A strategy for the correction of boron deficiency in radiata pine plantations in New Zealand

Aplicación de boro en eucalipto: comparación de fuentes

“…Luego de 24 meses de la aplicación, las concentraciones foliares de los tratamientos fertilizados disminuyeron hasta valores que, aunque fueron levemente superiores, no se diferenciaron significativamente de los testigos, manteniéndose igualmente dentro del rango de suficiencia. Hunter et al (1990), trabajando en plantaciones de pino, encontraron que las concentraciones foliares de plantaciones fertilizadas con boratos de sodio mostraron un pico de concentración al año de la aplicación, con posterior caída en los sucesivos años. Las ulexitas molidas gruesas (2-5 mm), por el contrario, mostraron una residualidad de hasta al menos cuatro años post aplicación.…”

Effect of boron fertiliser, weed control and genotype on foliar nutrients and tree growth of juvenile Pinus radiata at two contrasting sites in New Zealand

“…It is of concern to forest managers because of the risk of leader tip dieback and the detrimental effect this has on tree form (Will, 1985;Dell and Malajczuk, 1994;Sutinen et al, 2006). B deficiencies in trees have been associated with both soil and climatic factors (Hunter et al, 1990;Stone, 1990). In New Zealand, B deficiency symptoms in Pinus radiata D. Don (radiata pine) often occur in coarse textured soils such as the pumice soils of the central North Island plateau and the Moutere gravel soils near Nelson (Will, 1985;Hunter et al, 1990).…”

“…B deficiencies in trees have been associated with both soil and climatic factors (Hunter et al, 1990;Stone, 1990). In New Zealand, B deficiency symptoms in Pinus radiata D. Don (radiata pine) often occur in coarse textured soils such as the pumice soils of the central North Island plateau and the Moutere gravel soils near Nelson (Will, 1985;Hunter et al, 1990). These soils are free draining and have lower clay and/or organic matter contents so their ability to retain soil moisture and adsorb B to prevent leaching is reduced (Hunter et al, 1990).…”

“…In New Zealand, B deficiency symptoms in Pinus radiata D. Don (radiata pine) often occur in coarse textured soils such as the pumice soils of the central North Island plateau and the Moutere gravel soils near Nelson (Will, 1985;Hunter et al, 1990). These soils are free draining and have lower clay and/or organic matter contents so their ability to retain soil moisture and adsorb B to prevent leaching is reduced (Hunter et al, 1990). Rainfall, particular during the www.elsevier.com/locate/foreco Available online at www.sciencedirect.com Forest Ecology and Management 255 (2008) [1196][1197][1198][1199][1200][1201][1202][1203][1204][1205][1206][1207][1208][1209] growing season, can have an important influence on foliar B concentrations.…”

“…An increase in the spring + summer rainfall is positively correlated with foliar B concentrations (Hopmans and Clerehan, 1991). B deficiencies in plantations can be exacerbated by water stress (Lambert and Ryan, 1990) and are worst in New Zealand during years of summer drought (Hunter et al, 1990) that mainly occur on the East Coast. However, B deficiency in plantations also occurs in high rainfall regimes, such as those on the South Island West Coast, New Zealand, where nutrients including B, are leached out the soil thereby limiting the plant availability (Will, unpublished).…”