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Balsa (Ochroma pyamidale) is a fast growing, early successional, tropical tree species characterised by very low wood density, large leaves, rapid leaf turnover, narrow crown and short life cycle (15 to 20 years) (Vleut et al. 2013). Balsa is a lightdemanding species, and crown competition induces height growth; an increase in trunk diameter is promoted after attaining optimal height. Plants grown in infertile soils often have lower maximum growth rates and greater biomass allocation to roots than shoots compared with those grown in fertile soils (Grime 2002). Vincent and Tanner (2013) showed positive response of balsa seedlings with increase in P fertilisation from 5.8 to 50 kg ha-1 under shade house conditions. Balsa seedlings actually acquired more P than was quantified in the soil by inductively coupled plasm (ICP) after nitric acid digestion, suggesting that balsa has very high P-acquisition efficiency (Vincent & Tanner 2013). Rapid growth rates, strong root system and sufficiently rigid stem are major goals of nursery production (Shono et al. 2007). INFLUENCE OF PHOSPHORUS LIMITATIONS ON THE GROWTH, NUTRIENT PARTITIONING AND PHYSIOLOGY OF BALSA (OCHROMA PYRAMIDALE ) SEEDLINGS

Influence of phosphorus limitations on the growth, nutrient partitioning and physiology of balsa (Ochroma pyramidale) seedlings