Iranian Journal of Field Crop Science

Iranian Journal of Field Crop Science

Effects of supplemental irrigation time and nitrogen rates on yield and agronomic characteristics of dryland wheat (Triticum aestivum L.) Kohdasht variety

Document Type : Research Paper

Authors
Nosratollah Heidarpour 1
Sajad Talaee 2
1 Research lecturer of Kohgiluyeh and Boyerahmad Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Yasouj, Iran
2 Ph.D. Student in Biometry, Plant Breeding and Biotechnology Department, Faculty of Agriculture, Sari Agriculture and Natural Resource University, Sari, Iran
10.22059/ijfcs.2017.129733.653920
Abstract
This study carried out to investigate the effect of supplemental irrigation and nitrogen application times on seed yield and agronomic characteristics of dryland wheat (Triticum aestivum L.) Kohdasht variety in Gachsaran dryland agricultural research station. For this purpose, the irrigation times in main plots (Rainfed, Planting, Flowering, Planting + Flowering with rates of 50mm) and different nitrogen rates (0, 30, 60, 90 and 120 kg.h-1) in sub plots were studied based on RCBD split plot design for three consecutive years, during 2009-12 seasons. According to the results, the relationship between the amount of applied nitrogen and seed yield following the quadratic regression equation and average requirement of nitrogen for Kohdasht variety wheat was determined 80 kg.h-1 to achieve 95 percent of maximum seed yield. This value change of nitrogen, could explain 86 percent of variation in grain yield (R2=0.86). Also among supplemental irrigation treatments, the amount of 50 mm irrigation at wheat flowering stage compared to rainfed (non-irrigated), increased grain yield by 43 percent. Finally, according to the findings of this study, it is necessarily recommended to apply 80 kg.h-1 nitrogen in combination with supplemental irrigation at wheat flowering stage, to improve and increase yield.
Keywords
fertilization
Gachsaran region
moisture deficit
Optimal level
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Iranian Journal of Field Crop Science
Volume 47, Issue 4 - Serial Number 4
Winter 2017
Pages 541-549

  • Receive Date 12 August 2015
  • Revise Date 07 February 2016
  • Accept Date 09 February 2016
  • Publish Date 19 February 2017