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H IBISCUS sabdariffa L. (Roselle) isaherbal medicineplant that has severaluses, i.e. as a food or a flavouring agent in the food industry, and also in hot and cold beverages. It is a cash crop in arid and semi-arid zones. The experiment was conducted to study the effect of irrigation and compost applicationon Roselle in Rasheed, Egypt. Water supplyfrequency was divided into three different timingsin 2, 4 and 6 days intervals. In addition to mineral fertilizers, soil media were supported with compost as a soil amendment at 5, 10 and 15 t fed-1. The positive effect of irrigation and compost application was monitored on plant height, stem diameter, number of leaves, branches and fruits, dry weight of plantand calyx. Leaf chlorophyll contents and calyx anthocyanin composition were positively increased with the increase in interval and compost application.

This research study was carried out in the open field during the two successive seasons of 2012/2013 and 2013/2014. The aim of this investigation was to study the response of pot marigold (Calendula officinalis L.) to different application methods and concentrations of seaweed extracts applied as a commercial compound. Seven treatments were initiated, i.e. three concentrations of seaweed extracts (500, 1000, 1500) were used either as foliar spray or as soil drench in addition to the control treatment (tap water). Results indicated that foliar spray with 1500 ppm of seaweed extract increased significantly plant height, number of flowers per plant and vase life in the two tested seasons. However, foliar spray with the lowest concentration of seaweed extract (500 ppm) resulted in significant increments in flower stalk length, flower diameter and carbohydrates content. Moreover, the same concentration showed significant increases in total carotenoids, nitrogen, and phosphorus percentage when used as soil drench in the two tested seasons.

Populus is a fast growing tree that attract the attention of people. This genus provides environment protection due to their ability in carbon sequestration, phytoremediation and wildlife inhabitant. Populus species are widely used as a source of wood, veneer, paper and bioenergy. This survey study aimed to identify the current status of Populus species inhabiting four different governorates of the Egyptian territories. In this survey, four different locations were surveyed, i.e. Cairo, Giza, Qaliobia and Gharbia governorates. According to the site survey, five species of Populus were found. Research findings indicate that the length and diameter of the trees varied according to various species in various localities. Selected trees of various species were subjected to different morphological, chemical parameters and genetic assessments. P. deltoides from Giza in addition to P. deltoides and P. nigra from Cairo gave somewhat close relation in their vegetative parameters. Furthermore, both P. nigra and P. alba from Gharbia location gave high similarity due to overall vegetative parameters and also both P. euramericana female from the Gharbia and P. nigra from Qaliobia. Genetic diversity was analyzed using molecular markers. Three different Inter-simple sequence repeat (ISSR) primers were used for the reaction (17899A, 17899B and HB13). ISSR primers markers yielded 67.5% polymorphic loci among the surveyed species and cluster analysis enabled separation of these populations on the basis of their genetic distances. P. euramericana female and male from Giza showed close relation at morphological level. From this study it can be concluded that: firstly; leaf parameters i.e. leaf area width and length were suitable for identifying the differences among species, and secondly; genetic analysis using molecular markers was enough to discriminate between species. Our results finally suggest that Populus species possess genetic variation and can adapt to new environmental conditions, which in its self-valuable information would potentially lead to promising applications.