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Ornamental Horticulture

On-line version ISSN 2447-536X

Abstract

STEGANI, Vanessa et al. Growth of fertigated desert rose in different nitrate/ammonium proportion. Ornam. Hortic. [online]. 2019, vol.25, n.1, pp.18-25.  Epub Apr 29, 2019. ISSN 2447-536X.  http://dx.doi.org/10.14295/oh.v25i1.1248.

This study aimed to determine NO3-/NH4+ proportion delivered by fertigation that allows greater desert rose plants growth in pots. Plants were cultivated in greenhouse in polypropylene pots, using a mixture of sand and composted Pinus powder (1:1, v v-1) as substrate. Experimental design was completely randomized, with six treatments (control, 0/100 25/75, 50/50, 75/25 and 100/0 of NO3– and NH4+ respectively), and ten replications. Fertigation was performed weekly in the amount of 100 mL per pot for 180 days. Variables evaluated were: shoot height, basal diameter of the caudice, number of branches, roots, leaves and caudice dry mass and macronutrient contents determination and accumulation in leaves, caudice and root. NO3– and NH4+ proportion promoted a greater change in nutrient content in leaves compared to caudice and roots. The proportion 25/75 NO3–/NH4+ is recommended for desert rose cultivation, as it provides the best results for most of the characteristics studied.

Keywords : Adenium obesum; nitrogen; nutrition; pot flower.

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