| The decrease of the production of corn (Zea mays L.) is studied in this work, in two different situations: saline soil and saline soil with gypsum.;The study has been developed in two areas in Southern Navarra (Spain): Cabanillas, with soils classified as Acuic Xerfoluvents, and Ribaforada, with soils classified as Cambic Gypsiorthid and Torriarents. A complete characterization of these soils has been made, including the study of the sand fraction, mineralogical studies using X-ray diffraction, and the study of their micromorphology.;The work has been developed on six experimental plots and a total amount of 120 trial plots, from which corn production and soil data have been obtained. Soil samples were collected at three depths: 0--30, 30--60 and 60--90 cm.;Moreover, an electromagnetic induction method for salinity measurements has been used.;Among the obtained results, the difference between the threshold value of salinity that corn shows in the two different situations comes out. In a saline soil, it is close to 1,88 dS/m, and in a saline soil with gypsum, it is close to 4 dS/m. The production decreasing standard is situated between 9.77% and 16.19%. Due to all this, the implementation of differences between the two salinity situations (with and without gypsum) in Land Evaluation for Irrigation studies is recommended. Furthermore, the good behaviour of the electromagnetic induction method for salinity measuring is also confirmed. |
