In order to investigate the effect of nano iron chelate and compare to EDDHSA chelate on saffron, a factorial experiment with six treatments and three replications was conducted in saffron research farm of Shahed University in crop year of 2013-2014. Treatments included iron fertilizer at two levels of application of nano iron chelate fertilizer and iron chelate fertilizer with base of EDDHSA and the second agent was amount of fertilizer at three levels of 0,5 and 10 kg haG 1 . Number of flowers, flowers performance, yield of wet and dry stigmas, amount of chlorophyll a and b, total chlorophyll, leaf area index, yield of dry leaf, concentration of leaf iron and total iron were investigated in this study. Qualitative features of Saffron including secondary metabolites of crocin (color agent), picrocrocin (taste agent) and safranal (scent) were measured. The results showed that all traits under study except picrocrocin, safranal, crocin, chlorophyll b, total chlorophyll and leaf area were affected by type, amount or interaction of type in amount of fertilizer. With increase of iron nano fertilizer content by 10 kg of flower number and yield of wet flower increased compared to the control. But application of 5 kg nano chelate led to increased yield of dry stigma, yield of dry leaf, concentration of leaf iron and total iron, compared to control. The overall results showed that a nano-based iron fertilizer is more effective than micro and 5 kg application of this fertilizer is superior to 10 kg.

In order to study the effect of planting dates and different irrigation regimes on yield and yield components of six canola cultivars, an experiment was conducted in two growing seasons; 2008 to 2009 and 2009 to 2010. Six canola cultivars (Zarfam, GKH1103, GKH1605, GKH2005, GKH305 and GKH3705) were cultivated in two different dates (October 7th and November 6th) with two levels of irrigation regimes (irrigation after 60 mm evaporation from Class A evaporation pan and irrigation interrupting at flowering stage). The experiments were conducted in randomized complete block design arrangement in split factorial with four replications. The results demonstrated that late planting date and interrupting of irrigation at flowering stage significantly decreased growth, yield and yield components the of canola cultivars. In addition, oil yield was affected by late planting and water stress and it was dramatically decreased. Also, there was no significant difference among the cultivars with respect to oil percentage. The highest seed yield (5930.4 kg. ha-1) was obtained from GKH1103 cultivars planted on October 7th under the conditions of full irrigation. Seed yield and oil yield in the second year was more than that of the first year; this increase was related to the increase in seed weight and pod number per plant but not to number of seed per pod. In general, canola cultivation on November 6th considerably decreased seed and oil yield and it is an important point to achieve desirable yield to seed sowing not done later than October 7th. Additionally, complementary irrigation was very important to gain high yield in canola under the conditions of this study.

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In order to investigate the effect of seed sowing date and humic acid foliar application on some agronomic traits of bread wheat an experiment was conducted in Islamshahr, Iran during 2013 growing season. The experimental design was a complete randomized block design arranged in factorial with three replications. The first factor was included two sowing date (middle of November and middle of December) and the second factor was included three humic acid levels (0, 4 and 8 liter ha -1 ). The results indicated that late seed sowing lead to significant reduction in agronomic traits such as tiller number, spike number, seed number and seed weight. In addition, vegetative growth was affected by late seed sowing and so that shorter plants were observed. Number of days until spike emergence, number of days until pollination and number of days until physiological maturity decreased due to late seed sowing. By contrast, humic acid application increased plant growth and improved yield and yield components through extending growing period.

In order to study the effect of nano-iron and manganese fertilizer, a field experiment was conducted at 2013-2014 growing season at the Research Farm in Faculty of Agriculture, Tarbiat Modarres University, Tehran, Iran. Experiment was conducted as a randomized complete block design arrangement in split plot with three replications. Three irrigation regimes (without water deficit stress, water deficit stress at vegetative stage and water deficit stress at reproductive stage) were randomized to the main plots and combinations of foliar nano-iron and nano-manganese application as were randomized to the sub plots. Statistical analysis showed that irrigation and spraying regimes and their interactions had significant effect on most of the measured traits. Water deficit stress significantly reduced yield and yield components of RGS canola variety. The most reduction was observed in plants under water deficit condition at reproductive stage. Use of micronutrients increased canola grain yield. The maximum grain yield was observed in plants that treated with iron sulfate 1 per thousand + manganese sulfate 1.5 per thousand. In general, low concentration levels of iron and manganese foliar application was more effective on plants for reduction harmful effect of water deficit levels than high micronutrient concentrations.