Produção de porta-enxerto de cajueiro irrigado com águas salinizadas e adubação potássica.

Abstract

The formation of cashew rootstocks, in the semi-arid region of the Northeast, where the water is not always of good quality, depends on the use of techniques that enable the management of soil and water with high salt content. The objective of this study was to evaluate the production of common cashew nut biomass submitted to different levels of irrigation water salinity and potassium doses.The work was carried out in a protected environment (greenhouse) of the Federal University of Campina Grande at the Agro - Food Sciences and Technology Center, Pombal - PB campus, from May to August 2016.A randomized complete block design was used in a 5 x 4 factorial scheme, with four replications and two plants per plot. The treatments were composed of five levels of electrical conductivity of irrigation water (0,3; 1,3; 2,3; 3,3 and 4,4 dS m-1 ) and four doses of potassium (70, 100, 130 and 160% K) being the standard dose 100% K (150 mg of K dm-3of soil).Irrigation with ECw water of up to 2.62 dS m-1 promotes an acceptable reduction in the common cashew rootstock biomass of 10%. The dose of 105 mg of K dm-3of substrate (equivalent to 70% of the recommended dose) stimulates the accumulation of dry shoot and root fresh shoots of common cashew rootstocks.There was no significant interaction between salinity of irrigation water and potassium fertilization on the phytomasses evaluated in cashew rootstock.