Document Type : Research Paper

Authors

1 Former Ph.D. Student, Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran.

2 Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, Tehran 1411713116, Iran.

3 Professor of Seed and Plant Improvement Institute (SPII), Agricultural Research, Education and Extension Organization(AREEO), Karaj, Iran

4 Assistant Professor, Genetics and Agricultural Biotechnology Institute of Tabarestan and Sari Agricultural Sciences and Natural Resources University, Sari, Iran

5 Former Ph.D. Student, Department of Agronomy, Faculty of Agriculture, Shahrood University of Technology, Iran.

6 Assistant Professor, Department of Agricultural Sciences, Sari. Payame Noor University,Iran.

7 Preceptor, Faculty of Department of Agriculture science, Payamenoor University. Sari. Iran.

Abstract

In order to study the effects of late-season drought stress and foliar application of zinc sulfate (ZnSO4) and manganese sulfate (MnSO4) on physiological characteristics and yield of rapeseed cultivars, a factorial split-plot test was conducted in a randomized complete blocks design for two cultivation years (2017-2019) in Karaj, Iran. Experimental treatments were included two levels of irrigation (full irrigation (control) and withholding irrigation from flowering stage) and four levels of foliar application (control, ZnSO4, and MnSO4, separately, and combined application of them) as factorial in the main plots, and rapeseed genotypes (Nima, Niloofar and KS7) were considered as subplots. Combined foliar application of zinc and manganese sulfate under full irrigation conditions increased the content of seed oil and soluble carbohydrates by 3% and 11%, respectively, compared to the control. On the other hand, in the conditions of withholding irrigation from flowering stage increased the percentage of seed oil and leaf proline content compared to the control by 9% and 5.2%, respectively. Niloofar genotype had the highest seed yield (5261 kg/ha) under full irrigation conditions, which was 9% and 11.8% higher than KS7 and Nima genotypes, respectively. Nima genotype with 3371 kg/ha had the highest yield in the conditions of withholding irrigation. In general, in both irrigation treatments, simultaneous foliar application of zinc sulfate and manganese had the greatest effect on the physiological traits of the studied genotypes, so that in full irrigation of Niloofar genotype and in case of interruption of irrigation of Nima genotype is recommended.

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