Guías de fertirriego para riego por surcos

A mathematical model was developed to simulate the application efficiency and uniformity of water-soluble fertilizers through furrow irrigation. The model simulates solute mass balance and transport for one-dimensional unsteady flow during the advance and post-advance phases of a furrow irrigation event. The model was programmed to determine the best timing and duration of fertilizer injection using two performance indices: solute application efficiency and solute application uniformity. The results from the model were compared with two sets of field data and were found to be in close agreement in terms of advance trajectories and surface water solute concentrations. Nearly 50,000 simulations were performed with the model and the results were analyzed in terms of best injection start and end times for fertilizer application efficiency and uniformity. It was found that the best injection duration time was from 5 to 15% of the time of cutoff for a complete irrigation. Most of the cases showed that the injection should take place in a relatively short time span, and at a relatively high injection rate.Se desarrolló un modelo matemático para simular la eficiencia de aplicación y uniformidad de fertilizantes solubles a través del riego por surcos. El modelo simula el balance de masa y transporte de solutos en flujo transitorio de una dimensión durante las fases de avance y humedecimiento del riego por surcos, y fue diseñado para determinar la mejor programación de la inyección de fertilizantes a través de dos índices: eficiencia de aplicación y uniformidad de soluto. Los resultados del modelo fueron comparados con dos conjuntos de datos de campo y coincidieron estrechamente en términos de trayectoria de avance de agua y concentración superficial del soluto. Con el modelo se realizaron casi 50.000 simulaciones. Se determinó que la mejor duración de la inyección fue del 5 a 15% del tiempo de corte de agua para un riego completo. En la mayoría de los casos se manifestó que la inyección debe ser realizada en un período relativamente corto y a una tasa relativamente alta

Fertigation guidelines for furrow irrigation

A mathematical model was developed to simulate the application efficiency and uniformity of water-soluble fertilizers through furrow irrigation. The model simulates solute mass balance and transport for one-dimensional unsteady flow during the advance and post-advance phases of a furrow irrigation event. The model was programmed to determine the best timing and duration of fertilizer injection using two performance indices: solute application efficiency and solute application uniformity. The results from the model were compared with two sets of field data and were found to be in close agreement in terms of advance trajectories and surface water solute concentrations. Nearly 50,000 simulations were performed with the model and the results were analyzed in terms of best injection start and end times for fertilizer application efficiency and uniformity. It was found that the best injection duration time was from 5 to 15% of the time of cutoff for a complete irrigation. Most of the cases showed that the injection should take place in a relatively short time span, and at a relatively high injection rateSe desarrolló un modelo matemático para simular la eficiencia de aplicación y uniformidad de fertilizantes solubles a través del riego por surcos. El modelo simula el balance de masa y transporte de solutos en flujo transitorio de una dimensión durante las fases de avance y humedecimiento del riego por surcos, y fue diseñado para determinar la mejor programación de la inyección de fertilizantes a través de dos índices: eficiencia de aplicación y uniformidad de soluto. Los resultados del modelo fueron comparados con dos conjuntos de datos de campo y coincidieron estrechamente en términos de trayectoria de avance de agua y concentración superficial del soluto. Con el modelo se realizaron casi 50.000 simulaciones. Se determinó que la mejor duración de la inyección fue del 5 a 15% del tiempo de corte de agua para un riego completo. En la mayoría de los casos se manifestó que la inyección debe ser realizada en un período relativamente corto y a una tasa relativamente alt

Irrigation evaluation based on performance analysis and water accounting at the Bear River Irrigation Project (U.S.A.)

The purpose of this work is to contribute to the development of a combined approach to evaluate irrigated areas based on: (1) irrigation performance analysis intended to assess the productive impacts of irrigation practices and infrastructures, and (2) water accounting focused on the hydrological impacts of water use. Ador-Simulation, a combined model that simulates irrigation, water delivery, and crop growth and production was applied in a surface irrigated area (1213 ha) located in the Bear River Irrigation Project, Utah, U.S.A.. A soil survey, a campaign of on-farm irrigation evaluations and an analysis of the database from the Bear River Canal Company and other resources were performed in order to obtain the data required to simulate the water flows of the study area in 2008. Net land productivity (581 US$ ha-1) was 20$ m-3. In addition, two strategies for increasing farm productivity were analyzed. These strategies intended to improve water management and infrastructures raised on-farm IE to 90% reducing the gap between current and potential productivities by about 50%. Water diverted to the project was reduced by 2.64 Mm3. An analysis based on IE could lead to think that this volume would be saved. However, the water accounting showed that actually only 0.91 Mm3 would be available for alternative uses. These results provide insights to support the decision-making processes of farmers, water user associations, river basin authorities and policy makers. Water accounting overcomes the limitations and hydrological misunderstandings of traditional analysis based on irrigation efficiency to assess irrigated areas in the context of water scarcity and competitive agricultural markets.Land productivity Surface irrigation Water accounting Water balance Water consumption Water depletion Water management Water productivity

USU irrigation main system hydraulic model: Replication of modeling capability in other countries

This report concerns the requirements for replicating the capability for hydraulic modeling of irrigation main systems with the USU Main System Hydraulic Model at different project sites and different countries. The computerized model was developed at Utah State University (USU) under the Water Management Synthesis II Project, funded and assisted by USAID through the Consortium for International Development. The information contained herein complements that which is found in the user's manual for the mode

Observations and recommendations on the current state of agricultural irrigation in Brazil: Consultant final report IICA/EMBRAPA PROCENSUL II

80 páginasThe report contains findings and recommendations on the research and practice of irrigated agriculture in Brazil. The report presents five sections. Initially, it contains a description of visits to the several EMBRAPA research centers and to some of the irrigated regions and projects in the country. The discussion section contains some observations and comments on topics, important in policy and research areas for Brazil. A summary of the major comments and recommendations are presented in section 5