Improvement of Water Application of Self-Propelled Sprinkler Irrigation Systems.

摘要

The number of center-pivot sprinkler irrigation systems is increasing in the central Great Plains. The reasons for this increase are their labor-saving advantages and versatility. The system's ability to irrigate rolling terrain with a wide range of application depths accounts for its versatility. The objectives of this project were to evaluate the depth and uniformity of application of a center-pivot system and to determine the depth of water stored in the crop root zone,evaporation losses and trafficability problems of a typical system during field conditions. Data were collected from a 1300foot,electrically driven system. Both size and spacing of the nozzle heads are varied to obtain desired application rates on this system. The soil type was sand and the crop was peanuts. Five systems were tested in the Oklahoma Panhandle. The systems varied in both design and lengths. Three of the systems were electrically powered and two were water driven. The average coefficient of uniformity for the five systems was 81.7. Only minor traction problems were observed in the clay loam or loam soils.