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1
artículo
Publicado 2017
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The objective of this work was to evaluate the physiological quality and oil and protein content of soybean seeds harvested in different stages of plant development and different periods of harvest delay. The cultivar studied was BRS Valiosa RR and the experimental design was of randomized blocks with three replications. Eleven treatments were established, constituting different times of harvest in the following stages: R5,1, R5,3, R5,5, R6, R7,1, R7,3, R8,1, R9, R9+10days, R9+20 days and R9+30 days. The anticipation of the harvest was made possible through the application in predetermined stages, of herbicide Diquat (400 g ha-1) with manual coastal spray with nozzle "type fan" set to volume of 300 L ha-1. After the harvest it was done the evaluation of physiological quality of seeds and the determination of the levels of oil and protein. It was noted that the stadium R7.1 was the harves...
2
artículo
Publicado 2017
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The objective of this work was to evaluate the physiological quality and oil and protein content of soybean seeds harvested in different stages of plant development and different periods of harvest delay. The cultivar studied was BRS Valiosa RR and the experimental design was of randomized blocks with three replications. Eleven treatments were established, constituting different times of harvest in the following stages: R5,1, R5,3, R5,5, R6, R7,1, R7,3, R8,1, R9, R9+10days, R9+20 days and R9+30 days. The anticipation of the harvest was made possible through the application in predetermined stages, of herbicide Diquat (400 g ha-1) with manual coastal spray with nozzle "type fan" set to volume of 300 L ha-1. After the harvest it was done the evaluation of physiological quality of seeds and the determination of the levels of oil and protein. It was noted that the stadium R7.1 was the harves...
3
artículo
Publicado 2023
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Se realizó la investigación sobre el crecimiento experimental de Oreochromis aureus a diferentes fotoperiodo en sistema cerrado en Trujillo, Perú en el Laboratorio de Acuicultura de la Universidad Nacional de Trujillo. Se adquirió semilla del Módulo La Balsa y se evaluó el crecimiento experimental de O. aureus con tres tratamientos de fotoperiodo T1-24:0, T2-12:12 y T3- fotoperiodo natural en sistema cerrado indoor. El crecimiento en longitud y peso promedio de la tilapia fue de 106,28 mm y 23,18 g en T1, en T2 102,69 mm y 21,55 g y T3 102,69 mm y 21,55 g en 128 días de crianza. Se concluye que el crecimiento de O. aureus fue ligeramente mayor en el fotoperiodo del T1- 24:0 sin presentar diferencias significativas en los tratamientos.
4
artículo
Publicado 2018
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The purpose of the study was to characterize the production of rainbow trout (Oncorhynchus mykiss) in the province of Chincheros, Apurímac. Interviews were done to 85% of the producers (n=21) through a survey between November and December 2017. In general, 85.7% of the respondents were over 40 years old, where 42.9% had complete secondary education. The two main activities developed by the producers were agriculture (38.0%) and trout farming (33.3%). More than 50% produced more than three tons of trout per year. The pools were constructed with soil and cement (38.0%), the water supply was mainly from springs (85.7%). About half of the respondents had potable water and electricity services in their productive centres. Most purchase fingerlings as seed (85.7%), which are mostly bred for 7 and 8 months. Most episodes of mortality occur in the summer season (85%) and are attributed to chang...
5
tesis de grado
Universidad Nacional Agraria La Molina. Facultad de Agronomía. Departamento Académico de Fitotecnia
6
artículo
The oyster Crassostrea gigas (Thunberg 1795) culture in an artisanal breeding pond, La Arena, Casma.
Publicado 1999
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This paper describes the methodology used for the culture of Pacific oyster Crassostrea gigas in an artisanal breeding pond in the La Arena acuicola center, in Casma. Reproducers at gonadal maturity phase from the culture lines of the center were used. They were prepared in fiber glass tanksi of 1000 L capacity with unfiltered sea water at 27 ± 0,9 oC, and fed with maize fecula and microalgae collected from site. In one group spawning was induced by thermal stimulation (30 to 31 oC), in the other one hydrogen peroxide was added, obtaining different responses. 20 minutes after fertilization the polar body was defined in 100% of fertilized eggs; veliger larvae were visible 24 hours after fertilization. Larvae reached the pediveliger stage 20 days after culture, with average sizes of 237 ± 10 µm. Ground shells (300pm), sandpapered black plastic and oyster valvas were used for settlement ...
7
artículo
The oyster Crassostrea gigas (Thunberg 1795) culture in an artisanal breeding pond, La Arena, Casma.
Publicado 1999
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This paper describes the methodology used for the culture of Pacific oyster Crassostrea gigas in an artisanal breeding pond in the La Arena acuicola center, in Casma. Reproducers at gonadal maturity phase from the culture lines of the center were used. They were prepared in fiber glass tanksi of 1000 L capacity with unfiltered sea water at 27 ± 0,9 oC, and fed with maize fecula and microalgae collected from site. In one group spawning was induced by thermal stimulation (30 to 31 oC), in the other one hydrogen peroxide was added, obtaining different responses. 20 minutes after fertilization the polar body was defined in 100% of fertilized eggs; veliger larvae were visible 24 hours after fertilization. Larvae reached the pediveliger stage 20 days after culture, with average sizes of 237 ± 10 µm. Ground shells (300pm), sandpapered black plastic and oyster valvas were used for settlement ...
