-1. The fish survival rate was 100% and 725.8 g of wormseed were harvested. The wormseed did not show symptoms of mineral deficiency.
Study Limitations/Implications: Aquaponics production is still limited to small surfaces, as a consequence of the costs involved in its handling.
Findings/Conclusions: Water quality parameters of the tilapia (Oreochromis niloticus)-wormseed (Chenopodium ambrosioides) aquaponics system —interconnected through a biofilter with Luffa cylindrica— fulfilled the recommendations for such system
Morphological characterization of Elephant grass (Pennisetum purpureum Schumach) ecotypes collected in Chiapas, Mexico
Get PDFObjective: To characterize the morphology of 18 ecotypes of Elephant grass (Pennisetum purpureum Schumach) in Chiapas. Design/Methodology/Approach: The morphological characterization was carried out with 34 quantitative and qualitative descriptors. A principal component analysis and a hierarchical cluster analysis were performed based on the average data. Results: In the principal component analysis, five of the principal components accounted for 70.7% of the total variability in the 18 ecotypes of Elephant grass. The variables that made the most significant contributions in each CP were: in CP1, internode diameter (p<0.01), internode length (p<0.05), color of internode without wax (p<0.01), number of innovations (p<0.01 ), prophylls (p<0.01), number of prophylls (p<0.01), external length of the sheath (p<0.01), internal length of the sheath at its opening point (p<0.01), opening of the auricle (p<0.01 ); for CP2, the number of visible internodes (p<0.05), channel width (p<0.05), size of innovations (p<0.05), adventitious root, number of internodes (p<0.01), wax under the sheath (p<0.05); and for CP3, number of visible internodes (p<0.05), color of the internode with wax (p<0.001), channel depth (p<0.001), ligule shape (p<0.05) and leaflet tip (p< 0.05). As a result of the hierarchical cluster analysis and the semipartial correlation coefficient, five morphologically distinct groups were determined.
Study Limitations: A more accurate description of the morphological diversity of the grasses requires the characterization of the inflorescence and the spikelet.
Findings/Conclusions: The 18 ecotypes of the Elephant grass (Pennisetum purpureum Schumach) collected and characterized were dissimilar with each other; consequently, they are considered a genetic resource with potential importance as forage on the Chiapas coast
Yield evaluation of rocoto pepper (Capsicum pubescens R and P) with application of calcium carbonate in greenhouses
Get PDFThe manzano chili is native to South America. It is characterized by having a fleshy pulp and is very popular in Latin American cuisine. In the state of Chihuahua, Mexico, Chili peppers of the jalapeño, serrano, chilaca and cayenne varieties are grown, while the manzano chili can be an option for greenhouse cultivation. The objective of the present work was to evaluate if the applications of calcium carbonate to the soil and to the plant (foliar route) influence the weight and number of fruits in manzano peppers under greenhouse conditions. The study was carried out in the greenhouse of the Faculty of Agrotechnological Sciences, of the Autonomous University of Chihuahua. For the generation of the treatments, the Taguchi method was used, creating 13 treatments, for 2 factors and 5 levels each factor, with 5 repetitions per treatment, using 65 plants in the study. Data analysis was performed using the quadratic response surface technique, adjusting the surface to determine the factor levels for optimal response. In order to obtain the highest weight in the three harvests 234.8 g, it is necessary to reduce the CaCO3 to the soil by 9%, while increasing the CaCO3 to the foliar by 100%. To increase the number of peppers from 59 to 70 in the three harvest periods, it is necessary to increase CaCO3 in the soil and foliar by 8.5% and 100%.Objective: To evaluate if the application of calcium carbonate on the soil and to the leaf influences the weight and number of fruits in rocoto pepper grown under greenhouse conditions.
Design/Methodology/Approach: The study was carried out in the greenhouse of the Facultad de Ciencias Agrotecnológicas, of the Universidad Autónoma de Chihuahua. The Taguchi method was used to develop the 13 treatments, with two factors, five levels per factor, and five repetitions per treatment, using 65 plants under study. Data was analyzed using the quadratic response surface technique, fitting the surface to determine factor levels for optimal response.
Results: Reducing soil CaCO3 by 9% and increasing leaf CaCO3 by 100% was necessary to obtain the highest weight in the three harvests (234.8 g).
Findings/Conclusions: A rise in the number of rocoto peppers (from 59 to 70, in the three harvest periods) required an increase in the soil and foliar CaCO3 by 8.5% and 100%, respectively
Agriculture 4.0: Is Mexico Ready?
Get PDFObjective: To analyze the possibilities and actions required to foster the introduction of technologies consistent with the term “agriculture 4.0” in Mexico.Design/Methodology/Approach: To identify providers of technology in Mexico. To present the cost-benefit equation regarding the adoption of said technology as applied to the cultivation of maize in different regions. Todesign and construct an adoption propensity index that will serve as a basis to propose focused and adequate actions to remove technology access barriers.Results: Mexico has a young and wide offer of technology, both tangible and intangible, where digital platforms of agricultural management, mobile apps, and remote monitoring predominate. The cost-benefit relationshipoffers a large margin to adopt new technologies. However, there are adoption barriers (related to education or infrastructure, for instance) that represent a challenge to different regions of the country: the northern,northeastern, and western states of Mexico are more likely to adopt new technologies.Study limitations/Implications: Further experimental and field analysesare required to delve deeper into potential additional barriers (culture-related, for example).
