versión On-line ISSN 1850-468X
In this paper we analyzed the sequences of days without precipitation for the period between the years 1961 and 2000 for 12 stations located in the area of agriculture in Argentina. We define the term dry sequence n days as a succession of n days without precipitation preceded and followed by days with precipitation greater than 0 and 2 millimeters. In this paper we focus on the study of some characteristics of dry sequences. The average length of the dry sequence (2 mm) is located between 7 or 8 days, while the maximum length has a variation between 70 (east area) and 140 days (west area). The specific analysis of the longest sequences of each year shows the spatial and temporal coherence that exists between them; we can detect years with water's deficits. It discusses in particular three periods of two-months (october - november, november - december, december - january), which include the important stages for the main crops (wheat, corn and soybeans, respectively), where the lack of water can affect crop production. In each period the largest dry sequences reach an average of 25 to 35 days, with an average sequence close to 7 days.
Palabras llave : Dry sequence; Two-month; Variability.