ali Sheini Dashtegol; Saeed Boroomandnasab; A.Ali Naseri
Abstract
To ensure optimal operation of the drip irrigation system, it should be evaluated periodically. This research was conducted to evaluate the technical and hydraulic performance of subsurface drip irrigation system in sugar cane plantation in Sugar Cane Research and Training Institute of Khuzestan during ...
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To ensure optimal operation of the drip irrigation system, it should be evaluated periodically. This research was conducted to evaluate the technical and hydraulic performance of subsurface drip irrigation system in sugar cane plantation in Sugar Cane Research and Training Institute of Khuzestan during growing seasons of 2016-2017 and 2017-2018. For this study, four laterals were selected in experimental field (the first, one third, two third and the last laterals) and four sections including the first, one third, two thirds, and the last were determined on each laterals. Then, the volume of effluent water was measured for three minutes at any measurement point and the system parameters were calculated. Results of the evaluation of the drippers in the laboratory showed that the manufacture's coefficient variations (Cv), coefficient of uniformity (Cu), and distribution uniformity (Eu), coefficients were 15%, 90%, and 84 percent and the values of the exponent x and the k coefficient in the discharge-pressure equation were, respectively, -0.043 and 2.41. Means of Cu, Eu, coefficient of flow variations (Vqs), and Uqs during two growing seasons were 89.2%, 87.8%, 10.3%, and 89.7 percent, respectively. Based on these results, system performance was generally good. Also, by measuring pressure at different points of the system in the middle of the second growing season, the ASAE assessment indicators including: Vqs, Uqs,Vhs, and Vpf were 9%, 91%, 25%, and 13 percent, respectively. Thus, in terms of the overall performance of the drippers and uniformity of distribution the studied irrigation system was considered to be relatively good to good.
B H; S B; A N
Abstract
The water crisis and the increase in population necessitate improvement of efficiency of water use. Application of new methods of irrigation and irrigation management is a way to optimize the use of available water resources. In order to study effect of different deficit irrigation managements of potato ...
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The water crisis and the increase in population necessitate improvement of efficiency of water use. Application of new methods of irrigation and irrigation management is a way to optimize the use of available water resources. In order to study effect of different deficit irrigation managements of potato in furrow and tape drip irrigation methods on water use productivity and yield of potato, an experiment was performed at Chahar Mahal va Bakhtiari Research Farm of Agricultural and Natural Resources Research Center in 2013. The experiment was based on randomized complete blocks with split-split plot design with three replications. The furrow and tape drip irrigation methods were allocated to the main plots, while the two potato cultivars were in the sub-plots and four deficit irrigation managements including FI(100%), RDI80(80%), RDI65(65%) of available water depletion (AWD), and partial root-zone drying (PRD) during full growth period were in the secondary sub-plots. Analysis of variance showed that there were significant (P≤0.01) differences between deficit irrigation managements for tubers yield, tubers percentage of dry matter, number of tuber per plant and water productivity. Drip irrigation in comparison with furrow irrigation resulted in reduction of irrigation water amount (40%), increase in yield (10%), agronomic water productivity (43%), and economical water productivity (40%). The highest economical water productivity (73240 Rials/m3) belonged to partial root-zone drying (PRD). Due to the limitation of water resources, the best suggestion for optimizing water use is using tape irrigation and deficit irrigation management through partial root-zone drying (PRD) for producing potato.