8
artículo
Publicado 2025
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Introduction: Myrciaria dubia “camu-camu” is an economically important Amazonian fruit shrub known for its exceptionally high vitamin C content. Despite its commercial value, comprehensive phenotypic characterization of available genetic resources remains limited, hindering breeding programs and conservation strategies. This study aimed to characterize the phenotypic diversity of wild accessions maintained in a 36-year-old ex situ germplasm bank, one of the most comprehensive M. dubia collections globally, to provide baseline data for genetic improvement and conservation. Methods: We evaluated 43 wild accessions systematically collected from eight major hydrographic basins in the Loreto region using a stratified sampling approach to capture maximum ecological diversity and maintained in an ex situ germplasm bank established in 1988 at the National Institute of Agrarian Innovation in ...
9
artículo
Publicado 2021
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Six divergent genotypes of sesame (Sesamum indicum L.) were crossed using a half diallel excluding reciprocal crosses, to estimate heterosis, combining ability and nature of gene action for studied traits under two irrigation regimes. The two irrigation regimes were normal irrigation conditions with amount of applied water 5952.38 m3/ha and water stress conditions with amount of applied water 2976.19 m3/ha at Etay-El-Baroud Agricultural Research Station, Behaira governorate, Agricultural Research Center, Egypt during 2019 summer season. A randomized complete block design with three replications was used for each irrigation regimes. The variation of genotypes and their components from parents, crosses and parents versus crosses were highly significant for all studied traits under both irrigation regimes and their interactions with irrigation. Variation attributable to general and specific...
10
artículo
Publicado 2016
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The study was performed in order to identify the feasibility of operating a demonstration module production seed Nile tilapia in La Libertad. They told rearing tanks with aeration system and water recirculation supplemented with probiotic administration. Brood fish were acquired in Moyobamba, San Martin and after receipt underwent a selection process based on morphological characteristics that offer advantage for meat production. In breeding adults was established relationship female male 3: 1. They were examined periodically females to collect eggs or larvae in their mouth for handling in artisanal incubators. They were evaluated the physical and chemical variables units incubation and breeding for the purpose of monitoring and control of water quality observing demonstration module temperature levels of 16.6 and 29 °C without the survival of being affected species. The highest frequen...
11
artículo
Publicado 2016
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The study was performed in order to identify the feasibility of operating a demonstration module production seed Nile tilapia in La Libertad. They told rearing tanks with aeration system and water recirculation supplemented with probiotic administration. Brood fish were acquired in Moyobamba, San Martin and after receipt underwent a selection process based on morphological characteristics that offer advantage for meat production. In breeding adults was established relationship female male 3: 1. They were examined periodically females to collect eggs or larvae in their mouth for handling in artisanal incubators. They were evaluated the physical and chemical variables units incubation and breeding for the purpose of monitoring and control of water quality observing demonstration module temperature levels of 16.6 and 29 °C without the survival of being affected species. The highest frequen...
12
artículo
Publicado 2012
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Transgenic seeds: A bioethics debate? The aim of this paper is to analyze, from a bioethical perspective, the social, cultural, environmental and moral impacts of the use of biotechnology for breeding transgenic crops. We place greater emphasis with regard to the use of transgenic seeds in agriculture, and their advantages and disadvantages compared to traditional crops. Transgenic crops are genetically modified organisms (GMO). There have been two antagonistic views about transgenic crops only due to its definition. We address the issue of transgenic seeds presenting these two views, and make a bioethical analysis that allows us to make a synthesis that may set what could be the most appropriate standing on this issue in light of bioethical principles.
13
artículo
Publicado 2012
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Transgenic seeds: A bioethics debate? The aim of this paper is to analyze, from a bioethical perspective, the social, cultural, environmental and moral impacts of the use of biotechnology for breeding transgenic crops. We place greater emphasis with regard to the use of transgenic seeds in agriculture, and their advantages and disadvantages compared to traditional crops. Transgenic crops are genetically modified organisms (GMO). There have been two antagonistic views about transgenic crops only due to its definition. We address the issue of transgenic seeds presenting these two views, and make a bioethical analysis that allows us to make a synthesis that may set what could be the most appropriate standing on this issue in light of bioethical principles.
14
tesis de grado
Publicado 2024
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Quinoa is a healthy food that possesses high levels of protein that is enriched for dietary essential amino acids. The crop is highly diverse and well-adapted to changing climatic conditions. In spite of being vulnerable to pests and diseases, the development of new resistant varieties is possible. Taking advantage of this genetic variability is crucial for breeding programs, especially to adapt quinoa to the shifting needs of producers. In this study, 25 Peruvian accessions and two commercial varieties were characterized and agronomically evaluated in the Peruvian Pacific desert. Specific methodologies and descriptors of existing crops were used, analyzing a total of 24 quantitative and 23 qualitative variables with 15 repetitions per accession. The data were processed using descriptive statistics and a multivariate analysis. The results showed a high variability in morphological charac...
