Abstract
The objective of this study was to evaluate the reproductive, productive and physicochemical characteristics of fruits (fruit volume and soluble solids) of ‘Packham’s Triumph’ pear trees treated with different doses of phytoregulators. The experiment was carried out in the 2014/2015 and 2015/2016 cycles, using 1-naphthaleneacetic acid (NAA), 2-chloroethyl phosphonic acid (Etefon) and 6-Benzyladenine (BA) phytoregulators, each at doses of 200 and 300 ml L-1. The experimental design consisted of a randomized block with five replicates, where each experimental unit consisted of one plant. Significance was only found for soluble solids in the 2014/2015 harvest, observing that the highest mean was identified in plants treated with 300 ml L-1 Etefon, (15 °Brix), while the lowest soluble solids content was observed with the dose of 200 mg L-1 of NAA, (11 °Brix); in the 2015/2016 crop, the highest number of inflorescences of the year was identified in plants treated with 200 ml L-1 of Etefon, (1.66) and the lowest value for the treatment with 300 ml L-1 of BA, (0.17). Effective fruiting in the value of 58.33% was also observed and verified for the plants treated with 300 mg L-1 of NAA, differing from all except from 200 ml L-1 BA. Only the plant growth regulator, NAA, at the dose of 200 mg L-1 provides low content of soluble solids in the fruits and Etefon 300 mg L-1 provides high content of solids solubles. The lowest number of branch inflorescences of the year was in plants treated with 6-Benzyladenine at a dose of 300 ml L-1 and the highest at a dose of Etefon 200 mg L-1. The NAA dose of 300 mg L-1 and 6-Benzyladenine dose of 200 ml L-1 had greater effective fruiting, but not did not reflect on the production per plant and productive efficiency. There was no benefit observed in the return bloom with the application of phytoregulators. Besides, no benefits were observed in the return bloom with the application of phytoregulators.
Highlights
Due to its pleasant taste and nutritional value, the pear (Pyrus spp.) is one of the most popular fruits in the world (Simirgiotis et al, 2016)
In the cultivation of pear trees, some obstacles to the dissemination of cultivation and growth in area have been reported by several authors
The experiment consisted of seven treatments: plants without application, plants treated with 1-naphthaleneacetic acid (NAA) at doses of 200 and 300 mg L-1; 2-chloroethyl phosphonic acid (Etefon) at doses of 200 and 300 ml L-1 and 6-benzyladenine (BA) at doses of 200 and 300 ml L-1
Summary
Due to its pleasant taste and nutritional value, the pear (Pyrus spp.) is one of the most popular fruits in the world (Simirgiotis et al, 2016). For the success of any agricultural activity, it is paramount to know the physical environment factors that affect the physiological and phenological processes of plants (Morais et al, 2008). Temperature fluctuations, insufficiency of winter chill hours required by cultivars, water stress and nutritional stress, with emphasis on carbohydrates and micronutrients (Veríssimo et al, 2004) are among the main factors of the physical environment, besides disease, entomosporiosis (Nunes & Alves, 2012) and bacterial contamination (Pseudomonas sp.) (Rommel et al, 2010). In addition to the aforementioned factors, there are intrinsic issues of the plant such as vegetative vigor, type of rootstock, bud abortion, requirement in cold hours, lack of jas.ccsenet.org
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