الفهرس | Only 14 pages are availabe for public view |
Abstract This investigation was carried out in order to: 1 1. Compare between different fertigation methods with plat- in nd and plat- on line emitters under 0.5-1.5bar operating pressures 2. Find out the best fertigation device with plat- in and plat -on line emitters and different lateral lengths in drip irrigation system ; and 3. Finally chose the best device for applied fertilizers and chemicals under certain operating condition. Drip irrigation system including fertigation units represents in this research. The effect of fertigation devices under different lateral lengths on the distribution uniformity of water and fertilization were evaluated, in order to clarify the best fertigation devices and lateral lengths in the experimental farm. The results exhibit that distribution uniformity DU using the hydraulic injection pump were 90 , 99 and 97% for lateral lengths of 20,40 and 60m respectively. However, DU,s using the venture device were 97, 92 and 99% for the same lateral lengths. However, using Pressure differential tank DU,s were 97, 98 and 99% for the same lateral lengths. And using Electrical centrifugal pump DU,s were 97 , 96 and 100 % for the same lateral lengths. The results of distribution uniformity of (F.D.U) with using the hydraulic injection pump were 96 , 98 and 99%for lateral lengths of 20 , 40 and 60m respectively. The F.D.U with using Electrical centrifugal pump were 97, 98 and 96 % lateral for lengths of 20,40 and 60m respectively , and the (F.D.U) with the venturi were 99 , 75 and 88% and with using Pressure differential tank were 86 , 88 and 96% for the lateral lengths of 20 , 40 and 60m respectively. |