Abstract

GONZALEZ, Marilú; JIMENEZ, Luis; YANEZ, Wilfrido  and  PARDUCCI, Paolo. Use of organic acids derivated from leonardite in rose crops under greenhouse conditions. Agron. Costarricense [online]. 2018, vol.42, n.1, pp.155-162. ISSN 0377-9424.  http://dx.doi.org/10.15517/rac.v42i1.32202.

Leonardite is an organic fertilizer that is becoming increasingly accepted among farmers because it contains high amounts of humic acids that promote crop production. The effect of the application of leonardite on vegetative and productive parameters of rose (Rosa sinensis cv. Freedom) under greenhouse conditions was evaluated. Three doses of organic acids derived from leonardite mineral were evaluated: low (10 g.bed-1), medium (15 g.bed-1) and high (20 g.bed-1), which were compared with the effect of an organic acid commonly used in the greenhouse (positive control) and with inorganic fertilization (negative control). Spraying was made at the beginning of the trial in an 18 m2 plot per treatment and the plants were evaluated weekly during five weeks. The results obtained showed that the plants treated with 15 g of leonardite.bed-1 showed higher shoot length, number of basal shoots and shoot productivity compared to the rest of treatments. However, it is suggested to carry out similar studies where it is evaluated over a longer period to determine how long the effect on productivity in rose growing under greenhouse conditions is maintained.

Keywords : Leonardite; humic acid; fulvic acid; basal shoots; productivity; roses.

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