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Search Results: 1 - 10 of 2089 matches for " Rigoberto;Navarrete Maya "
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Rendimiento y reacción a enfermedades en frijol tipo Flor de Mayo en riego y temporal
Acosta Gallegos, Jorge Alberto;Sánchez Garcia, Bertha María;Mendoza Hernández, Francisco Manuel;Jiménez Hernández, Yaneth;Salinas Pérez, Rafael;Rosales Serna, Rigoberto;Navarrete Maya, Rosa;Zandate Hernández, Román;Alvarado Mendoza, Simón;Padilla Ramírez, José Saúl;
Revista mexicana de ciencias agrícolas , 2010,
Abstract: the 'flor de mayo' bean type is highly demanded by consumers in central mexico, its production takes place at the semiarid, el bajio and the central plateau regions. the aim was to test a set of 14 bred lines plus two checks across 10 rainfed locations and four irrigated sites on the basis of seed yield, 100-seeds weight and disease reaction. trials were conducted in the spring-summer season 2008 and fall-winter season 2008-2009. data analyses were conducted including all test sites, and independently rainfed and irrigated sites. different diseases attacked the crop across test sites; those widely distributed were common bacterial blight (xanthomonas campestris pv phaseoli) and angular leaf spot (phaeoisariopsis griseola); whereas anthracnose (colletotrichum lindemuthianum) and downy mildew (phythohpthora phaseoli) show a strong attack at calera, zacatecas and celaya, guanajuato, respectively. average from the genotypes, the highest yield (4.15 t ha-1) was obtained in celaya under irrigated conditions and the lowest at texcoco under rainfed conditions (0.90 t ha-1). the overall analysis indicated highly significant effect (p<0.0001) of environment, genotype and interaction, but the largest contribution to the observed variation was due to location (91%) and the lowest to genotype (1%). the analyses on rainfed data show a lower effect of location (72%) and an increase in the effect of the interaction (25%) and in lower degree that of the genotype (3%). out of fourteen trials, in six of them there were lines significantly superior (p<0.05) to the best check, flor de mayo anita. average from all trials, line fmb 08030 displayed the largest yield (2.06 t ha-1). at all trials most of the lines displayed heavier seeds (p<0.05) that the checks. for seed yield, the effect of location was the most influential and under rainfed conditions the interaction location x genotype was important.
"Resistencia de frijol al tizón de halo en el valle de méxico y progreso de la enfermedad"
Rosa Navarrete Maya,Jorge Alberto Acosta Gallegos
Revista fitotecnia mexicana , 2000,
Abstract:
Dinámica de los tizones común y de halo del frijol en el Valle de México
Prudencio-Sains, José Manuel;Navarrete-Maya, Rosa;Navarrete-Maya, Jorge;Acosta-Gallegos, Jorge Alberto;
Agricultura técnica en México , 2008,
Abstract: the objectives of this research were 1) to study the dynamics of the diseases bean common and halo blight during the crop cycle at the valley of mexico, under rainfed conditions and 2) to identify resistant cultivars to both bacterial diseases. eleven bean cultivars, from different origin and contrasting growth habit, were sown on june 10, 2001 at texcoco, state of mexico. incidence and disease severity were recorded at different growth stages and the incidence rate and area under disease progress curve (audpc) were also estimated. all cultivars showed incidence of both diseases, that of halo blight was higher than 50% from the end of flowering onwards, and common blight reached the same level until the beginning of seed filling. there was not relationship between disease susceptibility and cultivar growth habit. seed yield was negatively affected by the development of both diseases and halo blight had a larger negative impact. the audpc described with major precision the effect of the diseases on the bean crop, in comparison with punctual readings of incidence and severity. tolerant cultivars against both diseases were bayo madero, negro 8025 and pinto villa.
