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Gonzalez-Andujar J.L.,CSIC - Institute for Sustainable Agriculture | Bastida F.,University of Huelva | Calvo R.,Servicio de Biometria | Izquierdo J.,University of Barcelona | Lezaun J.A.,ITGA
Weed Research | Year: 2011

Field studies were conducted at five locations in North and East Spain to evaluate the agronomic, economic and environmental implications of a decision support system (LOLIUM-PC) for herbicide control of Lolium rigidum in winter cereals. The chemical control treatments evaluated were as follows: (i) LOLIUM-PC-based recommendations, (ii) full herbicide dose (standard farmer practice) and (iii) half herbicide dose. Results indicate that there were no statistically significant differences, within sites, between treatments with respect to weed density, crop yield and economic return. On average, LOLIUM-PC resulted in less herbicide application compared with the full herbicide dose treatment. This also was true in three of five localities for the half-dose treatment. The results of this research indicate that LOLIUM-PC provides a flexible tool for recommending less herbicide than other herbicide decision systems, adequate weed control and similar crop yields to those obtained with the standard farmer practice (full dose) in Spain. © 2011 The Authors. Weed Research © 2011 European Weed Research Society. Source

Gonzalez-Andujar J.L.,CSIC - Institute for Sustainable Agriculture | Bastida F.,University of Huelva | Calvo R.,Servicio de Biometria | Gonzalez-Diaz L.,CSIC - Institute for Sustainable Agriculture | And 4 more authors.
Weed Research | Year: 2010

Two field studies were conducted in Central and Northern Spain over a total of five seasons to assess the usefulness of a decision support system (AVENA-PC) from agronomic, economic and environmental points of view on herbicidal control of Avena sterilis ssp. ludoviciana in winter wheat. The control treatments evaluated were: (i) AVENA-PC-based recommendations, (ii) full herbicide dose (standard farmer practice), (iii) half herbicide dose and (iv) no herbicide. The herbicide rates used in the AVENA-PC treatment averaged 65% and 30% lower than the full and half dose treatments respectively. AVENA-PC implementation controlled A. ludoviciana with similar efficacy as standard herbicide treatments. Nevertheless, it did support a reduction in relation to the non-herbicide treatment. Yields obtained with AVENA-PC were, in general, not statistically different to those obtained with herbicide treatments and were on average 69% higher than those in the no herbicide application strategy. Comparing AVENA-PC economic performance with the other treatments there were, in general, no significant statistical differences in Central Spain. In Northern Spain, all herbicide treatments had similar net returns, with there being no statistical differences between AVENA-PC and the herbicide treatments. However, there were differences recorded with the non-herbicide treatment. The results of this research indicate that AVENA-PC, due to its flexibility, may recommend less herbicide than the standard farmer practice, providing clear environmental benefits and adequate weed control with maintained crop yield and net returns similar to standard farmer practice. © 2010 European Weed Research Society. Source

Miralles de Imperial R.,Servicio de Biometria | Martin J.V.,Servicio de Biometria | Rodriguez C.,Servicio de Biometria | Calvo R.,Servicio de Biometria | Delgado M.M.,Servicio de Biometria
Revista Internacional de Contaminacion Ambiental | Year: 2011

Forage sorghum could be an efective alternative crop for energy purposes in areas where water irrigation are limited. The ability of regrowth after cutting of this crop can enhance biomass production. The sorghum stems sugar content could be an added value for bioethanol production. Trial was carried out in a greenhouse with forage sorghum (Sorghum bicolor (L.) Moench) cv. Digestivo. Two sorghum plants (plant V and plant A) were cultivated per pot. The aim in this work was to study the effect of two fertilizer treatments: straw broiler litter (STBL) and sawdust broiler litter (SBL) at rates: 0, 1 and 2 and a mineral fertilizer treatment (M) N-P-K, 15-15-15, equivalent in N at rate 1. The variables studied were: total plant biomass V (green cutting plant + regrowth) (biomass V), total biomass plant A (mature plant + tillering) (biomass A) and in order to evaluate the sugar content of sorghum stalks we studied the variable percent (%) degree Brix ( oBx): in green plant V ( oBx V) and in mature plant A ( oBx A). We made a two-way analysis of variance (treatment and rate) for STBL and SBL. Treatment and rate were significant in biomass V and only rate for oBx V. Treatment x rates were not significant in the variables studied: biomass V, biomass A, oBx V and oBx A. In this trial the highest dry matter (d.m.) biomass A were obtained with rate 1 for STBL and SBL but in case of d.m. biomass V were obtained with rate 0, control (C). The highest oBx values were obtained with C in both plants; the oBx V were double than the oBx A. Sorghum had a positive response to fertilization with poultry manure with rate 1 to d.m. of plant biomass (A) but in d.m. green plant biomass (V) better results were obtained with C. The sugar content in juice stems ( oBxV and oBxA) was in all cases highest in control with rate 0. Source

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