Agro productividad 2022. https://doi.org/10.32854/xxxxxx (Los autores no deben realizar ningún cambio en este apartado) 2 of 8
Findings/Conclusions: The cost-benefit analysis offers a large margin foradoption. However, the propensity to adopt is associated to restrictingfactors such as the producers’ educational level, the production unit’s sizeand level of mechanization, the access to and use of Information andCommunication Technologies, and the telecoms infrastructure, whosegeographic disparity is significant. The public sector’s intervention isdesirable to reduce the gap between the supply and demand oftechnologies, as well as the access barriers to the latter
Strawberry (Fragaria x ananassa Duch.) production in a vertical hydroponic greenhouse system
Get PDFObjective: A vertical hydroponic greenhouse system (VHGS) was designed and built to evaluat two strawberry varieties (Festival and San Andreas), in two planting densities per pot (40 and 54 plants/m 2 ) and three elevation levels (high, medium, and low).
Design/Methodology/Approach: At 126 days after transplanting (dat), the Festival variety showed significant differences in the number of leaves and in the crown diameter.
Results: The vertical hydroponic greenhouse system had a high fruit yield (21 kg m2 ): i.e., this productionsystem is up to 35 % more efficient than the open field cultivation system or the multi-tunnel greenhouse system. There was a positive correlation between the number (r 2 =0.89), diameter (r 2 =0.54), and weight (r 2 =0.40) of the fruits and the total yield. Planting density did not show a significant effect on plant growth, yield, and fruit quality. The vertical pot system did not show differences between elevation levels. This production system is a viable option for populations in places with a scarcity of water and to obtain fruits with guaranteed food safety
Effect of plant extracts on the inhibition of the mycelial growth of Penicilium citrinum Link
Get PDFObjective: Evaluate in vitro plant extracts of three plant species: mistletoe (Psittacanthus spp.), skunk grass (Petiveria alliacea) and ginger (Zingiber officinale), to determine the inhibitory effect on mycelial growth of Penicilliun citrinum isolated from coffee beans.
Design/methodology/approach: Filtrations were performed under aseptic conditions using a vacuum system. These were added to the Potato Dextrose Agar medium, once solidified a 5 mm disc of P. citrinum was placed in the center of the Petri dish.
Results: The ethyl plant extracts showed inhibition of (100%) on the development of the pathogen as well as the chemical product.
Findings/conclusions: Ethyl plant extracts can be an agroecological alternative to control P. citrinum.Objective: To evaluate in vitro plant extracts of three plant species —mistletoe (Psittacanthus spp.), guinea hen weed (Petiveria alliacea), and ginger (Zingiber officinale)— with the aim of determining their inhibitory effect on the mycelial growth of Penicilliun citrinum isolated from coffee beans.Design/Methodology/Approach: Filtrations were carried out under aseptic conditions using a vacuum system and were added to the Potato Dextrose Agar medium. Once it had solidified, a 5-mm disc of P. citrinum was placed in the center of the Petri dish.Results: The ethyl plant extracts, like the chemical product, showed a 100% inhibition on the pathogen development.Findings/Conclusions: Ethyl plant extracts can be an agroecological alternative for the control of P. citrinum
Is there a “made in Mexico” model for innovation transfer or diffusion among farmers?
Get PDFObjective: To determine the existence or absence of a model or several models for the transfer of innovations that have been developed and evaluated in Mexico.
Design/methodology/approach: Using the SCOPUS® metadatabase, a search was conducted with the words innovation AND farmer AND Mexico. It resulted in 70 articles, of which only 35 met the selection criteria.
Results: The articles used concepts, frames of reference, and, to a lesser degree, theories to support their research. The highest number of published cases dealt with the MasAgro technological hub model in maize and the GGAVATT model for group-oriented work in livestock.
Limitations on study/implications: Using a metadata base that is not open access limits the results, since technical reports, books, and other documents that might otherwise enrich the discussion are left aside.
Findings/conclusions: There is still much to be theorized in order to create new models adapted to other product systems that could promote technology transfer from the institutions of the sector and researchers to farmers
BIOSTIMULATION OF CUCUMBER CROP PRODUCED IN SHELTERED CONDITIONS
Get PDFObjective: To evaluate the physiological and productive response of cucumber crop to the induction of three commercial phytohormones (Cito Xplosión, Súper Hormonal, Vitaminum Forte) grown under protected conditions. Design/methodology/approach: The experiment consisted of three treatments, T1 (Cito Xplosión), T2 (Súper Hormonal), and T3 (Vitaminum Forte). The evaluated variables were plant height, number of leaves, fresh biomass, fruit diameter and length, number and weight, total soluble solids, pH, and electrical conductivity. Results: In the physiological variables, values of plant heights were 225, 228, 220, and 238 cm for T1, T2, T3, and the control. 33 leaves for all treatments and 31 for the control, T1 and T2 produced higher fresh biomass in leaves, stems, roots, and flowers, while T3 produced higher biomass in fruits. For the fruit length, the values were 16.9, 17.6, 17.6, and 18.4 cm, and diameters of 5.2, 5.2, 5.1, and 5.1 cm for T1, T2, T3, and the control. The weight of fruits was 293.2, 297.3, 283.9, and 281.7 g with yields of 10.1, 10.9, 10.0, and 9.6 kg m-2 for T1, T2, T3, and the control.
Limitations on study/implications: More varieties should be evaluated using different nutrient solution concentrations and management practices as a function of the number of stems to assess whether phytohormones influence physiological or productive variables. Findings/conclusions: From an economic point of view, T2 was the best treatment, achieving a higher yield and fruit quality