No abstract

The increase of CO2 in the atmosphere can be reduced by capturing them through the photosynthetic process, with special emphasis on fast growing perennial species such as bamboo. The objective of the present study was to quantitatively evaluate the aerial biomass and estimate the carbon content for the species Guadua angustifolia Kunth and Bambusa oldhamii Munro, in commercial plantations established in communities of the Northeast Sierra of Puebla, Mexico. The estimation of population and aerial biomass for both species is tended by a selection of 10 % of plants in one hectare. The samplings were carried out from June 2016 to September 2017. For the plantation of B. Oldhamii Munro, the number of culms per plant gradually increased towards the most recent generations, from 3.6 stems in the most adult cohort to 4.5 in the youngest. The diameter of the stems and their average height show a gradual increase from the older cohorts to the recent cohorts. The total aerial biomass estimated in the plantation of B. oldhamii Munro was 103 403 48 Mgha-1 distributed in the asses of the four years. The total aerial biomass estimated in the plantation of G. angustifolia Kunth is 47 665 11 Mgha-1

Objective: To identify the morphometric and biochemical variation in mango fruits var. Ataulfo (Mangifera indica L.) in two contrasting environments with and without conventional management. Design/methodology/approximation: Morphological and biochemical variables were studied in mango fruits var. Ataulfo in two environments, one of them (La Norteña) with Leptosol soil and Aw climate with conventional agrochemical-based management and the other (Santa Cecilia) on Acrisol soil and Am climate with agroecological management. There were 30 fruits used, all from five trees (n=150) per study garden in a state of commercial maturity. Each fruit was considered as an experimental unit, and morphological and biochemical variables were evaluated for each fruit. Results: Increase in fruit weight, higher pH and increase in total soluble solids, but decrease in pulp weight on site with conventional handling. Increase in pulp content and firmness in fruits from the site without handling. Study Limitations/implications: Changes in the amount and distribution of rainfall in both environments each year. Findings / conclusions: Morphological and biochemical modifications are presented. Greater size and weight, pH and TSS content in the conventional production system, but increased pulp and greater firmness, as well as higher citric acid content in the agroecological system. The results suggest differential effects in mango fruits according to the management and environment where they develop.

Los herbicidas son ampliamente utilizados en la agricultura y se aplican en diversas cantidades que pueden inf luir directa o indirectamente en los microorganismos del suelo y sus procesos. Con el objetivo de evaluar la sobrevivencia de Azospirillum brasilense inoculado en la variedad altiplano de trigo a la aplicación de dos tipos de herbicidas comerciales, un organoclorado y otro organofosforado, se estableció el presente experimento en la Ecozona de la Universidad de las Américas-Puebla, México, en condiciones de invernadero en 2009. Las semillas se inocularon antes de la siembra con Azospirillum brasilense y los herbicidas se aplicaron 40 días después. Se establecieron los tratamientos: 1) plantas sin inocular (testigo absoluto); 2) inoculación con Azospirillun (testigo inoculado); 3) inoculación con Azospirillum más aplicación de herbicida 2, 4, D, (organoclorado): 4) inoculación con Azospirillum más aplicación de herbicida glifosato (organofosforado); 5) sin inoculación y aplicación de herbicida 2, 4, D; y 6) sin inoculación y aplicación de glifosato, en un diseño completamente al azar con diez repeticiones. Se registró la sobrevivencia de la bacteria en el sistema radical mediante la técnica número más probable y en la planta se registró su altura y peso. Los resultados indican que los dos herbicidas (2, 4, D y glifosato), no afectaron de manera significativa la población de Azospirillum presente en la raíz. Las plantas inoculadas con la bacteria, con o sin tratamiento de herbicida registraron mayor biomasa en comparación con las plantas sin inocular. La biomasa se incrementó con la aplicación 2, 4, D.

No abstract