Growth analysis of potted gerbera grown in different substrates

Growth analysis of potted gerbera grown in different substrates Cultivation and commercialization of potted gerbera are recent issues and there is a great demand for adequate substrates for its production. This work aimed to evaluate the growth of two potted gerbera cultivars (Cherry and Red) grown in different substrates. The experiment was carried out in a greenhouse from September to November 2008 at Botucatu, Sao Paulo State, Brazil. Experimental design was randomized blocks in a 5x2 factorial arrangement (substrates x cultivars). Gerbera plants leaf area and dry phytomass were evaluated fortnightly (1, 15, 29 and 43 days after acclimation (DAA)). For the leaf area ratio (RAF), relative growth rate (TCR) and net assimilation rate (TAL), the total dry phytomass and leaf area were adjusted in relation to time using the ANACRES program. The gerbera plants had better development in substrate 4 (30% pinus bark, 30% C-1, 20% granulated coconut, 20% mixed coconut). The selection of substrates for the development of gerbera plants should consider primarily its physical and chemical attributes. For the studied cultivars, the substrate pH below 5.5 and above 7.0 was unsuitable for development as well as dry densities above 530 kg m-(3)