Determination of Suitable Interval and Depth of Canola Irrigation by Class A Evaporation Pan Method in South of Khouzestan Province

Document Type : Research Paper

Authors

1 Scientific Board Member, Khouzestan Agricultural and Natural Resources Research Center

2 Retired Scientific Board Members of Khouzestan Agricultural Research Center

3 Soil and Water Research Institute, respectively.

Abstract

Canola is one of the oilseed crops, which is grown extensively in Khouzestan Province. As a newly adapted crop, there is not so much information about its water requirement. Its study is the first step in the determination of canola irrigation scheduling and water consumption. An experiment was based on a randomized complete block design with four treatments and three replications. It was carried out from 1379 to 1381 on the Shavoor Agriculture Research Station in Khouzestan province. The station characteristic is: elevation is 32 m from sea level, physiography unit is Alluvial Plain, soil taxonomy is fine mixed hyperthermic Aeric Haplaquepts, topsoil and subsoil textures are silty clay loam and silty clay, respectively. Soil salinity is 2-3 dS/m in topsoil    (0-30 cm), pH and %OC are 7.6 and %0.8, respectively. The treatments were: 1) Irrigation interval based on 50 mm cumulative evaporation from class A Evaporation Pan (C.A.E.P) (I1). 2) Irrigation interval based on 75 mm cumulative evaporation from C.A.E.P (I2). 3) Irrigation interval based on 100 mm cumulative evaporation from C.A.E.P (I3). 4) Irrigation interval based on 125 mm cumulative evaporation from C.A.E.P (I4). Water use consumption during experiment will also present irrigation depth. Tilling operation, fertilizer and herbicide, applications planting and harvesting were carried out according to previous technical experiences. The day before irrigation, soil samples were taken to measure moisture content. Depth of irrigation water was calculated by parameters such as soil moisture content (θ), soil moisture content in field capacity (θfc), soil bulk density (ρ) and effective root depth (D). A pump was used for delivering irrigations water and water volume was measured by a flow meter. Grain yield, oil percent and oil yield were also determined. Analysis of variance and means comparison tests were done by Duncan method. So, results are as follows, the best interval of canola irrigation is 75 mm cumulative evaporation from C.A.E.P. Water use consumption of canola is about 350 to 400 mm for 1.5-2 ton/ ha yields.

Keywords

References

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Iranian Journal of Soil Research
Volume 20, Issue 1
May 2006
Pages 157-163

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