Evaluation of zinc and silicon micronutrients spraying on the agronomic, physiological and biochemical characteristic of Lallemantia iberica under rainfed and supplemental irrigation

In order to investigate the effect of zinc and silicon spraying on some of the quantitative and qualitative traits of Lallemantia iberica (Urmia Landrace), a split plot experiment based on randomized complete block design with three replications was conducted at Research Farm of Urmia University in 2016-2017. The two rainfed and supplementary irrigation systems were considered as the main plots, and the spraying of zinc, silicon and untreated control as the sub-plots. The main effects of environment, spraying and their interaction were significant on the most of the studied traits. The highest amounts of chlorophyll, carotenoids, potassium and zinc were obtained from zinc application. The highest amount of soluble carbohydrates, phosphorus, and silicon was observed in silicon spraying. There were no significant differences, in term of leaf relative water content, between Zn or Si treatments in both stress conditions. The highest percentage of seed mucilage belonged to Si spraying of rainfed plants. The highest seed oil content were occurred at Zn spraying (23.7%), and however obtained from rainfed (23.9%) plants. The amounts of grain yield of Lallemantia iberica (Urmia Landrace) either in rainfed conditions or supplemental irrigation was for zinc application (613.3 and 688.3 kg ha-1, respectively) and silicon spraying (657.3 and 668.7 kg ha-1, respectively) more than untreated control plants