Effect of irrigation and different Mulch on some vegetative and reproductive characteristics of starch (Zinnia elegans)

Zinnia flowers have many usages in landscaping but because of the recent drought the quality and quantity of the flowers have reduced. So, the aim of the current research is to evaluate the effects of different mulches and irrigation intervals on some of the vegetative and reproductive features of the plant (Zinnia Elegans). This experiment was accomplished in the factorial basis and in the form of random block plan in three replications. Factors include three levels of irrigation (3, 5, and 7 days) and four types of mulches (Dark polyethylene, transparent polyethylene, woodchips and mulch less). The thickest diameter of Zinnia related to the usage of woodchips and 3-day irrigation. Using the same mulch and different irrigation (5-day) was not considerably different. The highest Zinnia was seen when the woodchips and 3-day irrigation applied. The lowest height was in the absence of mulches and 5/7-day irrigation. The branches increased mostly when woodchips and 3-day irrigation applied. The usage of polyethylene and 3-day irrigation was not considerably different. The heaviest dry/wet root related to the usage of woodchips and 3-day irrigation. The dry and wet weight of the root reduced considerably in the absence of mulches and 5/7-day irrigation. The heaviest dry and wet shoot flowers using 3-day irrigation was more than other treatments. The most leaf was seen when the woodchips or transparent polyethylene were applied with the 3-day irrigation. The chlorophyll content increased mostly when woodchips was applied with the 7-day irrigation.