Doses de N e K aplicados via fertirrigação na cultura da roseira (Rosa sp.) em ambiente protegido. / Levels of n and k applied by fertigation on rose (rosa sp.) crop in a protected environment.

AUTOR(ES)

Edivaldo Casarini

DATA DE PUBLICAÇÃO

2004

RESUMO

The rose plant fertigation is a technique quite useful by flowers growers. The nitrogen and the potassium are the most required nutrients in the distinct crop phases, where the application of correct amounts increases the yield and flower quality. A study was carried out under protected environment conditions, at the experimental area of the Department of Rural Engineering of “Escola Superior de Agricultura Luiz de Queiroz”, Piracicaba, São Paulo State, Brazil, from November/2002 to September/2003. The aim of the experiment was to evaluate the yield and quality of rose flowers, “Versilha” cultivar. The treatments were disposed in combination of 4 N levels (10; 20; 30 and 40 g.pl-1.year-1) and 4 K levels (10; 20; 30 and 40 g.pl-1.year-1). The statistical test was performed in randomized blocks, with 3 replications, arranged in a 4 x 4 factorial design. Drip system irrigation was used with tensiometers and a reduced evaporation pan in order to manage water depth. The parameters evaluated were: stem and bud quality, yield, electric conductivity, NO3- and K+ soil solution levels by ion meter (HORIBA) and concentrations of macro and micronutrients in the leaves. Total irrigation water depth applied between February and September was 839,43 mm with an average of 3,46 mm.d-1 and the average soil matric potencial was -10 kPa in a 0 – 20 cm in depth. The two flushes rose yield was linearly reduced with the applied K levels. Stems quality showed no difference for majors evaluated parameters. The electric conductivity, NO3- and K+ soil solution levels linearly increased according to the levels of N and K. The N and P concentrations in the leaves were influenced by N levels. Ca2+ and Mg2+ concentrations in the leaves were influenced by K levels, showing antagonism between them. In micronutrients concentrations, boron showed an interaction, influenced by N and K levels and Fe2+ and Mn2+ influenced by N levels.

ASSUNTO(S)

fertigation rosa drip irrigation rose nitrogen fertilizers title fertirrigação potassium fertilizers fertilizantes nitrogenados protected environment fertilizantes potássicos irrigação por gotejamento ambiente protegido

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