Produção de cultivares de palma forrageira sob níveis de salinidade da água e adubação orgânica.

Abstract

Irrigation promotes the rational exploitation of crops mainly in the semiarid region of the Brazilian northeast, however, the quantity and quality of the water available for irrigation in this region, presents great variability and in many localities only have saline waters for irrigation. The objective of this study was to evaluate the effect of different salinity levels of irrigation water associated with substrates composed of soil and increasing amounts of cattle manure under the production of two forage palm cultivars.The experiment was carried out in a protected environment "greenhouse" of the Center for Human and Agrarian Sciences of the State University of Paraíba (CHAS/ EUPB), located in the municipality of Catolé do Rocha - PB. A randomized block design was used in the factorial scheme 5 x 3 x 2, with three replications and one plant per plot. The treatments were the result of a combination of the following factors: electrical conductivity of irrigation water - ECw (1,2, 1,8, 2,4, 3,0 and 3,6 dS m-1), bovine manure (200.4, 1202 and 2204 g) and two forage palm cultivars, Opuntia ficcus-indica L popularly known as "giant palm" (OFI) and Opuntia tuna L. Mill, popularly known as "elephant ear-Mexican "(OT). The production of the palm cultivars is decreasing with the increase of CEw, however, irrigation with CEw water of up to 1.36 dS m-1, promotes acceptable reductions of 10% in the phytomass of the different cultivars. The manure dose of 200.4 g yielded the best results for the growth and phytomass production of Opuntia fícus-indica L. and Opuntia tuna L. palm cultivars.