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Congress: 2008
José Dimas López Martínez1 Ricardo D. Valdez Cepeda 2 1 (JDLM) Universidad Juárez del Estado de Durango, Facultad de Agricultura y Zootecnia, División de Estudios de Postgrado, Apartado Postal 142, CP 35000. Gómez Palacio, Durango, México. e-mail; jose
Abstract Twelve percent of the 150 000 ha of irrigated land in the Comarca Lagunera es affected by different levels of salinity and sodicity. such is the case of the north of Gomez Palacio, Durango, Mexico, where this study was conducted. The objective of this experiment was to evaluate reclamation of saline soils by using different leaching levels or organic matter. Ryegrass (Lolium multiflorum Lam.) was the reference crop. This study was conducted in an area located at 18.5 km north of Gomez Palacio, Dgo., where alfalfa and cron yield range from 20 to 40% below the regional yield average. This research consisted of two independent experiments. The first consisted of the application of leaching with 0, 0.9, 1.2, and 1.5 m lamina of water, with 0 water as a control, and the second of aamendments of manure using 0, 20, 40, and 60 Mg ha-1, with 0 manure as a control. Manure as a control. Manure was incorporated to the soil at a depth of 30 cm. A complete randomized block desing with four replications was used for stattistical analysis. Ryegrass was established and manafed as recommended by BANRURAL (1979). To evaluate yield of dry matter, samles were taken whthin a circle with a diameter of 0.25 m diameter at the center of the plot. The dry matter of three sampling dates were added to obtain total yield that was used for statistical analysis. Economic analysis was performed to determine benefit-c ost ratio. Dry matter yield of leaching treatments was higher than control, but only the control had a positive positive benefit-cost ratio. All leaching tretments, using water from the the irrigation district, had higher benefit than cost. With the manure as soil amendment, both dry matter yield and benefit-cost ratio ware greater than 1 for all treatments. However, the treatment of 60 Mg ha-1 of manure resulted in the highest yield (11.0 Mg ha-1) and the highest investment recovery, even though no statistical difference for dry matter production between treatments and control was detected.
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