Concentração de macronutrientes na solução nutritiva no cultivo de rabanete em hidroponia com substrato

Abstract

Vegetable cultivation in Brazil occurs conventionally by using the soil as a natural substrate. However, there is a steady growth in the use of hydroponic systems as a form of cultivation of these crops. For better development of vegetables in this system, it is important to pay attention to factors that affect the nutrient solution, which contains the available nutrients for crop growth. Among these factors, founds the concentration of nutrients, which varies according to the culture and weather conditions. Given this, this work aimed to evaluate the development of radish grown in a mixture of coconut fiber and rice husk, based on volume, in a ratio of 3:1, irrigated with a nutrient solution with different concentrations of macronutrients, based on the electric conductivity (EC) of the nutrient solution. For this, two experiments were conducted in a greenhouse at the Federal University of Ceara, in Fortaleza. The first experiment was performed using EC from 1.0 to 1.8 dS m-1, the second using EC from 2.0 to 2.8 dS m-1. The evaluated crop characteristics were leaf number (LN), leaf fresh matter (LFM), leaf dry matter (LDM), tuber fresh matter (TFM), tuber dry matter (TDM), cross-sectional diameter (CD), longitudinal diameter (LD), split tubers (ST) and commercial tubers (CT). The results show that the radish presented good tuber yield with EC of the nutrient solution from 1.6 to 1.8 dS m-1 and showed significant effects on other biometric characteristics of the crop.