Analysis of the electric conductivity and pH behaviors in recycled drainage solution of rose cv. Charlotte plants grown in substrate

Published

2013-09-01

Analysis of the electric conductivity and pH behaviors in recycled drainage solution of rose cv. Charlotte plants grown in substrate

Keywords:

soilless cropping, closed systems, nutrient recycling, organic substrates, cutting flowers. (es)

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Authors

Luis Fernando Yepes Vargas Department of Agriculture, EDL S.A. Bogota (Colombia).
Víctor J. Flórez R. Profesor Asociado, Facultad de Agronomía, Universidad Nacional de Colombia, sede Bogotá.

Abstract (es)

In open soilless cropping systems contamination from nutrient

lixiviation is generated making it necessary to design closed or

semi-closed systems, which require the determination of the

maximum saline levels in recycling solutions. In this study, the

electric conductivity (EC) and pH behaviors were analyzed in

drainage solution intended for recycling in the crop; in addi-

tion, parameters were used to estimate nutrient availability for

the plants in a substrate based cropping system. This research

project was carried out under greenhouse conditions in the mu-

nicipality of Mosquera (Colombia). Rose cv. Charlotte grafted

on ‘Natal briar’ stocks were used, sown in pots arranged on

elevated beds, 15 m in length. This project was carried out using

a split-plot design with sub-plots (with the substrate as the main

plot and the recycling as the sub-plot), three kinds of substrate

and three recycling percentages (0, 50, and 100%), for a total of

27 experimental units. Substrate mixtures based on burned rice

husk and coconut fiber were used. Recycling during one harvest

cycle of the roses did not show EC and pH values above those

that are considered to have a negative impact on production;

however, an increasing behavior in the EC and pH values was

observed. Likewise, no significant differences between the 50

and 100% recycling were observed, which means 100% recycling

can be used, optimizing nutrient use and water conservation.

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