Publicado ahead of print 01 julio 2019
IRRIGATION MANAGEMENT IN PEAR (Pyrus communis) cv. WILLIAMS GROWN IN SOIL WITH A SHALLOW WATER TABLE
Juan Oreste Galeazzi1* y María Cristina Aruani1
The Rio Negro and Neuquén Upper Valley is an intensive fruit producing area under irrigation. The presence of a shallow water table modifies water content in the soil profile. The aim of this trial was to develop an irrigation scheduling program for ´Williams´ pears grown on a non-saline soil with a shallow water table, and to compare this management program to the conventional management system applied by the grower. Soil water content was determined during three consecutive crop cycles using sensors; measurements were made at three depths and water tables. The capillary flow was determined using UPflow software. The water balance and irrigation program were performed using WinIsareg software, considering no water restrictions and optimum soil moisture conditions for the crop. The water balance was adjusted to the soil water content recorded by the sensors, resulting from the irrigations performed and the influence of a shallow water table. The water table level fluctuated between 0.70 m and 1.30 m depth. The capillary flow ranged from 1.0 mm day-1 to 5.2 mm day-1. The cumulative evapotranspiration (ETm) calculated with WinIsareg was 1098 mm with a scheduling program of fourteen irrigations. The net irrigation depth was 409 mm because the capillary contribution balanced 63% of the ETm, decreasing the average water use from 0.71 Ls-1 ha-1 to 0.26 L s-1 ha. WinIsareg and UPflow softwares proved to be reliable to adjust an irrigation scheduling program under shallow water table conditions.
Key words: hydrological models, capillary flux, irrigation scheduling
1 Universidad Nacional del Comahue (UNCo), Facultad de Ciencias Agrarias, Ruta 151, km 12,5, CincoSaltos, (C.P. 8303) Río Negro, Argentina. 54 0299 4980005.
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