Evaluación del funcionamiento hidráulico del drenaje soterrado en áreas arroceras
Julián Herrera-Puebla; Román Pujol-Ortiz; Gilberto J. López-Canteñs; Greco Cid-Lazo; Roberto Alarcón-Licea; Eduardo Espinosa
Available online: 2010-12-06 /pág.103 -108
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In the North area of Granma, a Cuban province, the salinity of the soils is an obstacle for the attainment of high yields in the rice. This area is characterized by the scarce precipitation, the shallow phreatic levels (1.5-2.5 m) and strongly mineralized (4.5 g•L-1), that makes indispensable the drainage for the control of the soil salinity. In order to obtain references to introduce the subsurface drainage in these areas, it was carry out during three years, in a pilot lot of 6.5 ha, an experiment with drains spaced at 30 and 100 m in trenches of 1.3 m-depth with filler of shell of rice in the bottom. During the rain season the drains spaced at 30 and 100 m evacuated the 11.2 and 6.0 % of the precipitation, respectively; however, when the phreatic level stayed below the drain, the discharge was almost constant and take values of 0.05 mm•day-1 in the drain of 30 m and of 0.014 in that of 100 m. With the irrigation, the discharges of the drains were similar in both distances and they reached values averages of 1.63 mm•day-1. Under conditions of non-permanent regime, that coincides with the period of no irrigation, the validity of the equation of Glover-Dumm was demonstrated, and the medium value of K obtained from this evaluation ranged between 0.2-0.5 m•day-1. Both spacing were efficiently allow the wash out of the soil salts and to impede that in the fallow time the saline tenors in the soils increased. As the same time, they diminishes the soil salinity from of 11.5 dS•m-1 up to 3 dS•m-1.
Keyworks: Cuba, rice, soil salinity, subsurface drainage.
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Herrera-Puebla, J., Pujol-Ortiz, R., López-Canteñs, G. J., Cid-Lazo, G., Alarcón-Licea, R., & Espinosa, E. (2009). Hydraulic evaluation of subsurface drainage in rice fields. , 1(2), 103 -108. http://dx.doi.org/10.5154/r.inagbi.2009.08.017