Effect of supplemental irrigation on water requirement satisfaction index of rainfed wheat in the Tabriz plain semi-arid climate

Document Type : Original Article

Authors

1 UNIVERSITY OF TABRIZ

2 Associate Professor of Water Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.

Abstract

Fluctuations of climatic factors play an important role in the agricultural productions, especially in rainfed conditions. Wheat is one of the most important strategic products in the world, which is particular importance in supplying human food. In rainfed wheat farming, rain is one of the main elements that is considered the only source of moisture. In this study meteorological data of Tabriz synoptic station and rainfed wheat yield have been used in 25 years statistical period. First, according to growing degree day (GDD) index, the period of wheat growth in the region was determined then, by calculating the water requirement satisfaction index, the climate risk of rainfed wheat production was investigated. Results showed in comparison to the rainfall, water requirement satisfaction index has a higher correlation with wheat yield. Mentioned finding indicated seasonal distribution of precipitation has significant effect on yield fluctuations due to different evapotranspiration rate at each stage of growing season. Based on gained results in the study area climate risk is high in the end of rainfed wheat growing season. So, in order to study the effects of water stress in end of growing season, a field experiment including two levels of supplemental irrigation (rainfed and one irrigation at stage of high climate risk) was conducted in three replications at Research Fields of Agriculture Faculty, Tabriz University. Results showed that one supplemental irrigation in the grain filling stage and before the occurrence of water stress increased yield significantly. Also, after one supplemental irrigation increasing 12.5% water requirement satisfaction index led to increase of 2170 kg.ha-1 in wheat yield.

Keywords

References

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Iranian Journal of Irrigation & Drainage
Volume 11, Issue 6 - Serial Number 66
March and April 2018
Pages 1143-1151

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