15
artículo
Publicado 2024
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Continual removal of phosphorus (P) by the crop gradually decreases soil fertility and drives the need for fertilizer inputs for agricultural production. Phytate is considered as the major storage pool for P in the seeds, but its contribution to human nutrition is low. The objective of this study was to characterize quantitative P concentrations (phytate, inorganic P and total P) of 50 native maize genotypes of Zea mays L. of the Patzcuaro lake, Michoacan, Mexico. The average total P and phytate concentration observed across all the genotypes was 3,1, 2,64, and 0,43 mg g-1, respectively. The relationship between phytate and total P was strong (r= 0,98**). This clearly suggests that with an increase in total P there is a corresponding increase in phytate concentration. Cluster analysis of data indicated five distinct groups with 1, 14, 11, 15 and 9 genotypes, respectively. Clusters I and ...
16
artículo
Publicado 2025
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During corn storage, significant losses occur due to pest attacks, especially the weevil, Sitophilus zeamais Motschulsky. This study aimed to evaluate the feeding preference of Sitophilus zeamais on seeds of stored corn genotypes. The tests were carried out in the laboratory of the Center for Scientific and Technological Development in Pest and Disease Management (NUDEMAFI) at the Center for Agricultural Sciences and Engineering of the Federal University of Espírito Santo (UFES) in Alegre, in an air-conditioned room with a maximum temperature of 26.4 and a minimum of 26.2 ºC (± 2 ºC) and humidity between 70% and 75%. A host preference test with free choice was performed on insects from Nudemafi breeding, aged 5 to 10 days, in six (6) arenas with six (6) replicates using a completely randomized design (CRD). After 96 hours, the following were evaluated for each genotype: number of ins...
17
artículo
Publicado 2016
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Tara (Caesalpinia spinosa) is an Andean legume which has an economic importance for their active substances and derivate products. However, there are not morphometric studies which allow characterizing populations to have genetic material for breeding or conservation programs. In the present study morphometric variables are analyzed to identify agro-morphological characteristics which permit differentiate populations. Ten variables of pod and seed from Yauyos and Ayacucho were analyzed; the comparison of means was evaluated using the Mann-Whitney. To determine the relationship between variables a Spearman correlation analysis between populations and taking in account the whole population was performed. According to these results, linear regression models were implemented. Finally, principal component analysis (PCA) was used to visualize patterns in the data. Of the ten variables studied,...
18
artículo
Publicado 2016
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Tara (Caesalpinia spinosa) is an Andean legume which has an economic importance for their active substances and derivate products. However, there are not morphometric studies which allow characterizing populations to have genetic material for breeding or conservation programs. In the present study morphometric variables are analyzed to identify agro-morphological characteristics which permit differentiate populations. Ten variables of pod and seed from Yauyos and Ayacucho were analyzed; the comparison of means was evaluated using the Mann-Whitney. To determine the relationship between variables a Spearman correlation analysis between populations and taking in account the whole population was performed. According to these results, linear regression models were implemented. Finally, principal component analysis (PCA) was used to visualize patterns in the data. Of the ten variables studied,...
19
artículo
Publicado 2025
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La recolección y caracterización del germoplasma son cruciales para la mejora de los cultivos. Veinte accesiones diferentes de sorgo recolectadas en el estado de Kwara, Nigeria, se evaluaron durante dos años (2021 y 2022) en el campo de investigación de la Universidad de Ilorin para determinar su diversidad morfológica y nutricional. Se evaluaron rasgos morfológicos como la estructura de la planta, la orientación de las hojas, las características de la panícula, los atributos de las semillas y componentes nutricionales como carbohidratos, proteínas, grasas y factores antinutricionales (oxalato, fitato, HCN, fenólicos, taninos). El análisis de la varianza reveló que el peso en el momento de la cosecha y el peso del grano presentaban altos coeficientes de variación genotípica (GCV) y fenotípica (PCV) (> 20 %), mientras que otros rasgos morfológicos mostraban valores baj...
20
tesis de grado
Publicado 2022
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The study was based on the influential factors in the agricultural development of the native community of Centro Arenal, District of Punchana. The objective was to determine and analyze the environmental, economic and social factors. The method of observation, descriptive, non-experimental research design (cross-sectional) was used. 40 agricultural producers in the community were surveyed with questionnaires prepared by the thesis student and validated by three specialists. The results indicate that, of the 40 people surveyed, 70% mention that the economic factor is the one that most influences agricultural production, considered high. 2.5% environmental factor, while 12.5% organizational factor and 15% social factor. They cultivate a higher percentage of vegetables, cassava and plantain, in addition to corn. They use their own seed for the production of their crops (75%), they do not us...
