Abstract
Scarcity of rainfall and limited irrigation water resources is the main challenge for agricultural expanding policies and strategies. At the same time, there is a high concern to increase the area of wheat cultivation in order to meet the increasing local consumption. The big challenge is to incerese wheat production using same or less amount of irrigation water. In this trend, the study was carried out to analyze the sensitivity of wheat yield to water deficit using remotely sensed data in El-Salhia agricultural project which located in the eastern part of Nile delta. Normalized Difference Vegetation Index (NDVI) and Land Surface Temperature (LST) were extracted from Landsat 7. Water Deficit Index (WDI) used both LST minus air temperature (Tair) and vegetation index to estimate the relative water status. Yield response factor (ky) was derived from relationship between relative yield decrease and relative evapotranspiration deficit. The relative Evapotranspiration deficit was replaced by WDI. Linear regression was found between predicted wheat yield and actual wheat yield with 0.2?6, 0.025, 0.252 and 0.76 as correlation coefficient on 30th of Dec. 2012, 15th of Jan. 2013, 16th of Feb. 2013 and 20th of Mar. 2013 respectively. The main objective of this study is using a combination between FAO 33 paper approach and remote sensing techniques to estimate wheat yield response to water.
Highlights
About 21% of the world’s food depends on the wheat crop, which grows on 200 million hectares of farmland worldwide
Water Deficit Index (WDI) is a function of ETa to potential evapotranspiration (PET) ratio [28]
WDI has been developed for the reference crop as a generic index for quantifying crop water stress for various crops
Summary
About 21% of the world’s food depends on the wheat crop, which grows on 200 million hectares of farmland worldwide. Most of developing countries including Egypt are wheat importers. About 81% of wheat in the developing world is produced and utilized within the same country, if not the same community [1]. With a rapidly growing world population, the pressure on limited fresh water resources increases. How to cite this paper: El-Shirbeny, M.A., Ali, A.M., Rashash, A. and Badr, M.A. (2015) Wheat Yield Response to Water Deficit under Central Pivot Irrigation System Using Remote Sensing Techniques. World Journal of Engineering and Technology, 3, 65-72.
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