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Your search keyword '"Dahri, Saeed Ahmed"' showing total 3 results
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3 results on '"Dahri, Saeed Ahmed"'

2. Comparative study of irrigation advance based infiltration methods for furrow irrigated soils

Author

Shaikh, Irfan Ahmed, Wayayok, Aimrun, Mangrio, Munir Ahmed, Khatri, Kanya Lal, Soomro, Ashifa, Dahri, Saeed Ahmed, Shaikh, Irfan Ahmed, Wayayok, Aimrun, Mangrio, Munir Ahmed, Khatri, Kanya Lal, Soomro, Ashifa, and Dahri, Saeed Ahmed

Abstract

This study was attempted to evaluate infiltration methods based on irrigation advance for furrow irrigation. Irrigation advance data were collected at Latif farm, Sindh Agriculture University, Tandojam for three irrigation events. To achieve the objectives of the study two different methods viz. Upadhyaya and Raghuwanshi and Valiantzas one-point, were tested against the two-point method. Evaluation of employed methods was undertaken to know the best method for the prediction of cumulative infiltration and advance. The results revealed that Upadhyaya and Raghuwanshi (ME=-5.25) and Valiantzas one-point (ME=-0.99) are unsuitable for silt loam soil with their original constants as these methods show great scatter when compared with reference method and measured data. Thus, it is suggested that these methods must be evaluated before use.

Published
2017

3. Assessing evapotranspiration rate and sesame (Sesamum indicum) crop water use under different water table depths.

Author

Dahri, Shahzad Hussain, Mangrio, Munir Ahmed, Mirjat, Muhammad Saffar, Dahri, Saeed Ahmed, Aqlani, Zaheer Ahmed, Jakhrani, Jazib Hussain, and Aghani, Ghulam Mehdi

Subjects
*SESAME, *WATER depth, *WATER use, *WATERLOGGING (Soils), *EXPERIMENTAL agriculture, *EVAPOTRANSPIRATION, *WATER table
Abstract

This study was conducted to estimate the evapotranspiration and to probe the seasonal groundwater contribution in total crop water use by the sesame crop under different water table depths. The method of combining lysimeter was executed to investigate the groundwater contribution in total water used by the crop. The water table depths were maintained at 1.60, 2.0 and 2.40 m, respectively. Each water table depth was replicated for three times. Climate conditions under which crop was grown were monitored and all the water balance components were recorded accordingly. The obtained evapotranspiration (ET) from lysimeter experiment was compared with the predicted ET by CROPWAT model. The experimentally observed ET were 457.5, 452 and 428 mm under the water table depths of 1.60, 2.0 and 2.40 m, respectively. The predicted ET using CROPWAT model was 434 mm, which was very close to the observed values. Under the lysimeter experiment, the groundwater contribution in total crop water use was observed as 37%. The predicted crop coefficient was ranged from 0.38 to 0.98, whereas the experimental crop coefficient was 1.0. The trend of soil moisture balance predicted by the model revealed the same as that experimentally observed. Thus, the use of CROPWAT model is recommended to redesign irrigation amounts and to prevent soil salinity and waterlogging problems. [ABSTRACT FROM AUTHOR]

Published
2021

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