Fiva - Research School of Water Resources

Back to list

Name:	Seyed Hamid Ahmadi
Project title:	Agronomic and physiological studies of partial root-zone drying and deficit irrigation on potato in different soil textures
Enrolled at:	University of Copenhagen, Department of Basic Sciences and Environment
Start and end date:	2006 - 2009
Address:	Department of Irrigation, Shiraz University, Shiraz , Iran
Phone:	0098 711 2286130
Email:	seyedhamid.ahmadi@gmail.com
Website:
Advisor(s):	Søren Hansen
Source of funding:	University of Copenhagen, University of Aarhus, FIVA
International collaboration:

Description of research:

Due to limitation of fresh water resources for agricultural use in the arid to semi arid regions in the world in the future , scientists are investigating to apply irrigation methods to use less water but get more yield, i.e., less drop but more grain. One of the newly advanced irrigation methods is Partial Root zone Drying (PRD) which is an improved deficit irrigation that has been shown to be efficient in alleviating water use efficiency. Several researches have proven that, there would be no significant difference between the yield obtained with this irrigation method and full irrigation.
Up until now, most studies have been focused on the interaction of this irrigation method and physiological parameters of the plant, however, in this study we are going to investigate the interaction of this method with both under- and above ground plant cover. Attention will be paid to root water uptake and soil water movement, root development and plant physiological responses to different irrigation strategies. Modelling is a part of the research to simulate the soil physical and crop physiological processes, as well. Developing new models on the gas exchange of potatoes is a State of the Art in this study.

Publications:

INTERNATIONAL JOURNALS:

Sepaskhah, A.R, Ahmadi, S.H., and Nikbakht Shahbazi, A.R. (2005). Geostatistical analysis of sorptivity under tilled and no-tilled contions. Soil & Tillage Research, 83: 237-245.

Amin, S. and Ahmadi, S.H. (2006). Incorporating rock fragments in soil erosion models: a case study, the ANSWERS model. Iranian journal of Science and Technology, 30 (B4): 527-539.

Ahmadi, S.H., Amin, S., Keshavarzi, A.R., and Mirzamostafa, N. (2006). Simulating watershed outlet sediment concentration using the ANSWERS model by applying two sediment transport capacity equations. Biosystems engineering, 94: 615-626.

Ahmadi, S.H., and Niazi Ardekani, J. (2006). The effect of water salinity on growth and physiological stages of eight canola (Brassica napus) cultivars. Irrigation Science, 25: 11-20.

Ahmadi, S.H., and Sedghamiz, A. (2007). Geostatistical analysis of spatial and temporal variataions of groundwater level. Environmental Monitoring and Assessment, 129: 277-294.

Ahmadi, S.H., and Sedghamiz, A. (2008). Application and evaluation of kriging and cokriging methods on groundwater depth mapping. Environmental Monitoring and Assessment, 138: 357-368.

Shahnazari, A., Ahmadi, S.H., Lærke, P.E., Liu, F., Plauborg, F., Jacobsen, S.E., Jensen, C.R., Andersen, M.N. (2008). Nitrogen dynamics in the soil-plant system under deficit and partial root-zone drying irrigation strategies in potatoes. Europian Journal of Agronomy, 28:65-73.

Ahmadi, S.H. and Fooladmand, H.R. (2008). Spatially distributed monthly reference evapotranspiration derived from the calibration of Thornthwaite equation: a case study, south of Iran. Irrigation science, 26:303-312.

Fooladmand, H.R., and Ahmadi, S.H. (2009). Monthly spatial calibration of Blaney-Criddle equation for calculating monthly ETo in south of Iran. Irrigation and Drainage, 58:234-245

Ahmadi, S.H., Andersen M.N., Poulsen R.T., Plauborg F., Hansen S. (2009) A Quantitative Approach to Developing More Mechanistic Gas Exchange Models for Field Grown Potato: A New Insight into Chemical and Hydraulic Signalling. Agricultural and Forest Meteorology, 149: 1541-1551

Ahmadi S.H., Andersen M.N., Plauborg F., Poulsen R.T., Jensen C.R., Sepaskhah A.R., Hansen S. (2009) Effects of Irrigation Strategies and Soils on Field Grown Potatoes: Gas exchange and xylem [ABA]. Agricultural Water Management 97: 1486-1494

Ahmadi S.H., Andersen M.N., Plauborg F., Poulsen R.T., Jensen C.R., Sepaskhah A.R., Hansen S. (2010) Effects of irrigation strategies and soils on field grown potatoes: Yield and water productivity. Agricultural Water Management 97: 1923-1930

Sepaskhah A.R. Ahmadi S.H. (2010) A review on partial root-zone drying irrigation. International Journal of Plant Production (Accepted)

Rahimi-Adregani A., Sepaskhah A.R., Ahmadi S.H. (2010) Evaluation of different methods for prediction of saturated hydraulic conductivity of tilled and untilled soils. Archives of Agronomy and Soil Science, (Accepted)

INTERNATIONAL CONFERENCES:

Ahmadi, S.H., Andersen M.N., Poulsen R.T., Plauborg F. (2008). New Insight into Plant Gas Exchange Models including Chemical and Hydraulic Signalling. X European congress for Agronomy, 15-19 September, Bologna, Italy, Pages 843-844.

Ahmadi, S.H., Andersen M.N., Plauborg F. (2008). Potato Root Growth and Distribution under Three Soil Types and Full, Deficit and Partial Root Zone Drying Irrigations. X European congress for Agronomy, 15-19 September, Bologna, Italy, Pages 631-632.

Andersen, M.N., Lærke P.E., Ahmadi S.H., Shahnazari A., Plauborg F., Liu F., Jensen C.R. (2008). Partial root-zone drying increases water use efficiency and marketable yield of potato. X European congress for Agronomy, 15-19 September, Bologna, Italy, Pages 635-636.

Shahnazari, A., Aghajani Mazandarni Gh., Ahmadi S.H., Liu F., Jensen C.R, Andersen M.N. (2008) Nitrogen dynamics under partial root-zone drying irrigation strategies in potatoes. X European congress for Agronomy, 15-19 September, Bologna, Italy, Pages 711-712.