INSTITUTO DE FISIOLOGIA VEGETAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Sprout vigor of poplar cuttings from stoolbeds fertilized with nitrogen or phosphorus
FAUSTINO, LAURA; GRACIANO, CORINA; RODRIGUEZ, MARÍA EMILIA
Conferencia; The Fourth International Conference of the International Union of Forest Research Organizations Unit 2.09.02: Somatic Embryogenesis and Other Vegetative Propagation Technologies; 2016
IUFRO - UNLP, FCAyF - CIEFAP - NIFoS
Salicaceae (Populus and Salix) stoolbeds are high density plantations that produce propagating material (cuttings) for clonal plantations. With the annual shoot harvest, nutrients are exported from the system. 2-7 g N/m2 and 1 g P/m2 are extracted every year from the soil of the stoolbeds. Extraction is high compared with other forest systems, because the branches harvested are very young, so they contain high concentration of nutrients (high bark:wood). In successive cycles of production, soil fertility can be reduced. Fertilization enables to compensate for extraction of nutrients. However, there is little information if mineral fertilization affects the vigor of the cutting in its early sprout.When stoolbeds were fertilized with N or P the early vigour of the cutting of clone 150-82 was little affected.Some traits of the early vigour of clone Australiano 129/60 were negative affected by fertilization (less roots and shoots). However, growth was not reduced if plants were under well watered conditions 3 months after planting.Fertilization with N reduced wood density of the cuttings, reduced leaf production in the middle term and reduced the tolerance to drough of the new plants.Fertilization with P had no effect in wood density, number of leaves and drought tolerance, but slightly reduces tolerance to flooding.The effect of fertilization on the tolerance to drough and flooding should be taken into account if fertilization is adopted as a practice to increase the yield of the stoolbeds or to compensate nutrient extraction. Genotipic variablity should be considered.