Requeriments tèrmics i dinàmica de població de Meloidogyne spp. En cogombre i pèrdues de producció en hivernacle

Es van dur a terme diversos estudis per a determinar: a) els requeriments tèrmics necessaris perquè Meloidogyne incognita i M. javanica completin un cicle de vida en cogombre, considerant dues etapes del cicle: entre la inoculació del sòl amb formes juvenils a l’inici de la producció d’ous, i de l’inici de la producció d’ous a l’inici d’emergència de juvenils de la generació següent; b) la taxa màxima de multiplicació i la densitat d’equilibri de M. incognita en cogombre, i c) les pèrdues de producció del cogombre conreat de juliol a novembre en hivernacle.Postprint (published version

Dinámica de población de Meloidogyne spp. en cultivos protegidos y pérdidas de producción de pepino, calabacín, sandía y tomate susceptible y resistente

Se realizaron estudios en invernaderos infestados con Meloidogyne incognita o M. javanica, y que presentaban gradientes de infestación entre 0 y 11800 juveniles 250 cm-3 de suelo, para determinar la tasa máxima de multiplicación del nematodo (TMM), la densidad de equilibrio de la población (DE) y el efecto sobre la producciónPostprint (published version

Recicland, demostration on the management of organic and inorganic waste from agriculture

La agricultura protegida que se desarrolla principalmente en el litoral oriental andaluz es una actividad de gran importancia económica y social para Andalucía. Sin embargo, el crecimiento exponencial de la superficie de invernadero ha dado lugar a un incremento del volumen de residuos agrarios. Además, este sistema agrícola está evolucionando hacia nuevas técnicas de cultivo que implican, no sólo la generación de residuos, sino también una mayor diversificación que hace más complicada su gestión. El principal problema para la gestión de estos residuos agrarios no está sólo en su dispersión geográfica, sino también en su estacionalidad, ya que se genera gran cantidad en determinados periodos anuales, coincidiendo con la finalización de las campañas agrícolas. Por este motivo, la capacidad máxima de recogida y almacenamiento y el proceso de gestión están condicionados por el volumen generado al finalizar los ciclos de cultivo. En este contexto, surge el proyecto RECICLAND que pretende palear dichos problemas y contribuir a la gestión sostenible de los residuos generados en los procesos productivos. Concretamente, el objetivo general de este proyecto es desarrollar actividades demostrativas piloto, informando de modo práctico sobre diferentes técnicas para la gestión específica de residuos inorgánicos y restos vegetales. Para ello, se ha establecido un área de reciclaje, junto con actividades de transferencia (jornadas prácticas, visitas, vídeos demostrativos y publicaciones) en el Centro IFAPA La Mojonera (Almería).Protected agriculture, which takes place mainly on the eastern coast of Andalusia, constitutes the major economic and social activity for this region. However, greenhouse area exponential growth has led to an increase in the volume of agricultural waste. In addition, this agricultural system is evolving towards new cultivation techniques that not only involve the generation of waste, but also a greater diversification that makes its management hard to tackle. The main issue regarding management of this agricultural waste is not only its geographical dispersion, but also its seasonality, as a large quantity is generated during certain periods of the year, coinciding with the end of agricultural campaigns. Indeed, the maximum collection and storage capacity and the management process itself are conditioned by the volume generated at the end of cropping cycles. In this context, the RECICLAND project arises, which aims to alleviate these problems and contribute to the sustainable management of the waste generated in the production processes. Specifically, the general objective of project is to develop pilot demonstration activities, providing practical information on different techniques for the specific management of inorganic waste and plant debris. For this purpose, a recycling area has been set up, where transference activities such as practical workshops, guide visits, demonstration, videos, and publications are being carried out in IFAPA La Mojonera (Almería)

Damage functions of meloidogyne javanica on zucchini squash and relative leaf chlorophyll content

Yield losses in cucurbits have been reported in many horticultural regions. Zucchini-squash is an important crop in southern Spain accounting for one third of the production in the country. For sustainable management of root-knot nematodes in susceptible crops, it is essential to develop accurate information on population densities that cause yield losses and quantify them into plant damage functionsPostprint (published version

Damage functions of meloidogyne javanica on zucchini squash and relative leaf chlorophyll content

Yield losses in cucurbits have been reported in many horticultural regions. Zucchini-squash is an important crop in southern Spain accounting for one third of the production in the country. For sustainable management of root-knot nematodes in susceptible crops, it is essential to develop accurate information on population densities that cause yield losses and quantify them into plant damage functionsPostprint (published version

Damage functions of meloidogyne javanica on zucchini squash and relative leaf chlorophyll content

Yield losses in cucurbits have been reported in many horticultural regions. Zucchini-squash is an important crop in southern Spain accounting for one third of the production in the country. For sustainable management of root-knot nematodes in susceptible crops, it is essential to develop accurate information on population densities that cause yield losses and quantify them into plant damage function

Technological capability building and learning in the developing world The experience of African telecommunication companies

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Population dynamics of Meloidogyne javanica and its relationship with the leaf chlorophyll content in zucchini

The relationship between the initial (Pi) and final (Pf) population densities of Meloidogyne javanica in response to increasing initial inoculum levels and the effect on yield in zucchini cv. Amalthee (Cucurbita pepo L.) was determined using a geometric series of 12 Pi from 0 to 51,200 eggs/100 cm(3) of soil in pot experiments in a greenhouse. The maximum multiplication rate was 425, and the equilibrium density was 701,951 eggs/100 cm(3) soil. The relative yield, represented as dry top weight, fit the Seinhorst damage function model and the minimum relative yield (m) was 0.82 and the tolerance limit (T) was 402 J2/100 cm3 soil. Regression analyses indicated a negative relationship between the Pi and the leaf chlorophyll content (LCC) 40, 50, 60, and 70 days post-inoculation. The Pi and LCC fit the Seinhorst damage-function model. Zucchini cv. Dyamant was planted in a plastic greenhouse with a range of M. javanica Pi from 0 to 861 J2/100 cm3 soil. The maximum multiplication rate of M. javanica under field conditions was 3093, and the equilibrium density was 1485 J2/100 cm(3) soil. The relationship between Pi and relative yield, represented as fruit weight, fit the Seinhorst damage function model (P <0.0001, R-2 = 0.78); m was 0.48, and T was 0.02 J2/100 cm(3) soil. (C) 2014 Elsevier Ltd. All rights reserved

A new theory of nematic liquid crystal mixtures

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