OCR Text |
Show comparatively thin surface soils that overlie clean fin* sand. If there were no limit to the quantity of irrigation water available, and if good farming practices were followed, including clean tillage, rotation of crops, growing of legumes on the land about one-third of the time, and plowing under of green manure crops, it is probable that much of this land would be productive for many years. However, if good farming methods are not employed, yields would become so low after a few crops had been harvested that the returns obtained, together with the oost of application of a large quantity of water, would be so meager that very little profit would be made. Fourth Class Land - Very Poorly Suited or Temporarily Not Suited to Irrigation Fourth class land includes areas that arc marginal for crop production, some of which may be utilised for crops that thrive under adverse salt and drainage conditions* Symbols on the maps indicate whether areas are mapped fourth class because of soil character, N4 S1*, topographic features, "4 V, salt or alkali content, "4 *", or drainage conditions, "AV** Rough areas, mh V, would be very expensive to level and prepare for irrigation. Where trees exist the expense of clearing would increase the reclamation cost. Areas mapped "4 A" are so highly impregnated with salts or alkali that crops will not grow. In most places where am area is mapped fourth class because of salt or alkali accumulation, •4 A", but topographic features and soil conditions are favorable, that is, where the topography is mapped "1 !¦ or "2 T", and where the soil is "1 S" or •2 S", it is recommended that the land be reclaimed. All areas for which reclamation is considered advisable have been indicated on the map by use of the symbol *RecN. On the other hand, where salt or alkali affected soil is of poor quality or would be difficult to reclaim, the symbol - 4 - |
Source |
Original book: [State of Arizona, complainant v. State of California, Palo Verde Irrigation District, Coachella Valley County Water District, Metropolitan Water District of Southern California, City of Los Angeles, California, City of San Diego, California, and County of San Diego, California, defendants, United States of America, State of Nevada, State of New Mexico, State of Utah, interveners] : |