To evaluate the effects of limited water supplies on production, a one year drought was simulated in 1989 on mature conventionally spaced cv. Chico walnuts. Controlled deficit irrigation (CDI), an irrigation strategy that imposes water deprivation during stages of the season when the trees are considered most tolerant of water stress, was used to apply 16 acre-inches/acre (hereafter referred to...

Irrigation scheduling is an important decision problem in agriculture. The purpose of the study presented in this paper is to compare dynamic programming (DP) and reinforcement learning (RL) methods for identifying optimal starting irrigation strategies, when a limited amount of water is available for irrigation. Both of the optimization methods use the MODERATO simulator, which includes a grow...

todays, productivity and efficiency of irrigation have been in the center of the many water-related issues. by using sprinkler irrigation systems in addition to watering easier and automatic, that is a device for raising water application uniformity and efficiency which ultimately will save water consumption and production increase. in this study, four fixed irrigation systems of khorramabad ci...

1172 P in the vadose zone is nonuniform fl ow that can cause water and solute movement to bypass much of the soil matrix, often resulting in greater water fl uxes and shorter solute transit times than expected (Flury et al., 1994). Understanding preferential fl ow is crucial for quantifying aquifer susceptibility, defi ned as the inherent hydrogeologic properties that control the occurrence of ...

water shortage in the agricultural sector is currently a major challenge in crop production. the more efficient water usage is that which increases yield without increasing water use. thus, a determination of the water-yield relationship is essential. a field study was conducted to examine water-yield relations in three genotypes of soybeans, including optimum irrigation depth, a comparison of ...

Water is essential for life. Specifically in the oases of inland arid basins, water is a critically limited resource, essential for the development of the socio-economy and the sustainability of eco-environmental systems. Due to the unique hydrological regime present in arid oases, a moderate groundwater table is the goal of sustainable water management. A shallow water table induces serious se...

evaporation from the soil surface has an important role in the water balance model in nature, so that the major part of rain fall and irrigation water in arid and semi-arid regions is lost via evaporation from the soil surface. in such areas, there are some regions with high water table and because of evaporation from the soil surface, salts accumulation also occur in the soil surface. so evapo...