Uso de prolina na produção de porta-enxerto de cajueiro sob irrigação com águas salinizadas.

Abstract

The scarcity of good quality water and the occurrence of long periods without rainfall are limiting factors for irrigated agriculture, mainly in semi-arid regions, which induce the use of salt water and the use of technologies that allow the use of these waters in the production agricultural. In this sense, the objective of this study was to evaluate the influence of foliar proline doses on the physiological, growth and quality responses of BRS 226 cashew rootstock irrigated with waters of different saline levels. The experiment was carried out in a protected environment of the Federal University of Campina Grande of the Agro-Food Science and Technology Center, Campus Pombal - PB, where a randomized block design was used in a 5 x 4 factorial scheme with three replications and two plants (0.3, 1.0, 1.7, 2.4 and 3.1 dS m-1) associated to the doses of proline applied via the irrigation water foliar - P (0, 4, 8 and 12 mmol L-1).Gaseous exchanges, growth and root quality are reduced by increasing ECa of irrigation water, however, irrigation with ECa water of up to 1.12 dS m-1, promotes acceptable reductions of 10% in morphophysiology of cashew BRS 226. Dose of 8 mmol L-1 of proline attenuated the negative effects of water salinity on the Dickson Quality Index and dried cashew root phytomass at 65 days after sowing. The increase in proline concentrations did not attenuate the effects of salinity on the physiology variables.