2.2. Soil Characteristics and Irrigation As mentioned above, soil plots are composed with 75% topsoil and 25% sand. Detailed soil analysisis presented in Table 1. From these results, the land has a loamy texture with little clay and some sand.It is slightly fitted with major nutrients and organic matter: total nitrogen, available phosphorus and Water 2011, 3 1131exchangeable potash. In addition, the sands are very poor in any fertilizing element. The salinity of thetwo types of soil is very low. Otherwise the alkalinity of the sands is higher than that of the plant earth.Therefore soil cannot provoke any risk of damaging the cultures as it does not provide them with anynutriment. Therefore, the grass can only take advantage of fertilizing elements contained in waters orbrought by possible amendments. Water
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