Manejo do nitrogênio na produção fora do solo de pontas de estolões de morangueiro

Abstract

The objective of this research was to determine the effect of N concentration in the nutrient solution on strawberry runner tips production and growth and on the strawberry stock plants growth, N uptake and accumulation in a system for plug plants production. The experiment was conducted between September 2010 and March 2011. Strawberry stock plants of cultivars Camino Real and Oso Grande were grown in a soiless system in polietylene bags with sand as substrate. N concentration of 5.12 (T1), 7.6 (T2), 10.12 (T3 control), 12.62 (T4) e 15.12 (T5) mmol L-1 was compared. The increase of N concentration from 5.12 to 15.12 mmol L-1 reduces growth of crown, roots and LAI of strawberry stock plants but did not affect emission and growth of runner tips. There is any increasing in N uptake and accumulation on strawberry stock plants up 7.62 mmol L-1 N in nutrient solution. Between organs, N accumulation decrease from leaflet, roots, petioles to crown. A hand-held chlorophyll meter shows good relation with N concentration in leaflets and can be used for monitoring N crop status. It was concluded that the N concentration in nutrient solution for commercial production of runner tips can be reduces to 5.12 mmol L-1.