ISHS Acta Horticulturae 294: II Symposium on Horticultural Substrates and their Analysis, XXIII IHC
EFFECT OF HUMIC ACIDS ON GROWTH AND BIOMASS PARTITIONING OF CONTAINER-GROWN OLIVE PLANTS. |
| Authors: | M. Tattini, P. Bertoni, A. Landi, M.L. Traversi |
| Abstract:
One month old self-rooted olive (Olea europaea L., cv. Leccino) plants were grown, during a 120 day period, in 3.0 1 pot with artificial substrate (peat/sand 50/50 v/v) and fertigation. Five HA concentrations were tested, supplied directly via a drip irrigation system: 0 – 30 – 60 – 120 – 240 mg/pot/10 dd. Sixteen plants for each treatment were harvested, after 60 and 120 days of culture, for growth and nutrient uptake measures. Whole plant dry weight was largely increased by supplying HA in the range 30–120 mg/pot. HA affected root growth, significantly increasing the production of thin, lateral roots, while the effect on thick root growth was less evident. HA increased nitrogen uptake rate (per gram of fresh root weight) during the first 60 days of culture; a prolonged HA supply reduced N-uptake and relative growth rate when using concentrations 60 mg/pot/10 dd. Relevant effect on tissue nitrogen, phosphorus and magnesium contents were observed. | |
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