Effect of subsurface drainage system on water percolation in paddy fields during rice cropping season

Nozari, S. (2013) Effect of subsurface drainage system on water percolation in paddy fields during rice cropping season. Masters thesis, University of Zabol.

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Due to the very high water consumption in paddy fields, the need for careful consideration of how to provide and manage water in these lands is importance. One of the components of the water balance in paddy fields that is important in terms of water use is water deep percolation. Much of the percolation is estimated more accurately, so it is better to determine the crop water requirement, irrigation, drainage systems design and related facilities in order to reduce water losses. In our country the subsurface drainage system in the paddy fields is in the early stages of their design, yet a comprehensive study of the changing parameters of the water balance in paddy fields has not been done with these systems. This study examines the impact of subsurface drainage at 30 and 15 meters length and 0.9 and 0.65 meters depth and mid-season drainage on water deep percolation rate during the rice growing season by using an open bottom and bottom Lysimeters method. The results showed that the bi-level drain with 163.8 mm has maximum effect and surface drainage with 120.5 mm has the lowest effect on the deep percolation rate. The results showed that by reducing the distance and increasing the depth of the drains the water deep percolation was increased. Mid-season drainage also had a positive effect on water percolation so that after this period, in all the treatments amount of water percolation was increased. The bi-level drain treatment with an average depth of 0.60 mm has maximum and surface drainage treatment with 0.37 mm has the lowest water deep percolation.

Item Type: Thesis (Masters)
Uncontrolled Keywords: subsurface drainage, water deep percolation, paddy fields, midseason drainage
Subjects: S Agriculture > S Agriculture (General)
T Technology > TC Hydraulic engineering. Ocean engineering
Depositing User: admin admin1 admin2
Date Deposited: 14 May 2016 09:09
Last Modified: 14 May 2016 09:09
URI: http://eprints.uoz.ac.ir/id/eprint/586

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