Sugarcane is one of the main crops worldwide, and it has an important impact on environmental issues. A bibliometric mapping analysis of the research on sugarcane was carried out, using data on the titles, abstracts, and keywords of articles published in leading journals and other peer-reviewed documents available in the SCOPUS database from 1858 to 2019 (27 August), and this was subsequently analyzed with the software VOSviewer. The three most important countries that publish research and were most-cited regarding sugarcane were Brazil, the USA, and India. The analysis of the co-occurrence of terms shows that the main research areas were sugarcane bagasse and terms related to bioenergy, and on a second level of relevance agronomy topics related to increasing crop yields. This first attempt to visualize the abundance of publications regarding sugarcane in their totality is in itself a good starting point for further scientific discussion.

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The use of microorganisms for biological pest control as biological control agents (BCAs) and biopesticides was developed worldwide in the 1960s. Despite the abundance of reviews published on this topic, no meta-analysis using bibliometric tools has been published. The objective of this study was to determine patterns of research on microorganisms for the biological control of pests, based on publications available in the SCOPUS® database. The data were obtained from the Elsevier® Scopus meta-database using the search terms “biological pest control” and “microorganism” (title, abstract, and keywords). The main publications were identified, along with the journals, countries, and institutions that have published on the subject. The data were analyzed with VOSviewer to determine the co-occurrence of terms, and four maps were generated. The results show two phases in the scientific research on the subject: The first is the characterization of biological control agents, and the second is focused on the commercial development of biopesticides and biological control agents. The most recent research emphasizes the discovery of new species and strains that have commercial potential, with an emphasis on genetic engineering and biotechnology.

This study documents the socioeconomic impact of an innovation based on the marketing of live aquaculture products in rural communities as the Live Tilapia Points of Sales (LTPOS). A case study research conducted where the participatory strategy of "Simultaneous Production Growth Groups" (SPGG) was applied for technology innovation, which includes technology modules, organizational strategy and operational management. The results were evaluated socially and economically. In 14 months, 3531.50 kg of live tilapia were distributed in four local places for sale and self-consumption. The system obtained a BCR of 1.23 and offered as well to the rural population an alternative of fish consumption in better freshness conditions than the regular fish supply. It brings up an extra income to the main market chain participants and development of aquaculture capabilities. Therefore, the LTPOS is a viable option for diversifying livelihoods and improving regional rural population income.

En México, la apertura de nuevas zonas agrícolas propicia la pérdida de especies de aves. Para conocer el rol de sistemas agrícolas con labranza de conservación cero-cerco vivo (LCC-CV) en el mantenimiento de la diversidad-uso de hábitat por la avifauna, durante junio-septiembre de 2014, se realizó un monitoreo de aves en el centro-norte de México. La riqueza de especies se analizó con Jacknife1, la similitud con Sorensen, Conglomerados, la abundancia con un modelo Log-normal, c2, la diversidad con Shannon-Wiener y las posibles diferencias en dichos parámetros con Kruskal-Wallis. El uso de hábitat en los planos vertical (estratos)-horizontal (sustratos) se infirió con la frecuencia de observación (FO) y regresión Poisson (ARP). En los sistemas (LCC-CV) se registraron 52 especies de aves, distribuidas en cinco órdenes, 19 familias y 10 subfamilias. Los resultados promedio de Jacknife1 para UE’s fue de 38.7%, Sorensen 31%; asimismo, se conformó un Clúster con tres subamalgamaciones (mínima, e= 2.7; máxima, e= 3.6); Log-normal (c2= 130.09, Y= 0.3518, 3 gdl), c2 (p-value= 0.028); Shannon-Wiener H’= 2.99; Kruskal-Wallis de p-value= 0.0248, 0.028, 0.4232, respectivamente. Las FO sugieren que el estrato-sustrato más utilizado fue el superior (46.15%)-vuelo (27.95%). El ARP para estrato, comportamiento, sexo, edad, sustrato indicó que 2, 4, 1, 2 y 6 variables presentaron coeficientes significativos. México enfrenta el problema de apertura de tierras a la agricultura, las zonas áridas y semiáridas no escapan a este fenómeno, por ello, los sistemas de LCC-CV constituyen una opción para mantener y conservar la avifauna.

No abstract

Este trabajo analizó las volátiles mediante la obtención de extractos de hojas verdes de caña de azúcar en estado maduro de ocho variedades de caña de azúcar y de dos especies de pastos mediante hidrodestilación con una trampa Clevenger. Las variedades de caña de azúcar utilizadas en este estudio fueron: CP 72-2086, MEX 69-290, RD 75-11, ITV 92-1424, MEX 79-431, L 77-50, COLPOS CT MEX 05-223, COLPOS CT MEX 05-204. Los pastos evaluados fueron: zacate peludo (Rottboellia cochinchinensis) y pasto estrella africana (Cynodon nlemfuensis). En el material evaluado se encontraron tres compuestos principales, estos son: (Z)-3-hexen-1-ol, 1-octen-3-ol y fitol. Estos compuestos fueron más representativos en las variedades CP 72-2086 y MEX 69-290. El compuesto con mayor frecuencia fue el (Z)-3-hexen-1-ol, que estuvo presente en siete variedades al igual que en los dos pastos evaluados. La abundancia de (Z)-3-hexen-1-ol en las muestras de las variedades de caña de azucar varia desde 20.35% hasta 57.36%, la mayor cantidad de (Z)-3-hexen-1-ol se detecto en el pasto estrella africana con una abundancia de 59.69%.

In the state of Veracruz, Mexico, the performance of the Tilapia (Oreochromis spp.) production system in the domestic market has been declining. Recent production results are lower than those presented in 1999, revealing that the production model adopted and used since 2001 is ineffective as a development strategy. The reason for the failure is that the model considers the technological production process as the central element of aquacultural competitiveness, without considering that production practices, marketing and consumption of goods are performed by individuals who decide and control their actions and are motivated by the values shared with their social group. This interpretation reveals the need for a new complementary conceptual framework, considering the system of production and consumption as a social self-referencing system. Thus, in this article, a model of an agricultural food-chain with a sociopoietic territorial focus on the development of the aquaculture subsector is outlined. The model is based on constructs having the following theoretical dichotomies: territorial agrifood, neo-institutional business, sociopoiesis and individual motivation.