Abstract
The introduction of the cut rose culture in high temperature environment requires the use of technologies that allows its acclimation to the unusual environment. Products based on strobilurins, carboxamides and anilides as well as plant regulators that promote changes in the plant growth, can be a viable tool for the introduction of cut roses in the semiarid Northeast of Brazil. Thus, the objective of this study was to evaluate the effect of products with physiological effects on the growth of cut rose ‘Ambiance’ in the Submedium of the São Francisco Valley. The experimental design was a randomized block with four replicates and six treatments: control (water application); Boscalid; Pyraclostrobin; mixture of Boscalid + Pyraclostrobin; Fluxapyroxad + Pyraclostrobin; Kinetin + GA3 + IBA; and consisted of foliar applications every 15 days for 280 days. The growth evaluations were performed through physiological indexes assessment, chlorophyll content and production of flower buds per stem. The results obtained showed that, especially Boscalid, both isolated and combined with Pyraclostrobin, the Fluxapyroxad + Pyraclostrobin and the plant regulators provided better physiological responses on the growth of the rose ‘Ambiance’, considering the relative growth rate, net assimilation rate, leaf area ratio and specific leaf area. Although the average increase on production of flower buds per stem of all treatments applied in relation to the control was in the order of 135%, none of the treatments applied produced stem for cut roses with the required commercial standards, indicating that further studies are needed for an adequate introduction of the crop in Submedium of the São Francisco Valley.
Highlights
The floriculture business is an important segment within the intensive horticulture, becoming an important sector and it has been explored more intensively in the southern regions of Brazil (JUNQUEIRA and PEETZ, 2008)
The influence of pruning on rose bush is demonstrated in this index, since it stimulates the assimilative system for dry matter production, as can be observed when prunings occurred after 112, 168 and 224 days after transplant (DAT), with a decrease in relative growth rate (RGR) followed by rapid growth between pruning intervals
It was verified that plants treated with Fluxapyroxad + Pyraclostrobin, as well as those that received application of plant regulators, reached the maximum value for the RGR at 84 DAT, different behavior from the other treatments that reached at 56 DAT (Figure 1)
Summary
The floriculture business is an important segment within the intensive horticulture, becoming an important sector and it has been explored more intensively in the southern regions of Brazil (JUNQUEIRA and PEETZ, 2008). In order to produce cut roses in the semi-arid region, the foliar application of products of the chemical group of strobilurins, carboxamides and anilides, as well as plant regulators, emerges as a technology that can alter the plant physiology, favoring the establishment in an adverse climate environment. Molecules such as Pyraclostrobin, Fluxapyroxad and Boscalid, besides the fungicide action, have a positive effect on the yield of the crops in which they are applied, causing possible changes in metabolism and growth, providing higher productivity, greener leaves, greater chlorophyll accumulation and better development. Plant regulators act by modifying plant growth and development, influencing various physiological processes (PAROUSSI et al, 2002)
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