Reacción de genotipos de frijol a Fusarium spp. y Rhizoctonia solani bajo condiciones de campo e invernadero
Navarrete-Maya, Rosa;Trejo-Albarrán, Evangelina;Navarrete-Maya, Jorge;Prudencio-Sains, José Manuel;Acosta Gallegos, Jorge Alberto;
Agricultura técnica en México , 2009,
Abstract: the root rot induced damage caused by r. solani and fusarium spp. affects common bean (phaseolus vulgaris l.) production at the highlands of mexico. to identify bean genotypes resistant to both fungi, two experiments were conductedunderfieldand greenhouse conditions. in the field, under rainfed conditions, 15 bean genotypes were planted on july 24 2001, at texcoco, state of mexico. incidence and attack severity were determined at the phenological stages v3, r5, r7 and r8; also, daily temperature and precipitation were recorded. the same genotypes were planted under greenhouse conditions on july 27th, 2001 in pots with soil from the same site. plant samples were collected from all genotypes for isolation and identification of fungi causing root rots. both,r. solani and fusarium spp. were recovered. under field conditions, root rots were observed throughout the cycle, with the greatest severity at the r5 and r7 stages, no immune genotypes were observed. cultivar negro tacana showed intermediate resistance to fusarium spp. and g 12729 (a wild genotype) was resistant during the early phenological stages. under greenhouse conditions, any genotype showed a consistent resistance pattern during the cycle. atthe field, the attack by r. solani was less severe than that of fusarium spp., whereas in the greenhouse the attack r. solani was severe. atthe field, cultivars pinto villa, wisc rrr, pi 203,958 and bat 477 were intermediate and consistent in its response to both fungi; however, were susceptible in the greenhouse. the disease incidence and severity on the genotypes showed differences related to climatic conditions registered during the growth cycle.
Optimal Stochastic Pine Stands Harvest Rotation Policies  [PDF]
Eduardo Navarrete
Open Journal of Forestry (OJF) , 2015, DOI: 10.4236/ojf.2015.56053
Abstract: A new Faustmann optimal rotation harvesting stands’ problem under Brown geometric price and Logistic and Gompertz wood stock, diffusions is presented. The optimal cut policies for the stochastic Faustmann model and the single harvest rotation or Vicksell model are evaluated in the case of a Chilean Radiata pine forest company. The company cut policy validates the Vicksell model, its optimal cut policies overestimate the company policy cut in 1.2%, in the Gompertz case, and underestimate it in 2.3%, in the Logistic case. The Faustmann optimal cut policies present a larger underestimation of the company cut policy in 10.1%, in the Gompertz case, and in 21.5%, in the Logistic case. The preference for shorter evaluation period that the company shows is due to the organizational risk that the forest economic sectors has in Chile.
Accurate solution estimates for vector difference equations
Rigoberto Medina
International Journal of Mathematics and Mathematical Sciences , 2003, DOI: 10.1155/s016117120321022x
Abstract: Accurate estimates for the norms of the solutions of a vector difference equation are derived. They give us stability conditions and bounds for the region of attraction of the stationary solution. Our approach is based on estimates for the powers of a constant matrix. We also discuss applications of our main results to partial reaction-diffusion difference equations and to a Volterra difference equation.
Estimates for the norms of solutions of delay difference systems
Rigoberto Medina
International Journal of Mathematics and Mathematical Sciences , 2002, DOI: 10.1155/s0161171202013017
Abstract: We derive explicit stability conditions for delay difference equations in ℂn (the set of n complex vectors) and estimates for the size of the solutions are derived. Applications to partial difference equations, which model diffusion and reaction processes, are given.
Estimates for the norms of solutions of difference systems with several delays
Rigoberto Medina
International Journal of Mathematics and Mathematical Sciences , 2004, DOI: 10.1155/s016117120430801x
Abstract: We derive explicit stability conditions for time-dependent difference equations with several delays in Cn (the set of n complex vectors) and estimates for the size of the solutions. The growth rates obtained here are not necessarily decay rates.
El arte de pensar sin paradigmas
Lanz,Rigoberto;
Enlace , 2007,
Abstract: this essay makes a very analytical and critical reflection about the paradigm crisis of modern rationality. namely, a crisis that undermines the "fundamentals" of what was once understood as scientific reason, epistemic subject, progress in history and education. the uniformity of thought organized in disciplines, in a normative of empirical and causal explanation, in a vision of reality from "meta-stories", has come to an end. postmodern thought attempts to offer an exit out of this crisis from another understanding and hermeneutic of complex, non-linear sense for our perception of reality. uncertainties create new random, weak and instant movements, that break the unifying rationality of modernity and give way to post-modernity?s deconstructive rationality, that proposes the a recreational task of generation of new knowledge.
Lo político transfigurado. Estrategias para entrar al mundo postmoderno
LANZ,Rigoberto;
Utopìa y Praxis Latinoamericana , 2006,
Abstract: abstract this is a reflection from the external vertex, which could be understood as the people category, in an ideological, political, social, cultural and historic sense. it is more than an intellectual, elite, class or left or right wing messianic vanguard-ism, it is each one of us who at some moment or in some manner call ourselves the people, and find ourselves confronted in the present or future with the destiny of social reality. in a very different manner from colonial times, we can interpret now, from the trans-disciplinary science of social sciences, or from the post-modern vision, the de-construction of peoples, and the liberation of repressive contents through liberating actions. we must become aware of the new dimension that protagonism is creating in what is latin american politics.
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