The Effect of Depth and Space Subsurface Drainage on Paddy Field Drainage Intensity (Case Study: Fields of Rice Research Institute of Iran)

Document Type : Complete scientific research article

Authors

1 phd student/ university of zabol

2 Associate Professor/University of Zabol

3 Assistant Professor /Rice Research Institute of Iran (RASHT)

4 Professor, Department of Irrigation, Natural Resources and Agriculture College, University of Tehran (Karaj)

5 Associate Professor/ university of zabol

Abstract

Background and objectives: Due to limited resources, soil and fertile land, the need for maximum use of the potential of climate, Create favorable conditions for a variety of land use in the annual crop and most important of all completed equipping and modernization plans and land And scoring costs out, we can create a subsurface drainage, provides the possibility of planting crops other than rice in the wet season, in addition to creating more favorable conditions for planting and harvesting rice. In this research, the effect of depth and space subsurface drainage systems on drainage intensity was investigated in three stages (mid-season drainage, drainage in time rice harvest and drainage during second planting season).
Materials and Methods: Data needed for the study was obtained from paddy fields Rice Research Institute in the city of Rasht in an area of one hectare in crop year. Drainage treatments included: six conventional subsurface drainage systems with rice husk envelope including drainage system with drain depth of 0.8 m and drain spacing of 7.5 m (L7.5 D0.8), drain depth of 0.8 m and drain spacing of 10 m (L10 D0.8), and drain depth of 0.8 m and drain spacing of 15 m (L15 D0.8), drain depth of 1 m and drain spacing of 7.5 m (L7.5 D1), drain depth of 1 m and drain spacing of 10 m (L10 D1), and drain depth of 1 m and drain spacing of 15 m (L15 D1). All lines are 40 meters long and made of PVC corrugated pipes with a diameter of 125 mm. Rice husk was used as a covering around the pipe drain.
Results: The difference between treatments L7.5D0.8 and L10D0.8 before tillage (there are more leaks and cracks) was not statistically significant, The difference between treatments was significant L7.5D0.8 and L15D0.8 at 5%. The difference between treatments L7.5D0.8 and L7.5D1 by 1% and the difference between treatments in the L10D0.8 and L15D0.8 by 1% level has been significant. In other words, the drain-distance 7.5 meters and a depth of 1 meter was increased discharge rate compared to 0.8 meters depth. The results showed that the difference between the treatment L7.5D0.8 with L15D0.8, L10D0.8 and L7.5D1 was significant 1% statistical level. Also in mid season drainage, spacing 7.5 m and a depth of 1 meter subsurface drainage almost 4 times the intensity of drainage compared to spacing 7.5 m and a depth of 0.8 m subsurface drainage. Most of the time difference between treatments in the drainage in order crop second in the state of cracks is in the peak of the hydrograph.
Conclusion: Cracks created at the time mid season and end season drainage at the time of rice cultivation a critical role has subsurface drainage and drainage parameters such as intensity during the second crop.

Keywords

References

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Journal of Water and Soil Conservation
Volume 23, Issue 4
October 2016
Pages 219-233

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