Volume 22, Issue 5 (2020)
JAST 2020, 22(5): 1295-1311 |
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Barati V, Bijanzadeh E, Zinati Z. Nitrogen Source and Deficit Irrigation Influence on Yield and Nitrogen Translocation of Triticale in an Arid Mediterranean Agroecosystem. JAST 2020; 22 (5) :1295-1311
URL: http://jast.modares.ac.ir/article-23-31916-en.html
URL: http://jast.modares.ac.ir/article-23-31916-en.html
1- Department of Agro-ecology, College of Agriculture and Natural Resources of Darab, Shiraz University, Islamic Republic of Iran. , v.barati@shirazu.ac.ir
2- Department of Agro-ecology, College of Agriculture and Natural Resources of Darab, Shiraz University, Islamic Republic of Iran.
2- Department of Agro-ecology, College of Agriculture and Natural Resources of Darab, Shiraz University, Islamic Republic of Iran.
Abstract: (1571 Views)
To identify the important features of triticale that contribute to improving grain and biomass Water Use Efficiency (WUEg and WUEb, respectively), grain yield, and Nitrogen (N) remobilization, a 2-year side-by-side experiment was carried out on triticale with different nitrogen sources and water regimes, in a typical Mediterranean environment of Iran. There were two levels of water regimes: Normal Irrigation (IRN) and irrigation cut off after anthesis stage (IRMD). Rain-fed treatment (IR0) was included in the second year. Four N sources including Azospirillum brasilense (Bio), Azospirillum brasilense+75 kg N ha-1 as urea (Bio+N75), 150 kg N ha-1 as urea (N150), and control unfertilized (N0) plots were used. This study showed that the highest grain yield (6,258 kg ha-1) was achieved by chemical N fertilizer application (N150) under IRN. In contrast, the application of Bio+N75 resulted in the highest grain yield as compared with the other N sources under IRMD (4,409 kg ha-1) and IR0 (2,960 kg ha-1) conditions. Water stress significantly increased WUEb at all N sources. However, WUEg slightly increased by IRMD and then sharply decreased by IR0 in all N sources, except N150 plots, where WUEg drastically decreased by water stress imposed by IRMD and IR0. The Bio+N75 treatment had the highest N remobilization. Although N remobilization was not affected by IRMD in dryer year, it increased by IRMD (8.4%) in the relatively wet year. Totally, for a more sustainable farming system in arid Mediterranean conditions, integration of biofertilizer and chemical N fertilizer could be successfully used for increasing grain yield, WUE, and N remobilization of triticale, especially under deficit irrigation regimes.
Article Type: Original Research |
Subject:
Crop Ecology
Received: 2019/04/12 | Accepted: 2019/11/13 | Published: 2020/09/2
Received: 2019/04/12 | Accepted: 2019/11/13 | Published: 2020/09/2
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