Abstract
Abstract: The objective of this work was to evaluate the vegetative growth and yield of the 'Abate Fetel' and 'Rocha' pear (Pyrus communis) trees grafted onto the 'Adams', 'Ba29', and 'EMC' quince (Cydonia oblonga) rootstocks in the climatic conditions of Southern Brazil. The plants were trained on a central leader system, at a 4.0x1.0-m spacing. Vegetative growth, yield, and fruit size were evaluated. 'Rocha' showed greater vegetative growth, but also alternate bearing, mainly due to fructification problems. 'Abate Fetel' presented high flowering intensity, but a very low fructification, which limited its yield. Among rootstocks, 'Adams' induced a higher vigor during the initial stages and an increased intensity in flowering in the sixth year. In the following seasons, there was no rootstock effect on the assessed variables. 'Rocha' has a satisfactory production, whereas 'Abate Fetel' shows a weak vegetative growth and a very low production. The 'Adams', 'Ba29', and 'EMC' rootstocks induce similar vegetative and productive behavior in the 'Abate Fetel' and 'Rocha' pear trees.
Highlights
The low yield of orchards is one of the main factors that limit the expansion of pear (Pyrus spp.) tree crops in Southern Brazil
The objective of this work was to evaluate the vegetative growth and yield of the 'Abate Fetel' and 'Rocha' pear (Pyrus communis) trees grafted onto the 'Adams', 'Ba29', and 'EMC' quince (Cydonia oblonga) rootstocks in the climatic conditions of Southern Brazil
This low yield is attributed to a low fructification rate, related to aspects that influence pollination (Hawerroth & Petri, 2011; Luz et al, 2017), such as the cultivars used in different planting regions (Rufato et al, 2012) and the excessive vegetative growth of plants due to the use of vigorous rootstocks and to climatic conditions favorable for a longer growth period (Hawerroth & Petri, 2011; Rufato et al, 2012; Pasa et al, 2017)
Summary
The low yield of orchards is one of the main factors that limit the expansion of pear (Pyrus spp.) tree crops in Southern Brazil This low yield is attributed to a low fructification rate, related to aspects that influence pollination (Hawerroth & Petri, 2011; Luz et al, 2017), such as the cultivars used in different planting regions (Rufato et al, 2012) and the excessive vegetative growth of plants due to the use of vigorous rootstocks and to climatic conditions favorable for a longer growth period (Hawerroth & Petri, 2011; Rufato et al, 2012; Pasa et al, 2017). The incompatible plants had discontinuity of the vascular system at the grafting location, which prevented water and nutrient transport through the xylem, as well as the transport of photoassimilates through the phloem, causing reductions in vegetative growth and, in more severe cases, plant death (Darikova et al, 2011)
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