Effect of a Biofertiliser on the Growth of Poinsettia

Abstract

The experiment was aimed to evaluate the effect of a biofertiliser containing the purple nonsulfur anoxygenic phototrophic bacterium Rhodobacter capsulatus (Ores, PSBIO System, Italy) on the growth of two poinsettia cultivars, 'Peterstar' and 'Maren', in comparison with the usual nitrogen fertigation. The plants were grown in a PMMA covered greenhouse, in 18 cm diameter pots filled with a peat based commercial substrate. Five treatments were compared: 1) the untreated control; 2) 120 mg N as NH 4 NO 3 per pot applied fortnightly from the pinching until the middle of November (in total 1320 mg N/pot); 3)-4)-5) biofertiliser Ores applied four times, the doses being 20 ml per pot of solution containing 0.75, 1.5 and 3 ml of the commercial product per litre of water, respectively. Before potting, the rootballs of the plants were immersed in the biofertiliser, then the biofertiliser was injected three more times at monthly intervals into different zones of the substrate. The experimental design was a split-plot, the cultivars being in plots and the treatments in sub-plots; there were three blocks and 8 replicates, with 240 plants total. Two weeks after potting, all the plants were pinched to eight nodes, and then fertilised every twenty days with a solution containing (mM) 1.5 P,

Effects of Different PGPR Formulations, Chemical Fertilizers and Their Combinations on Some Plant Growth Characteristics of Poinsettia

“…In terms of dry weight of plant, the effect of the applications was not significant (p>0.05) according to in 2 nd year and general averages of the data for the two years of the study (Table 2). Our study results related to the dry weight of plant increase are in harmony with of the results of researches studied by Kokalis-Burelle et al (2002) (for tomato and pepper seedling), Jaleel et al (2007) (for Madagascar periwinkle), Martinetti et al (2007) and Thapa (2017) (for poinsettia).…”

“…Jaleel et al (2007) demonstrated that Pseudomonas fluorescens has positive effects on fresh weight of Madagascar periwinkle (Catharanthus roseus). Our study results related to the fresh weight of plant increase are in harmony with of the results of researches studied by Jaleel et al (2007), Martinetti et al (2007) and Ge et al (2016). In the first year of the study, applications on the dry weight of plant were statistically significant at p<0.05 level.…”

Assessment of Different PGPR Formulations as a Biological Fertilizer in Cultivation of Poinsettia (&lt;i&gt;Euphorbia pulcherrima&lt;/i&gt;)

“…The above mentioned results are in harmony with those obtained by Jaleel et al [38] and Eid et al, [37]. Martinetti et al [39] reported that the plant weight ranged from 2.03 to 2.85 g. It can be said that dry weight of poinsettia plants increased in the present study when compared the results of study conducted by Martinetti et al [39].…”