Document Type : Research Paper

Authors

1 M.Sc. Student, Agroecology Department. Faculty of Agriculture and Natural Resources of Darab, Shiraz University, Darab, Iran.

2 Assistant Professor, Agroecology Department, Faculty of Agriculture and Natural Resources of Darab, Shiraz University, Darab, Iran.

3 Associate Professor, Soil Science Department, Faculty of Agriculture and Natural Resources of Darab, Shiraz University, Darab , Iran.

4 Associate Professor, Agroecology Department, Faculty of Agriculture and Natural Resources of Darab, Shiraz University, Darab, Iran.

Abstract

This study has been performed at the experimental farm of the College of Agriculture and Natural Resources of Darab, Shiraz University during 2017-2018 growing season. A split factorial experiment in a randomized complete block design with three replicates is carried out. The treatments include two levels of irrigation as the main plots [normal irrigation (IRN): irrigation based on the plant's water requirement up to the physiological maturity and water stress (IRDI): irrigation based on the plant's water requirement up to the anthesis stage]. Also, the first sub plot has been two levels of wheat residues [1. no residue (NR), 2. returning 30% of wheat residue to soil (RR)] and the second sub plot four fertilizer sources [N0, without fertilizer (control); N100, 100 kg N ha-1; Bio + N50, Biofertilizer (Azospirillum brasilense) + 50 kg N ha-1 and Bio, Biofertilizer (Azospirillum brasilense)]. The results show that copper, zinc, and iron contents are affected by N source × crop residue × IR regime interaction. The interaction show that the barley grain micronutrient contents have had a decreasing trend from IRN to IRDI treatment. Also, N fertilizer sources increase the micronutrient contents in both irrigation regimes, especially, in IRN conditions. The Bio + N50 treatment has increased the copper grain content by 74% and 72% as compared to N0 in NR and RR treatments, respectively, under IRN conditions. Also, there is a similar trend under IRDI conditions. Furthermore, the other grain micronutrient contents show a similar trend with barley grain copper content when affected by N source × crop residue × IR regime interaction. The highest grain yield belongs to Bio + N50 treatment under IRN (4049 kg ha-1) and IRDI (2256 kg ha-1) conditions. Therefore, due to the superiority of Bio + N50 in micronutrient contents, grain yield under different irrigation regimes and residues treatments, the principles of sustainable agriculture and environmental considerations, application of Bio + N50 treatment is recommended in southern regions of Iran.

Keywords

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