Soil water management: evaluation of infiltration in furrow irrigarion systems, assessing water and salt content spatially and temporally in the Parc Agrari del Baix Llobregat area.

摘要: Sustainability of irrigated agriculture is a growing concern in the Baix Llobregat area. Although land accounts for substantial proportion food supply to local market, it has been, and still increasingly degraded by poor agricultural management. This dissertation focuses on ways evaluate furrow irrigation assess soil water content salinity (temporally spatially) under usual farmers's management practices. This meets these goals through an extensive study relevant literature implementation practical research. The latter was carried out with case representative fields Empirical stochastic models were applied as well monitor flow solute transport root zone. research produced number key findings: first, evaluating confirmed that 40-43 % would have been saved if stopped soon deficit fully recharge taking amount needed salt leaching into account, application efficiency (AE) increase from 48% 84% 41% 68% (Field 1 Field 2, respectively). Second, predictions using ARIMA logical, next time its effect at depth interest correctly estimated. Third, considering linear relationship eb-sb, transforming Hilhorst (2000) model, which based deterministic time- varying Dynamic Linear Model (DLM) enabled us validate this field conditions. An offset esb=0 value derived ensure accurate prediction sp measurements sb. It shown varied each same profile. A reason might be changes temperature along then calculated Fourth, (multiple input – single output) transfer function results showed had significant impact salinity, predicted temperature, Finally, applying analysis variance (ANOVA), frequency, according farmer's practice, statistically effects behaviour, depending position (furrow, ridge). Moreover, end crop's cycle farmers left less depth, than beginning cycle.